perf timechart: Add a process filter

During the Kernel Summit demo of perf/ftrace/timechart, there
was a feature request to have a process filter for timechart so
that you can zoom into one or a few processes that you are
really interested in.

This patch adds basic support for this feature, the -p
(--process) option now can select a PID or a process name to be
shown. Multiple -p options are allowed, and the combined set
will be included in the output.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091020070939.7d0fb8a7@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 106 insertions, 4 deletions

diff --git a/tools/perf/Documentation/perf-timechart.txt b/tools/perf/Documentation/perf-timechart.txt
index a7910099d6f..4b1788355ec 100644
--- a/tools/perf/Documentation/perf-timechart.txt
+++ b/tools/perf/Documentation/perf-timechart.txt
@@ -31,9 +31,12 @@ OPTIONS
 -w::
 --width=::
         Select the width of the SVG file (default: 1000)
--p::
+-P::
 --power-only::
         Only output the CPU power section of the diagram
+-p::
+--process::
+        Select the processes to display, by name or PID
 
 
 SEE ALSO
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index e8a510d935e..34fad57087f 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -153,6 +153,17 @@ static struct wake_event     *wake_events;
 
 struct sample_wrapper *all_samples;
 
+
+struct process_filter;
+struct process_filter {
+        char                    *name;
+        int                     pid;
+        struct process_filter   *next;
+};
+
+static struct process_filter *process_filter;
+
+
 static struct per_pid *find_create_pid(int pid)
 {
         struct per_pid *cursor = all_data;
@@ -763,11 +774,11 @@ static void draw_wakeups(void)
                                 c = p->all;
                                 while (c) {
                                         if (c->Y && c->start_time <= we->time && c->end_time >= we->time) {
-                                                if (p->pid == we->waker) {
+                                                if (p->pid == we->waker && !from) {
                                                         from = c->Y;
                                                         task_from = strdup(c->comm);
                                                 }
-                                                if (p->pid == we->wakee) {
+                                                if (p->pid == we->wakee && !to) {
                                                         to = c->Y;
                                                         task_to = strdup(c->comm);
                                                 }
@@ -882,12 +893,89 @@ static void draw_process_bars(void)
         }
 }
 
+static void add_process_filter(const char *string)
+{
+        struct process_filter *filt;
+        int pid;
+
+        pid = strtoull(string, NULL, 10);
+        filt = malloc(sizeof(struct process_filter));
+        if (!filt)
+                return;
+
+        filt->name = strdup(string);
+        filt->pid  = pid;
+        filt->next = process_filter;
+
+        process_filter = filt;
+}
+
+static int passes_filter(struct per_pid *p, struct per_pidcomm *c)
+{
+        struct process_filter *filt;
+        if (!process_filter)
+                return 1;
+
+        filt = process_filter;
+        while (filt) {
+                if (filt->pid && p->pid == filt->pid)
+                        return 1;
+                if (strcmp(filt->name, c->comm) == 0)
+                        return 1;
+                filt = filt->next;
+        }
+        return 0;
+}
+
+static int determine_display_tasks_filtered(void)
+{
+        struct per_pid *p;
+        struct per_pidcomm *c;
+        int count = 0;
+
+        p = all_data;
+        while (p) {
+                p->display = 0;
+                if (p->start_time == 1)
+                        p->start_time = first_time;
+
+                /* no exit marker, task kept running to the end */
+                if (p->end_time == 0)
+                        p->end_time = last_time;
+
+                c = p->all;
+
+                while (c) {
+                        c->display = 0;
+
+                        if (c->start_time == 1)
+                                c->start_time = first_time;
+
+                        if (passes_filter(p, c)) {
+                                c->display = 1;
+                                p->display = 1;
+                                count++;
+                        }
+
+                        if (c->end_time == 0)
+                                c->end_time = last_time;
+
+                        c = c->next;
+                }
+                p = p->next;
+        }
+        return count;
+}
+
 static int determine_display_tasks(u64 threshold)
 {
         struct per_pid *p;
         struct per_pidcomm *c;
         int count = 0;
 
+        if (process_filter)
+                return determine_display_tasks_filtered();
+
         p = all_data;
         while (p) {
                 p->display = 0;
@@ -1153,6 +1241,14 @@ static int __cmd_record(int argc, const char **argv)
         return cmd_record(i, rec_argv, NULL);
 }
 
+static int
+parse_process(const struct option *opt __used, const char *arg, int __used unset)
+{
+        if (arg)
+                add_process_filter(arg);
+        return 0;
+}
+
 static const struct option options[] = {
         OPT_STRING('i', "input", &input_name, "file",
                     "input file name"),
@@ -1160,8 +1256,11 @@ static const struct option options[] = {
                     "output file name"),
         OPT_INTEGER('w', "width", &svg_page_width,
                     "page width"),
-        OPT_BOOLEAN('p', "power-only", &power_only,
+        OPT_BOOLEAN('P', "power-only", &power_only,
                     "output power data only"),
+        OPT_CALLBACK('p', "process", NULL, "process",
+                      "process selector. Pass a pid or process name.",
+                       parse_process),
         OPT_END()
 };