diff options
Diffstat (limited to 'src/charts.c')
| -rw-r--r-- | src/charts.c | 1252 |
1 files changed, 1252 insertions, 0 deletions
diff --git a/src/charts.c b/src/charts.c new file mode 100644 index 0000000..4deb846 --- /dev/null +++ b/src/charts.c @@ -0,0 +1,1252 @@ +/* + * \/\/\ + * + * Copyright (C) 2012-2017 Vito Caputo - <vcaputo@gnugeneration.com> + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 3 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/* libvmon integration, warning: this gets a little crazy especially in the rendering. */ + +#include <X11/Xatom.h> +#include <X11/Xlib.h> +#include <X11/extensions/Xfixes.h> +#include <X11/extensions/Xrender.h> +#include <assert.h> +#include <math.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "charts.h" +#include "composite.h" +#include "libvmon/vmon.h" +#include "list.h" +#include "vwm.h" +#include "xwindow.h" + +#define CHART_MASK_DEPTH 8 /* XXX: 1 would save memory, but Xorg isn't good at it */ +#define CHART_FIXED_FONT "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1" +#define CHART_ROW_HEIGHT 15 /* this should always be larger than the font height */ +#define CHART_GRAPH_MIN_WIDTH 200 /* always create graphs at least this large */ +#define CHART_GRAPH_MIN_HEIGHT (4 * CHART_ROW_HEIGHT) +#define CHART_ISTHREAD_ARGV "~" /* use this string to mark threads in the argv field */ +#define CHART_NOCOMM_ARGV "#missed it!" /* use this string to substitute the command when missing in argv field */ +#define CHART_MAX_ARGC 512 /* this is a huge amount */ +#define CHART_VMON_PROC_WANTS (VMON_WANT_PROC_STAT | VMON_WANT_PROC_FOLLOW_CHILDREN | VMON_WANT_PROC_FOLLOW_THREADS) +#define CHART_VMON_SYS_WANTS (VMON_WANT_SYS_STAT) + +/* the global charts state, supplied to vwm_chart_create() which keeps a reference for future use. */ +typedef struct _vwm_charts_t { + vwm_xserver_t *xserver; /* xserver supplied to vwm_charts_init() */ + + /* libvmon */ + struct timeval maybe_sample, last_sample, this_sample; + typeof(((vmon_sys_stat_t *)0)->user) last_user_cpu; + typeof(((vmon_sys_stat_t *)0)->system) last_system_cpu; + unsigned long long last_total, this_total, total_delta; + unsigned long long last_idle, last_iowait, idle_delta, iowait_delta; + vmon_t vmon; + float prev_sampling_interval, sampling_interval; + int sampling_paused, contiguous_drops; + + /* X */ + XFontStruct *chart_font; + GC text_gc; + Picture shadow_fill, + text_fill, + bg_fill, + snowflakes_text_fill, + grapha_fill, + graphb_fill, + finish_fill; +} vwm_charts_t; + +/* everything needed by the per-window chart's context */ +typedef struct _vwm_chart_t { + vmon_proc_t *monitor; /* vmon process monitor handle */ + Pixmap text_pixmap; /* pixmap for charted text (kept around for XDrawText usage) */ + Picture text_picture; /* picture representation of text_pixmap */ + Picture shadow_picture; /* text shadow layer */ + Picture grapha_picture; /* graph A layer */ + Picture graphb_picture; /* graph B layer */ + Picture tmp_picture; /* 1 row worth of temporary picture space */ + Picture picture; /* chart picture derived from the pixmap, for render compositing */ + int width; /* current width of the chart */ + int height; /* current height of the chart */ + int visible_width; /* currently visible width of the chart */ + int visible_height; /* currently visible height of the chart */ + int phase; /* current position within the (horizontally scrolling) graphs */ + int heirarchy_end; /* row where the process heirarchy currently ends */ + int snowflakes_cnt; /* count of snowflaked rows (reset to zero to truncate snowflakes display) */ + int gen_last_composed; /* the last composed vmon generation */ + int redraw_needed; /* if a redraw is required (like when the window is resized...) */ +} vwm_chart_t; + +/* space we need for every process being monitored */ +typedef struct _vwm_perproc_ctxt_t { + typeof(((vmon_t *)0)->generation) generation; + typeof(((vmon_proc_stat_t *)0)->utime) last_utime; + typeof(((vmon_proc_stat_t *)0)->stime) last_stime; + typeof(((vmon_proc_stat_t *)0)->utime) utime_delta; + typeof(((vmon_proc_stat_t *)0)->stime) stime_delta; +} vwm_perproc_ctxt_t; + + +static float sampling_intervals[] = { + INFINITY, /* STOPPED */ + 1, /* ~1Hz */ + .1, /* ~10Hz */ + .05, /* ~20Hz */ + .025, /* ~40Hz */ + .01666}; /* ~60Hz */ + +static XRenderColor chart_visible_color = { 0xffff, 0xffff, 0xffff, 0xffff }, + chart_shadow_color = { 0x0000, 0x0000, 0x0000, 0x8800}, + chart_bg_color = { 0x0, 0x1000, 0x0, 0x9000}, + chart_div_color = { 0x2000, 0x3000, 0x2000, 0x9000}, + chart_snowflakes_visible_color = { 0xd000, 0xd000, 0xd000, 0x8000 }, + chart_trans_color = {0x00, 0x00, 0x00, 0x00}, + chart_grapha_color = { 0xff00, 0x0000, 0x0000, 0x3000 }, /* ~red */ + chart_graphb_color = { 0x0000, 0xffff, 0xffff, 0x3000 }; /* ~cyan */ +static XRenderPictureAttributes pa_repeat = { .repeat = 1 }; +static XRenderPictureAttributes pa_no_repeat = { .repeat = 0 }; + + +/* this callback gets invoked at sample time once "per sys" */ +static void sample_callback(vmon_t *vmon, void *arg) +{ + vwm_charts_t *charts = arg; + vmon_sys_stat_t *sys_stat = vmon->stores[VMON_STORE_SYS_STAT]; + + charts->this_total = sys_stat->user + sys_stat->nice + sys_stat->system + + sys_stat->idle + sys_stat->iowait + sys_stat->irq + + sys_stat->softirq + sys_stat->steal + sys_stat->guest; + + charts->total_delta = charts->this_total - charts->last_total; + charts->idle_delta = sys_stat->idle - charts->last_idle; + charts->iowait_delta = sys_stat->iowait - charts->last_iowait; +} + + +/* these callbacks are invoked by the vmon library when process instances become monitored/unmonitored */ +static void vmon_ctor_cb(vmon_t *vmon, vmon_proc_t *proc) +{ + VWM_TRACE("proc->pid=%i", proc->pid); + proc->foo = calloc(1, sizeof(vwm_perproc_ctxt_t)); +} + + +static void vmon_dtor_cb(vmon_t *vmon, vmon_proc_t *proc) +{ + VWM_TRACE("proc->pid=%i", proc->pid); + if (proc->foo) { + free(proc->foo); + proc->foo = NULL; + } +} + + +/* convenience helper for creating a pixmap */ +static Pixmap create_pixmap(vwm_charts_t *charts, unsigned width, unsigned height, unsigned depth) +{ + vwm_xserver_t *xserver = charts->xserver; + + return XCreatePixmap(xserver->display, XSERVER_XROOT(xserver), width, height, depth); +} + + +/* convenience helper for creating a picture, supply res_pixmap to keep a reference to the pixmap drawable. */ +static Picture create_picture(vwm_charts_t *charts, unsigned width, unsigned height, unsigned depth, unsigned long attr_mask, XRenderPictureAttributes *attr, Pixmap *res_pixmap) +{ + vwm_xserver_t *xserver = charts->xserver; + Pixmap pixmap; + Picture picture; + int format; + + /* FIXME this pixmap->picture dance seems silly, investigate further. TODO */ + switch (depth) { + case 8: + format = PictStandardA8; + break; + case 32: + format = PictStandardARGB32; + break; + default: + assert(0); + } + + pixmap = create_pixmap(charts, width, height, depth); + picture = XRenderCreatePicture(xserver->display, pixmap, XRenderFindStandardFormat(xserver->display, format), attr_mask, attr); + + if (res_pixmap) { + *res_pixmap = pixmap; + } else { + XFreePixmap(xserver->display, pixmap); + } + + return picture; +} + + +/* convenience helper for creating a filled picture, supply res_pixmap to keep a reference to the pixmap drawable. */ +static Picture create_picture_fill(vwm_charts_t *charts, unsigned width, unsigned height, unsigned depth, unsigned long attrs_mask, XRenderPictureAttributes *attrs, XRenderColor *color, Pixmap *res_pixmap) +{ + vwm_xserver_t *xserver = charts->xserver; + Picture picture; + + picture = create_picture(charts, width, height, depth, attrs_mask, attrs, res_pixmap); + XRenderFillRectangle(xserver->display, PictOpSrc, picture, color, 0, 0, width, height); + + return picture; +} + + +/* initialize charts system */ +vwm_charts_t * vwm_charts_create(vwm_xserver_t *xserver) +{ + vwm_charts_t *charts; + Pixmap bitmask; + + charts = calloc(1, sizeof(vwm_charts_t)); + if (!charts) { + VWM_PERROR("unable to allocate vwm_charts_t"); + goto _err; + } + + charts->xserver = xserver; + charts->prev_sampling_interval = charts->sampling_interval = 0.1f; /* default to 10Hz */ + + if (!vmon_init(&charts->vmon, VMON_FLAG_2PASS, CHART_VMON_SYS_WANTS, CHART_VMON_PROC_WANTS)) { + VWM_ERROR("unable to initialize libvmon"); + goto _err_charts; + } + + charts->vmon.proc_ctor_cb = vmon_ctor_cb; + charts->vmon.proc_dtor_cb = vmon_dtor_cb; + charts->vmon.sample_cb = sample_callback; + charts->vmon.sample_cb_arg = charts; + gettimeofday(&charts->this_sample, NULL); + + /* get all the text and graphics stuff setup for charts */ + charts->chart_font = XLoadQueryFont(xserver->display, CHART_FIXED_FONT); + if (!charts->chart_font) { + VWM_ERROR("unable to load chart font \"%s\"", CHART_FIXED_FONT); + goto _err_vmon; + } + + /* create a GC for rendering the text using Xlib into the text chart stencils */ + bitmask = create_pixmap(charts, 1, 1, CHART_MASK_DEPTH); + charts->text_gc = XCreateGC(xserver->display, bitmask, 0, NULL); + XSetForeground(xserver->display, charts->text_gc, WhitePixel(xserver->display, xserver->screen_num)); + XFreePixmap(xserver->display, bitmask); + + /* create some repeating source fill pictures for drawing through the text and graph stencils */ + charts->text_fill = create_picture_fill(charts, 1, 1, 32, CPRepeat, &pa_repeat, &chart_visible_color, NULL); + charts->shadow_fill = create_picture_fill(charts, 1, 1, 32, CPRepeat, &pa_repeat, &chart_shadow_color, NULL); + + charts->bg_fill = create_picture(charts, 1, CHART_ROW_HEIGHT, 32, CPRepeat, &pa_repeat, NULL); + XRenderFillRectangle(xserver->display, PictOpSrc, charts->bg_fill, &chart_bg_color, 0, 0, 1, CHART_ROW_HEIGHT); + XRenderFillRectangle(xserver->display, PictOpSrc, charts->bg_fill, &chart_div_color, 0, CHART_ROW_HEIGHT - 1, 1, 1); + + charts->snowflakes_text_fill = create_picture_fill(charts, 1, 1, 32, CPRepeat, &pa_repeat, &chart_snowflakes_visible_color, NULL); + charts->grapha_fill = create_picture_fill(charts, 1, 1, 32, CPRepeat, &pa_repeat, &chart_grapha_color, NULL); + charts->graphb_fill = create_picture_fill(charts, 1, 1, 32, CPRepeat, &pa_repeat, &chart_graphb_color, NULL); + + charts->finish_fill = create_picture(charts, 1, 2, 32, CPRepeat, &pa_repeat, NULL); + XRenderFillRectangle(xserver->display, PictOpSrc, charts->finish_fill, &chart_visible_color, 0, 0, 1, 1); + XRenderFillRectangle(xserver->display, PictOpSrc, charts->finish_fill, &chart_trans_color, 0, 1, 1, 1); + + return charts; + +_err_vmon: + vmon_destroy(&charts->vmon); + +_err_charts: + free(charts); + +_err: + return NULL; +} + + +/* teardown charts system */ +void vwm_charts_destroy(vwm_charts_t *charts) +{ + /* TODO: free rest of stuff.. */ + free(charts); +} + + +/* copies a row from src to dest */ +static void copy_row(vwm_charts_t *charts, vwm_chart_t *chart, int src_row, Picture src, int dest_row, Picture dest) +{ + XRenderComposite(charts->xserver->display, PictOpSrc, src, None, dest, + 0, src_row * CHART_ROW_HEIGHT, /* src */ + 0, 0, /* mask */ + 0, dest_row * CHART_ROW_HEIGHT, /* dest */ + chart->width, CHART_ROW_HEIGHT); /* dimensions */ +} + + +/* fills a row with the specified color */ +static void fill_row(vwm_charts_t *charts, vwm_chart_t *chart, int row, Picture pic, XRenderColor *color) +{ + XRenderFillRectangle(charts->xserver->display, PictOpSrc, pic, color, + 0, row * CHART_ROW_HEIGHT, /* dest */ + chart->width, CHART_ROW_HEIGHT); /* dimensions */ +} + + +/* copy what's below a given row up the specified amount within the same picture */ +static void shift_below_row_up(vwm_charts_t *charts, vwm_chart_t *chart, int row, Picture pic, int rows) +{ + vwm_xserver_t *xserver = charts->xserver; + + XRenderChangePicture(xserver->display, pic, CPRepeat, &pa_no_repeat); + XRenderComposite(xserver->display, PictOpSrc, pic, None, pic, + 0, (rows + row) * CHART_ROW_HEIGHT, /* src */ + 0, 0, /* mask */ + 0, row * CHART_ROW_HEIGHT, /* dest */ + chart->width, (rows + chart->heirarchy_end) * CHART_ROW_HEIGHT - (rows + row) * CHART_ROW_HEIGHT); /* dimensions */ + XRenderChangePicture(xserver->display, pic, CPRepeat, &pa_repeat); +} + + +/* moves what's below a given row up above it if specified, the row becoming discarded */ +static void snowflake_row(vwm_charts_t *charts, vwm_chart_t *chart, Picture pic, int copy, int row) +{ + VWM_TRACE("pid=%i chart=%p row=%i copy=%i heirarhcy_end=%i", chart->monitor->pid, chart, row, copy, chart->heirarchy_end); + + if (copy) + copy_row(charts, chart, row, pic, 0, chart->tmp_picture); + + shift_below_row_up(charts, chart, row, pic, 1); + + if (copy) { + copy_row(charts, chart, 0, chart->tmp_picture, chart->heirarchy_end, pic); + } else { + fill_row(charts, chart, chart->heirarchy_end, pic, &chart_trans_color); + } +} + +/* XXX TODO libvmon automagic children following races with explicit X client pid monitoring with different outcomes, it should be irrelevant which wins, + * currently the only visible difference is the snowflakes gap (heirarchy_end) varies, which is why I haven't bothered to fix it, I barely even notice. + */ + + +static void shift_below_row_down(vwm_charts_t *charts, vwm_chart_t *chart, int row, Picture pic, int rows) +{ + XRenderComposite(charts->xserver->display, PictOpSrc, pic, None, pic, + 0, row * CHART_ROW_HEIGHT, /* src */ + 0, 0, /* mask */ + 0, (row + rows) * CHART_ROW_HEIGHT, /* dest */ + chart->width, chart->height - (rows + row) * CHART_ROW_HEIGHT); /* dimensions */ +} + + +/* shifts what's below a given row down a row, and clears the row, preparing it for populating */ +static void allocate_row(vwm_charts_t *charts, vwm_chart_t *chart, Picture pic, int row) +{ + VWM_TRACE("pid=%i chart=%p row=%i", chart->monitor->pid, chart, row); + + shift_below_row_down(charts, chart, row, pic, 1); + fill_row(charts, chart, row, pic, &chart_trans_color); +} + + +/* shadow a row from the text layer in the shadow layer */ +static void shadow_row(vwm_charts_t *charts, vwm_chart_t *chart, int row) +{ + vwm_xserver_t *xserver = charts->xserver; + + /* the current technique for creating the shadow is to simply render the text at +1/-1 pixel offsets on both axis in translucent black */ + XRenderComposite(xserver->display, PictOpSrc, charts->shadow_fill, chart->text_picture, chart->shadow_picture, + 0, 0, + -1, row * CHART_ROW_HEIGHT, + 0, row * CHART_ROW_HEIGHT, + chart->visible_width, CHART_ROW_HEIGHT); + + XRenderComposite(xserver->display, PictOpOver, charts->shadow_fill, chart->text_picture, chart->shadow_picture, + 0, 0, + 0, -1 + row * CHART_ROW_HEIGHT, + 0, row * CHART_ROW_HEIGHT, + chart->visible_width, CHART_ROW_HEIGHT); + + XRenderComposite(xserver->display, PictOpOver, charts->shadow_fill, chart->text_picture, chart->shadow_picture, + 0, 0, + 1, row * CHART_ROW_HEIGHT, + 0, row * CHART_ROW_HEIGHT, + chart->visible_width, CHART_ROW_HEIGHT); + + XRenderComposite(xserver->display, PictOpOver, charts->shadow_fill, chart->text_picture, chart->shadow_picture, + 0, 0, + 0, 1 + row * CHART_ROW_HEIGHT, + 0, row * CHART_ROW_HEIGHT, + chart->visible_width, CHART_ROW_HEIGHT); +} + + +/* simple helper to map the vmon per-proc argv array into an XTextItem array, deals with threads vs. processes and the possibility of the comm field not getting read in before the process exited... */ +static void argv2xtext(vmon_proc_t *proc, XTextItem *items, int max_items, int *nr_items) +{ + int i; + int nr = 0; + + if (proc->is_thread) { /* stick the thread marker at the start of threads */ + items[0].nchars = sizeof(CHART_ISTHREAD_ARGV) - 1; + items[0].chars = CHART_ISTHREAD_ARGV; + items[0].delta = 4; + items[0].font = None; + nr++; + } + + if (((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->comm.len) { + items[nr].nchars = ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->comm.len - 1; + items[nr].chars = ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->comm.array; + } else { + /* sometimes a process is so ephemeral we don't manage to sample its comm, XXX TODO: we always have a pid, stringify it? */ + items[nr].nchars = sizeof(CHART_NOCOMM_ARGV) - 1; + items[nr].chars = CHART_NOCOMM_ARGV; + } + items[nr].delta = 4; + items[nr].font = None; + nr++; + + for (i = 1; nr < max_items && i < ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->argc; nr++, i++) { + items[nr].chars = ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->argv[i]; + items[nr].nchars = strlen(((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->argv[i]); /* TODO: libvmon should inform us of the length */ + items[nr].delta = 4; + items[nr].font = None; + } + + (*nr_items) = nr; +} + + +/* helper for counting number of existing descendants subtrees */ +static int count_rows(vmon_proc_t *proc) +{ + int count = 1; /* XXX maybe suppress proc->is_new? */ + vmon_proc_t *child; + + if (!proc->is_thread) { + list_for_each_entry(child, &proc->threads, threads) + count += count_rows(child); + } + + list_for_each_entry(child, &proc->children, siblings) + count += count_rows(child); + + return count; +} + + +/* helper for detecting if any children/threads in the process heirarchy rooted @ proc are new/stale this sample */ +static int proc_heirarchy_changed(vmon_proc_t *proc) +{ + vmon_proc_t *child; + + if (proc->children_changed || proc->threads_changed) + return 1; + + if (!proc->is_thread) { + list_for_each_entry(child, &proc->threads, threads) { + if (proc_heirarchy_changed(child)) + return 1; + } + } + + list_for_each_entry(child, &proc->children, siblings) { + if (proc_heirarchy_changed(child)) + return 1; + } + + return 0; +} + + +/* helper for drawing the vertical bars in the graph layers */ +static void draw_bars(vwm_charts_t *charts, vwm_chart_t *chart, int row, double a_fraction, double a_total, double b_fraction, double b_total) +{ + vwm_xserver_t *xserver = charts->xserver; + int a_height, b_height; + + /* compute the bar heights for this sample */ + a_height = (a_fraction / a_total * (double)(CHART_ROW_HEIGHT - 1)); /* give up 1 pixel for the div */ + b_height = (b_fraction / b_total * (double)(CHART_ROW_HEIGHT - 1)); + + /* round up to 1 pixel when the scaled result is a fraction less than 1, + * I want to at least see 1 pixel blips for the slightest cpu utilization */ + if (a_fraction && !a_height) + a_height = 1; + + if (b_fraction && !b_height) + b_height = 1; + + /* draw the two bars for this sample at the current phase in the graphs, note the first is ceiling-based, second floor-based */ + XRenderFillRectangle(xserver->display, PictOpSrc, chart->grapha_picture, &chart_visible_color, + chart->phase, row * CHART_ROW_HEIGHT, /* dst x, y */ + 1, a_height); /* dst w, h */ + XRenderFillRectangle(xserver->display, PictOpSrc, chart->graphb_picture, &chart_visible_color, + chart->phase, row * CHART_ROW_HEIGHT + (CHART_ROW_HEIGHT - b_height) - 1, /* dst x, y */ + 1, b_height); /* dst w, h */ +} + + +/* helper for marking a finish line at the current phase for the specified row */ +static void mark_finish(vwm_charts_t *charts, vwm_chart_t *chart, int row) +{ + vwm_xserver_t *xserver = charts->xserver; + + XRenderComposite(xserver->display, PictOpSrc, charts->finish_fill, None, chart->grapha_picture, + 0, 0, /* src x, y */ + 0, 0, /* mask x, y */ + chart->phase, row * CHART_ROW_HEIGHT, /* dst x, y */ + 1, CHART_ROW_HEIGHT - 1); + XRenderComposite(xserver->display, PictOpSrc, charts->finish_fill, None, chart->graphb_picture, + 0, 0, /* src x, y */ + 0, 0, /* mask x, y */ + chart->phase, row * CHART_ROW_HEIGHT, /* dst x, y */ + 1, CHART_ROW_HEIGHT - 1); +} + + +/* helper for drawing a proc's argv @ specified x offset and row on the chart */ +static void print_argv(vwm_charts_t *charts, vwm_chart_t *chart, int x, int row, vmon_proc_t *proc) +{ + vwm_xserver_t *xserver = charts->xserver; + XTextItem items[CHART_MAX_ARGC]; + int nr_items; + + argv2xtext(proc, items, NELEMS(items), &nr_items); + XDrawText(xserver->display, chart->text_pixmap, charts->text_gc, + x, (row + 1) * CHART_ROW_HEIGHT - 3, /* dst x, y */ + items, nr_items); +} + + +/* draws proc in a row of the process heirarchy */ +static void draw_heirarchy_row(vwm_charts_t *charts, vwm_chart_t *chart, vmon_proc_t *proc, int depth, int row, int heirarchy_changed) +{ + vwm_xserver_t *xserver = charts->xserver; + vmon_proc_stat_t *proc_stat = proc->stores[VMON_STORE_PROC_STAT]; + vmon_proc_t *child; + char str[256]; + int str_len, str_width; + +/* process heirarchy text and accompanying per-process details like wchan/pid/state... */ + + /* skip if obviously unnecessary (this can be further improved, but this makes a big difference as-is) */ + if (!chart->redraw_needed && + !heirarchy_changed && + !BITTEST(proc_stat->changed, VMON_PROC_STAT_WCHAN) && + !BITTEST(proc_stat->changed, VMON_PROC_STAT_PID) && + !BITTEST(proc_stat->changed, VMON_PROC_STAT_STATE) && + !BITTEST(proc_stat->changed, VMON_PROC_STAT_ARGV)) + return; + + /* TODO: make the columns interactively configurable @ runtime */ + if (!proc->is_new) + /* XXX for now always clear the row, this should be capable of being optimized in the future (if the datums driving the text haven't changed...) */ + XRenderFillRectangle(xserver->display, PictOpSrc, chart->text_picture, &chart_trans_color, + 0, row * CHART_ROW_HEIGHT, /* dst x, y */ + chart->width, CHART_ROW_HEIGHT); /* dst w, h */ + + /* put the process' wchan, state, and PID columns @ the far right */ + if (proc->is_thread || list_empty(&proc->threads)) { /* only threads or non-threaded processes include the wchan and state */ + snprintf(str, sizeof(str), " %.*s %5i %c %n", + proc_stat->wchan.len, + proc_stat->wchan.len == 1 && proc_stat->wchan.array[0] == '0' ? "-" : proc_stat->wchan.array, + proc->pid, + proc_stat->state, + &str_len); + } else { /* we're a process having threads, suppress the wchan and state, as they will be displayed for the thread of same pid */ + snprintf(str, sizeof(str), " %5i %n", proc->pid, &str_len); + } + str_width = XTextWidth(charts->chart_font, str, str_len); + + /* the process' comm label indented according to depth, followed with their respective argv's */ + print_argv(charts, chart, depth * (CHART_ROW_HEIGHT / 2), row, proc); + + /* ensure the area for the rest of the stuff is cleared, we don't put much text into thread rows so skip it for those. */ + if (!proc->is_thread) + XRenderFillRectangle(xserver->display, PictOpSrc, chart->text_picture, &chart_trans_color, + chart->visible_width - str_width, row * CHART_ROW_HEIGHT, /* dst x,y */ + chart->width - (chart->visible_width - str_width), CHART_ROW_HEIGHT); /* dst w,h */ + + XDrawString(xserver->display, chart->text_pixmap, charts->text_gc, + chart->visible_width - str_width, (row + 1) * CHART_ROW_HEIGHT - 3, /* dst x, y */ + str, str_len); + + /* only if this process isn't the root process @ the window shall we consider all relational drawing conditions */ + if (proc != chart->monitor) { + vmon_proc_t *ancestor, *sibling, *last_sibling = NULL; + struct list_head *rem; + int needs_tee = 0; + int bar_x = 0, bar_y = (row + 1) * CHART_ROW_HEIGHT; + int sub; + + /* XXX: everything done in this code block only dirties _this_ process' row in the rendered chart output */ + + /* walk up the ancestors until reaching chart->monitor, any ancestors we encounter which have more siblings we draw a vertical bar for */ + /* this draws the |'s in something like: | | | | comm */ + for (sub = 1, ancestor = proc->parent; ancestor && ancestor != chart->monitor; ancestor = ancestor->parent) { + sub++; + bar_x = (depth - sub) * (CHART_ROW_HEIGHT / 2) + 4; + + /* determine if the ancestor has remaining siblings which are not stale, if so, draw a connecting bar at its depth */ + for (rem = ancestor->siblings.next; rem != &ancestor->parent->children; rem = rem->next) { + if (!(list_entry(rem, vmon_proc_t, siblings)->is_stale)) { + XDrawLine(xserver->display, chart->text_pixmap, charts->text_gc, + bar_x, bar_y - CHART_ROW_HEIGHT, /* dst x1, y1 */ + bar_x, bar_y); /* dst x2, y2 (vertical line) */ + break; /* stop looking for more siblings at this ancestor when we find one that isn't stale */ + } + } + } + + /* determine if _any_ of our siblings have children requiring us to draw a tee immediately before our comm string. + * The only sibling which doesn't cause this to happen is the last one in the children list, if it has children it has no impact on its remaining + * siblings, as there are none. + * + * This draws the + in something like: | | | | +comm + */ + + /* find the last sibling (this has to be done due to the potential for stale siblings at the tail, and we'd rather not repeatedly check for it) */ + list_for_each_entry(sibling, &proc->parent->children, siblings) { + if (!sibling->is_stale) + last_sibling = sibling; + } + + /* now look for siblings with non-stale children to determine if a tee is needed, ignoring the last sibling */ + list_for_each_entry(sibling, &proc->parent->children, siblings) { + /* skip stale siblings, they aren't interesting as they're invisible, and the last sibling has no bearing on wether we tee or not. */ + if (sibling->is_stale || sibling == last_sibling) + continue; + + /* if any of the other siblings have children which are not stale, put a tee in front of our name, but ignore stale children */ + list_for_each_entry(child, &sibling->children, siblings) { + if (!child->is_stale) { + needs_tee = 1; + break; + } + } + + /* if we still don't think we need a tee, check if there are threads */ + if (!needs_tee) { + list_for_each_entry(child, &sibling->threads, threads) { + if (!child->is_stale) { + needs_tee = 1; + break; + } + } + } + + /* found a tee is necessary, all that's left is to determine if the tee is a corner and draw it accordingly, stopping the search. */ + if (needs_tee) { + bar_x = (depth - 1) * (CHART_ROW_HEIGHT / 2) + 4; + + /* if we're the last sibling, corner the tee by shortening the vbar */ + if (proc == last_sibling) { + XDrawLine(xserver->display, chart->text_pixmap, charts->text_gc, + bar_x, bar_y - CHART_ROW_HEIGHT, /* dst x1, y1 */ + bar_x, bar_y - 4); /* dst x2, y2 (vertical bar) */ + } else { + XDrawLine(xserver->display, chart->text_pixmap, charts->text_gc, + bar_x, bar_y - CHART_ROW_HEIGHT, /* dst x1, y1 */ + bar_x, bar_y); /* dst x2, y2 (vertical bar) */ + } + + XDrawLine(xserver->display, chart->text_pixmap, charts->text_gc, + bar_x, bar_y - 4, /* dst x1, y1 */ + bar_x + 2, bar_y - 4); /* dst x2, y2 (horizontal bar) */ + + /* terminate the outer sibling loop upon drawing the tee... */ + break; + } + } + } + + shadow_row(charts, chart, row); +} + + +/* recursive draw function for "rest" of chart: the per-process rows (heirarchy, argv, state, wchan, pid...) */ +static void draw_chart_rest(vwm_charts_t *charts, vwm_chart_t *chart, vmon_proc_t *proc, int *depth, int *row, int heirarchy_changed) +{ + vmon_proc_stat_t *proc_stat = proc->stores[VMON_STORE_PROC_STAT]; + vwm_perproc_ctxt_t *proc_ctxt = proc->foo; + vmon_proc_t *child; + double utime_delta, stime_delta; + + /* Some parts of this we must do on every sample to maintain coherence in the graphs, since they're incrementally kept + * in sync with the process heirarchy, allocating and shifting the rows as processes are created and destroyed. Everything + * else we should be able to skip doing unless chart.redraw_needed or their contents changed. + */ + + if (proc->is_stale) { + /* what to do when a process (subtree) has gone away */ + static int in_stale = 0; + int in_stale_entrypoint = 0; + + /* I snowflake the stale processes from the leaves up for a more intuitive snowflake order... + * (I expect the command at the root of the subtree to appear at the top of the snowflakes...) */ + /* This does require that I do a separate forward recursion to determine the number of rows + * so I can correctly snowflake in reverse */ + if (!in_stale) { + VWM_TRACE("entered stale at chart=%p depth=%i row=%i", chart, *depth, *row); + in_stale_entrypoint = in_stale = 1; + (*row) += count_rows(proc) - 1; + } + + (*depth)++; + list_for_each_entry_prev(child, &proc->children, siblings) { + draw_chart_rest(charts, chart, child, depth, row, heirarchy_changed); + (*row)--; + } + + if (!proc->is_thread) { + list_for_each_entry_prev(child, &proc->threads, threads) { + draw_chart_rest(charts, chart, child, depth, row, heirarchy_changed); + (*row)--; + } + } + (*depth)--; + + VWM_TRACE("%i (%.*s) is stale @ depth %i row %i is_thread=%i", proc->pid, + ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->comm.len - 1, + ((vmon_proc_stat_t *)proc->stores[VMON_STORE_PROC_STAT])->comm.array, + (*depth), (*row), proc->is_thread); + + mark_finish(charts, chart, (*row)); + + /* extract the row from the various layers */ + snowflake_row(charts, chart, chart->grapha_picture, 1, (*row)); + snowflake_row(charts, chart, chart->graphb_picture, 1, (*row)); + snowflake_row(charts, chart, chart->text_picture, 0, (*row)); + snowflake_row(charts, chart, chart->shadow_picture, 0, (*row)); + chart->snowflakes_cnt++; + + /* stamp the name (and whatever else we include) into chart.text_picture */ + print_argv(charts, chart, 5, chart->heirarchy_end, proc); + shadow_row(charts, chart, chart->heirarchy_end); + + chart->heirarchy_end--; + + if (in_stale_entrypoint) { + VWM_TRACE("exited stale at chart=%p depth=%i row=%i", chart, *depth, *row); + in_stale = 0; + } + + return; + } else if (proc->is_new) { + /* what to do when a process has been introduced */ + VWM_TRACE("%i is new", proc->pid); + + allocate_row(charts, chart, chart->grapha_picture, (*row)); + allocate_row(charts, chart, chart->graphb_picture, (*row)); + allocate_row(charts, chart, chart->text_picture, (*row)); + allocate_row(charts, chart, chart->shadow_picture, (*row)); + + chart->heirarchy_end++; + } + +/* CPU utilization graphs */ + /* use the generation number to avoid recomputing this stuff for callbacks recurring on the same process in the same sample */ + if (proc_ctxt->generation != charts->vmon.generation) { + proc_ctxt->stime_delta = proc_stat->stime - proc_ctxt->last_stime; + proc_ctxt->utime_delta = proc_stat->utime - proc_ctxt->last_utime; + proc_ctxt->last_utime = proc_stat->utime; + proc_ctxt->last_stime = proc_stat->stime; + + proc_ctxt->generation = charts->vmon.generation; + } + + if (proc->is_new) { + /* we need a minimum of two samples before we can compute a delta to plot, + * so we suppress that and instead mark the start of monitoring with an impossible 100% of both graph contexts, a starting line. */ + stime_delta = utime_delta = charts->total_delta; + } else { + stime_delta = proc_ctxt->stime_delta; + utime_delta = proc_ctxt->utime_delta; + } + + draw_bars(charts, chart, *row, stime_delta, charts->total_delta, utime_delta, charts->total_delta); + + draw_heirarchy_row(charts, chart, proc, *depth, *row, heirarchy_changed); + + (*row)++; + + /* recur any threads first, then any children processes */ + (*depth)++; + if (!proc->is_thread) { /* XXX: the threads member serves as the list head only when not a thread */ + list_for_each_entry(child, &proc->threads, threads) { + draw_chart_rest(charts, chart, child, depth, row, heirarchy_changed); + } + } + + list_for_each_entry(child, &proc->children, siblings) { + draw_chart_rest(charts, chart, child, depth, row, heirarchy_changed); + } + (*depth)--; +} + + +/* recursive draw function entrypoint, draws the IOWait/Idle/HZ row, then enters draw_chart_rest() */ +static void draw_chart(vwm_charts_t *charts, vwm_chart_t *chart, vmon_proc_t *proc, int *depth, int *row) +{ + vwm_xserver_t *xserver = charts->xserver; + int heirarchy_changed = 0; + int str_len, str_width; + char str[256]; + +/* CPU utilization graphs */ + /* IOWait and Idle % @ row 0 */ + draw_bars(charts, chart, *row, charts->iowait_delta, charts->total_delta, charts->idle_delta, charts->total_delta); + + /* only draw the \/\/\ and HZ if necessary */ + if (chart->redraw_needed || charts->prev_sampling_interval != charts->sampling_interval) { + snprintf(str, sizeof(str), "\\/\\/\\ %2iHz %n", (int)(charts->sampling_interval == INFINITY ? 0 : 1 / charts->sampling_interval), &str_len); + XRenderFillRectangle(xserver->display, PictOpSrc, chart->text_picture, &chart_trans_color, + 0, 0, /* dst x, y */ + chart->visible_width, CHART_ROW_HEIGHT); /* dst w, h */ + str_width = XTextWidth(charts->chart_font, str, str_len); + XDrawString(xserver->display, chart->text_pixmap, charts->text_gc, + chart->visible_width - str_width, CHART_ROW_HEIGHT - 3, /* dst x, y */ + str, str_len); + shadow_row(charts, chart, 0); + } + (*row)++; + + if (!chart->redraw_needed) + heirarchy_changed = proc_heirarchy_changed(proc); + + + draw_chart_rest(charts, chart, proc, depth, row, heirarchy_changed); + + chart->redraw_needed = 0; + + return; +} + + +/* consolidated version of chart text and graph rendering, makes snowflakes integration cleaner, this always gets called regardless of the charts mode */ +static void maintain_chart(vwm_charts_t *charts, vwm_chart_t *chart) +{ + vwm_xserver_t *xserver = charts->xserver; + int row = 0, depth = 0; + + if (!chart->monitor || !chart->monitor->stores[VMON_STORE_PROC_STAT]) + return; + + /* TODO: + * A side effect of responding to window resizes in this function is there's a latency proportional to the current sample_interval. + * Something to fix is to resize the charts when the window resizes. + * However, simply resizing the charts is insufficient. Their contents need to be redrawn in the new dimensions, this is where it + * gets annoying. The current maintain/draw_chart makes assumptions about being run from the periodic vmon per-process callback. + * There needs to be a redraw mode added where draw_chart is just reconstructing the current state, which requires that we suppress + * the phase advance and in maintain_chart() and just enter draw_chart() to redraw everything for the same generation. + * So this probably requires some tweaking of draw_chart() as well as maintain_chart(). I want to be able tocall mainta_charts() + * from anywhere, and have it detect if it's being called on the same generation or if the generation has advanced. + * For now, the monitors will just be a little latent in window resizes which is pretty harmless artifact. + */ + + chart->phase += (chart->width - 1); /* simply change this to .phase++ to scroll the other direction */ + chart->phase %= chart->width; + XRenderFillRectangle(xserver->display, PictOpSrc, chart->grapha_picture, &chart_trans_color, chart->phase, 0, 1, chart->height); + XRenderFillRectangle(xserver->display, PictOpSrc, chart->graphb_picture, &chart_trans_color, chart->phase, 0, 1, chart->height); + + /* recursively draw the monitored processes to the chart */ + draw_chart(charts, chart, chart->monitor, &depth, &row); +} + + +/* this callback gets invoked at sample time for every process we've explicitly monitored (not autofollowed children/threads) + * It's where we update the cumulative data for all windows, including the graph masks, regardless of their visibility + * It's also where we compose the graphs and text for visible windows into a picture ready for compositing with the window contents */ +static void proc_sample_callback(vmon_t *vmon, void *sys_cb_arg, vmon_proc_t *proc, void *proc_cb_arg) +{ + vwm_charts_t *charts = sys_cb_arg; + vwm_chart_t *chart = proc_cb_arg; + + VWM_TRACE("proc=%p chart=%p", proc, chart); + + /* render the various always-updated charts, this is the component we do regardless of the charts mode and window visibility, + * essentially the incrementally rendered/historic components */ + maintain_chart(charts, chart); + + /* XXX TODO: we used to mark repaint as being needed if this chart's window was mapped, but + * since extricating charts from windows that's no longer convenient, and repaint is + * always performed after a sample. Make sure the repainting isn't costly when nothing + * charted is mapped (the case that code optimized) + */ +} + + +/* return the composed height of the chart */ +static int vwm_chart_composed_height(vwm_charts_t *charts, vwm_chart_t *chart) +{ + int snowflakes = chart->snowflakes_cnt ? 1 + chart->snowflakes_cnt : 0; /* don't include the separator row if there are no snowflakes */ + + return MIN((chart->heirarchy_end + snowflakes) * CHART_ROW_HEIGHT, chart->visible_height); +} + + +/* reset snowflakes on the specified chart */ +void vwm_chart_reset_snowflakes(vwm_charts_t *charts, vwm_chart_t *chart) +{ + if (chart->snowflakes_cnt) { + chart->snowflakes_cnt = 0; + chart->redraw_needed = 1; + } +} + + +static void free_chart_pictures(vwm_charts_t *charts, vwm_chart_t *chart) +{ + vwm_xserver_t *xserver = charts->xserver; + + XRenderFreePicture(xserver->display, chart->grapha_picture); + XRenderFreePicture(xserver->display, chart->graphb_picture); + XRenderFreePicture(xserver->display, chart->tmp_picture); + XRenderFreePicture(xserver->display, chart->text_picture); + XFreePixmap(xserver->display, chart->text_pixmap); + XRenderFreePicture(xserver->display, chart->shadow_picture); + XRenderFreePicture(xserver->display, chart->picture); + +} + + +static void copy_chart_pictures(vwm_charts_t *charts, vwm_chart_t *src, vwm_chart_t *dest) +{ + vwm_xserver_t *xserver = charts->xserver; + + if (!src->width) + return; + + /* XXX: note the graph pictures are copied from their current phase in the x dimension */ + XRenderComposite(xserver->display, PictOpSrc, src->grapha_picture, None, dest->grapha_picture, + src->phase, 0, /* src x, y */ + 0, 0, /* mask x, y */ + dest->phase, 0, /* dest x, y */ + src->width, src->height); + XRenderComposite(xserver->display, PictOpSrc, src->graphb_picture, None, dest->graphb_picture, + src->phase, 0, /* src x, y */ + 0, 0, /* mask x, y */ + dest->phase, 0, /* dest x, y */ + src->width, src->height); + XRenderComposite(xserver->display, PictOpSrc, src->text_picture, None, dest->text_picture, + 0, 0, /* src x, y */ + 0, 0, /* mask x, y */ + 0, 0, /* dest x, y */ + src->width, src->height); + XRenderComposite(xserver->display, PictOpSrc, src->shadow_picture, None, dest->shadow_picture, + 0, 0, /* src x, y */ + 0, 0, /* mask x, y */ + 0, 0, /* dest x, y */ + src->width, src->height); + XRenderComposite(xserver->display, PictOpSrc, src->picture, None, dest->picture, + 0, 0, /* src x, y */ + 0, 0, /* mask x, y */ + 0, 0, /* dest x, y */ + src->width, src->height); +} + + +/* (re)size the specified chart's visible dimensions */ +int vwm_chart_set_visible_size(vwm_charts_t *charts, vwm_chart_t *chart, int width, int height) +{ + if (width != chart->visible_width || height != chart->visible_height) + chart->redraw_needed = 1; + + /* TODO error handling: if a create failed but we had an chart, free whatever we created and leave it be, succeed. + * if none existed it's a hard error and we must propagate it. */ + + /* if larger than the charts currently are, enlarge them */ + if (width > chart->width || height > chart->height) { + vwm_chart_t existing = *chart; + + chart->width = MAX(chart->width, MAX(width, CHART_GRAPH_MIN_WIDTH)); + chart->height = MAX(chart->height, MAX(height, CHART_GRAPH_MIN_HEIGHT)); + + chart->grapha_picture = create_picture_fill(charts, chart->width, chart->height, CHART_MASK_DEPTH, CPRepeat, &pa_repeat, &chart_trans_color, NULL); + chart->graphb_picture = create_picture_fill(charts, chart->width, chart->height, CHART_MASK_DEPTH, CPRepeat, &pa_repeat, &chart_trans_color, NULL); + chart->tmp_picture = create_picture(charts, chart->width, CHART_ROW_HEIGHT, CHART_MASK_DEPTH, 0, NULL, NULL); + + /* keep the text_pixmap reference around for XDrawText usage */ + chart->text_picture = create_picture_fill(charts, chart->width, chart->height, CHART_MASK_DEPTH, 0, NULL, &chart_trans_color, &chart->text_pixmap); + + chart->shadow_picture = create_picture_fill(charts, chart->width, chart->height, CHART_MASK_DEPTH, 0, NULL, &chart_trans_color, NULL); + chart->picture = create_picture(charts, chart->width, chart->height, 32, 0, NULL, NULL); + + copy_chart_pictures(charts, &existing, chart); + free_chart_pictures(charts, &existing); + } + + chart->visible_width = width; + chart->visible_height = height; + + return 1; +} + + +/* create an chart and start monitoring for the supplied pid */ +vwm_chart_t * vwm_chart_create(vwm_charts_t *charts, int pid, int width, int height) +{ + vwm_chart_t *chart; + + chart = calloc(1, sizeof(vwm_chart_t)); + if (!chart) { + VWM_PERROR("Unable to allocate vwm_chart_t"); + goto _err; + } + + /* add the client process to the monitoring heirarchy */ + /* XXX note libvmon here maintains a unique callback for each unique callback+xwin pair, so multi-window processes work */ + chart->monitor = vmon_proc_monitor(&charts->vmon, NULL, pid, VMON_WANT_PROC_INHERIT, (void (*)(vmon_t *, void *, vmon_proc_t *, void *))proc_sample_callback, chart); + if (!chart->monitor) { + VWM_ERROR("Unable to establish proc monitor"); + goto _err_free; + } + + /* FIXME: count_rows() isn't returning the right count sometimes (off by ~1), it seems to be related to racing with the automatic child monitoring */ + /* the result is an extra row sometimes appearing below the process heirarchy */ + chart->heirarchy_end = 1 + count_rows(chart->monitor); + chart->gen_last_composed = -1; + + if (!vwm_chart_set_visible_size(charts, chart, width, height)) { + VWM_ERROR("Unable to set initial chart size"); + goto _err_unmonitor; + } + + return chart; + +_err_unmonitor: + vmon_proc_unmonitor(&charts->vmon, chart->monitor, (void (*)(vmon_t *, void *, vmon_proc_t *, void *))proc_sample_callback, chart); + +_err_free: + free(chart); +_err: + return NULL; +} + + +/* stop monitoring and destroy the supplied chart */ +void vwm_chart_destroy(vwm_charts_t *charts, vwm_chart_t *chart) +{ + vmon_proc_unmonitor(&charts->vmon, chart->monitor, (void (*)(vmon_t *, void *, vmon_proc_t *, void *))proc_sample_callback, chart); + free_chart_pictures(charts, chart); + free(chart); +} + + +/* this composes the maintained chart into the base chart picture, this gets called from paint_all() on every repaint of xwin */ +/* we noop the call if the gen_last_composed and monitor->proc.generation numbers match, indicating there's nothing new to compose. */ +void vwm_chart_compose(vwm_charts_t *charts, vwm_chart_t *chart, XserverRegion *res_damaged_region) +{ + vwm_xserver_t *xserver = charts->xserver; + int height; + + if (!chart->width || !chart->height) + return; + + if (chart->gen_last_composed == chart->monitor->generation) + return; /* noop if no sampling occurred since last compose */ + + chart->gen_last_composed = chart->monitor->generation; /* remember this generation */ + + //VWM_TRACE("composing %p", chart); + + height = vwm_chart_composed_height(charts, chart); + + /* fill the chart picture with the background */ + XRenderComposite(xserver->display, PictOpSrc, charts->bg_fill, None, chart->picture, + 0, 0, + 0, 0, + 0, 0, + chart->visible_width, height); + + /* draw the graphs into the chart through the stencils being maintained by the sample callbacks */ + XRenderComposite(xserver->display, PictOpOver, charts->grapha_fill, chart->grapha_picture, chart->picture, + 0, 0, + chart->phase, 0, + 0, 0, + chart->visible_width, height); + XRenderComposite(xserver->display, PictOpOver, charts->graphb_fill, chart->graphb_picture, chart->picture, + 0, 0, + chart->phase, 0, + 0, 0, + chart->visible_width, height); + + /* draw the shadow into the chart picture using a translucent black source drawn through the shadow mask */ + XRenderComposite(xserver->display, PictOpOver, charts->shadow_fill, chart->shadow_picture, chart->picture, + 0, 0, + 0, 0, + 0, 0, + chart->visible_width, height); + + /* render chart text into the chart picture using a white source drawn through the chart text as a mask, on top of everything */ + XRenderComposite(xserver->display, PictOpOver, charts->text_fill, chart->text_picture, chart->picture, + 0, 0, + 0, 0, + 0, 0, + chart->visible_width, (chart->heirarchy_end * CHART_ROW_HEIGHT)); + + XRenderComposite(xserver->display, PictOpOver, charts->snowflakes_text_fill, chart->text_picture, chart->picture, + 0, 0, + 0, chart->heirarchy_end * CHART_ROW_HEIGHT, + 0, chart->heirarchy_end * CHART_ROW_HEIGHT, + chart->visible_width, height - (chart->heirarchy_end * CHART_ROW_HEIGHT)); + + /* damage the window to ensure the updated chart is drawn (TODO: this can be done more selectively/efficiently) */ + if (res_damaged_region) { + XRectangle damage = {}; + + damage.width = chart->visible_width; + damage.height = chart->visible_height; + + *res_damaged_region = XFixesCreateRegion(xserver->display, &damage, 1); + } +} + + +/* render the chart into a picture at the specified coordinates and dimensions */ +void vwm_chart_render(vwm_charts_t *charts, vwm_chart_t *chart, int op, Picture dest, int x, int y, int width, int height) +{ + vwm_xserver_t *xserver = charts->xserver; + + if (!chart->width || !chart->height) + return; + + /* draw the monitoring chart atop dest, note we stay within the window borders here. */ + XRenderComposite(xserver->display, op, chart->picture, None, dest, + 0, 0, 0, 0, /* src x,y, maxk x, y */ + x, /* dst x */ + y, /* dst y */ + width, MIN(vwm_chart_composed_height(charts, chart), height) /* FIXME */); /* w, h */ +} + + +/* increase the sample rate relative to current using the table of intervals */ +void vwm_charts_rate_increase(vwm_charts_t *charts) +{ + int i; + + assert(charts); + + for (i = 0; i < NELEMS(sampling_intervals); i++) { + if (sampling_intervals[i] < charts->sampling_interval) { + charts->sampling_interval = sampling_intervals[i]; + break; + } + } +} + + +/* decrease the sample rate relative to current using the table of intervals */ +void vwm_charts_rate_decrease(vwm_charts_t *charts) +{ + int i; + + assert(charts); + + for (i = NELEMS(sampling_intervals) - 1; i >= 0; i--) { + if (sampling_intervals[i] > charts->sampling_interval) { + charts->sampling_interval = sampling_intervals[i]; + break; + } + } +} + + +/* set an arbitrary sample rate rather than using one of the presets, 0 to pause */ +void vwm_charts_rate_set(vwm_charts_t *charts, unsigned hertz) +{ + assert(charts); + + /* XXX: note floating point divide by 0 simply results in infinity */ + charts->sampling_interval = 1.0f / (float)hertz; +} + + +/* convenience function for returning the time delta as a seconds.fraction float */ +static float delta(struct timeval *cur, struct timeval *prev) +{ + struct timeval res; + float delta; + + /* determine the # of whole.fractional seconds between prev and cur */ + timersub(cur, prev, &res); + + delta = res.tv_sec; + delta += (float)((float)res.tv_usec) / 1000000.0; + + return delta; +} + + +/* update the charts if necessary, return if updating occurred, and duration before another update needed in *desired_delay */ +int vwm_charts_update(vwm_charts_t *charts, int *desired_delay) +{ + float this_delta = 0.0f; + int ret = 0; + + gettimeofday(&charts->maybe_sample, NULL); + if ((charts->sampling_interval == INFINITY && !charts->sampling_paused) || /* XXX this is kind of a kludge to get the 0 Hz indicator drawn before pausing */ + (charts->sampling_interval != INFINITY && ((this_delta = delta(&charts->maybe_sample, &charts->this_sample)) >= charts->sampling_interval))) { + vmon_sys_stat_t *sys_stat; + + /* automatically lower the sample rate if we can't keep up with the current sample rate */ + if (charts->sampling_interval < INFINITY && + charts->sampling_interval <= charts->prev_sampling_interval && + this_delta >= (charts->sampling_interval * 1.5)) { + + /* require > 1 contiguous drops before lowering the rate, tolerates spurious one-off stalls */ + if (++charts->contiguous_drops > 2) + vwm_charts_rate_decrease(charts); + } else { + charts->contiguous_drops = 0; + } + + /* age the sys-wide sample data into "last" variables, before the new sample overwrites them. */ + charts->last_sample = charts->this_sample; + charts->this_sample = charts->maybe_sample; + if ((sys_stat = charts->vmon.stores[VMON_STORE_SYS_STAT])) { + charts->last_user_cpu = sys_stat->user; + charts->last_system_cpu = sys_stat->system; + charts->last_total = sys_stat->user + + sys_stat->nice + + sys_stat->system + + sys_stat->idle + + sys_stat->iowait + + sys_stat->irq + + sys_stat->softirq + + sys_stat->steal + + sys_stat->guest; + + charts->last_idle = sys_stat->idle; + charts->last_iowait = sys_stat->iowait; + } + + ret = vmon_sample(&charts->vmon); /* XXX: calls proc_sample_callback() for explicitly monitored processes after sampling their descendants */ + /* XXX: also calls sample_callback() per invocation after sampling the sys wants */ + + charts->sampling_paused = (charts->sampling_interval == INFINITY); + charts->prev_sampling_interval = charts->sampling_interval; + } + + /* TODO: make some effort to compute how long to sleep, but this is perfectly fine for now. */ + *desired_delay = charts->sampling_interval == INFINITY ? -1 : charts->sampling_interval * 300.0; + + return ret; +} |