/* * \/\/\ * * Copyright (C) 2012-2018 Vito Caputo - * * 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 . */ /* libvmon integration, warning: this gets a little crazy especially in the rendering. */ #include #include #include #include #include #include #include #include #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 64 /* 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); } /* determine if a given process has subsequent siblings in the heirarchy */ static inline int proc_has_subsequent_siblings(vmon_t *vmon, vmon_proc_t *proc) { struct list_head *sib, *head = &vmon->processes; if (proc->parent) head = &proc->parent->children; for (sib = proc->siblings.next; sib != head; sib = sib->next) { if (!(list_entry(sib, vmon_proc_t, siblings)->is_stale)) return 1; } return 0; } /* 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_len = MIN(sizeof(str) - 1, 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; 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 */ if (proc_has_subsequent_siblings(&charts->vmon, ancestor)) 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) */ } /* 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); str_len = MIN(sizeof(str) - 1, 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; /* 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); if (existing.width) { 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; }