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perf tools: change event inheritance logic in stat and record

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By default, event inheritance across fork and pthread_create was on but the -i
option of stat and record, which enabled inheritance, led to believe it was off
by default.

This patch fixes this logic by inverting the meaning of the -i option.  By
default inheritance is on whether you attach to a process (-p), a thread (-t)
or start a process. If you pass -i, then you turn off inheritance. Turning off
inheritance if you don't need it, helps limit perf resource usage as well.

The patch also fixes perf stat -t xxxx and perf record -t xxxx which did not
start the counters.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4bea9d2f.d60ce30a.0b5b.08e1@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Stephane Eranian 2010-05-12 10:40:01 +02:00 committed by Arnaldo Carvalho de Melo
parent 8a0ecfb8b4
commit 2e6cdf996b
4 changed files with 15 additions and 15 deletions
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4
tools/perf/Documentation/perf-record.txt
View file

@ -69,8 +69,8 @@ OPTIONS
Output file name.
-i::
--inherit::
Child tasks inherit counters.
--no-inherit::
Child tasks do not inherit counters.
-F::
--freq=::
Profile at this frequency.

4
tools/perf/Documentation/perf-stat.txt
View file

@ -31,8 +31,8 @@ OPTIONS
hexadecimal event descriptor.
-i::
--inherit::
child tasks inherit counters
--no-inherit::
child tasks do not inherit counters
-p::
--pid=<pid>::
stat events on existing pid

12
tools/perf/builtin-record.c
View file

@ -54,7 +54,7 @@ static pid_t target_tid = -1;
static pid_t *all_tids = NULL;
static int thread_num = 0;
static pid_t child_pid = -1;
static bool inherit = true;
static bool no_inherit = false;
static enum write_mode_t write_mode = WRITE_FORCE;
static bool call_graph = false;
static bool inherit_stat = false;
@ -298,8 +298,8 @@ static void create_counter(int counter, int cpu)
attr->mmap = track;
attr->comm = track;
attr->inherit = inherit;
if (target_pid == -1 && !system_wide) {
attr->inherit = !no_inherit;
if (target_pid == -1 && target_tid == -1 && !system_wide) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
@ -641,7 +641,7 @@ static int __cmd_record(int argc, const char **argv)
close(child_ready_pipe[0]);
}
if ((!system_wide && !inherit) || profile_cpu != -1) {
if ((!system_wide && no_inherit) || profile_cpu != -1) {
open_counters(profile_cpu);
} else {
nr_cpus = read_cpu_map();
@ -821,8 +821,8 @@ static const struct option options[] = {
"event period to sample"),
OPT_STRING('o', "output", &output_name, "file",
"output file name"),
OPT_BOOLEAN('i', "inherit", &inherit,
"child tasks inherit counters"),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
"child tasks do not inherit counters"),
OPT_INTEGER('F', "freq", &user_freq,
"profile at this frequency"),
OPT_INTEGER('m', "mmap-pages", &mmap_pages,

10
tools/perf/builtin-stat.c
View file

@ -72,7 +72,7 @@ static unsigned int nr_cpus = 0;
static int run_idx = 0;
static int run_count = 1;
static bool inherit = true;
static bool no_inherit = false;
static bool scale = true;
static pid_t target_pid = -1;
static pid_t target_tid = -1;
@ -167,8 +167,8 @@ static int create_perf_stat_counter(int counter)
++ncreated;
}
} else {
attr->inherit = inherit;
if (target_pid == -1) {
attr->inherit = !no_inherit;
if (target_pid == -1 && target_tid == -1) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
@ -518,8 +518,8 @@ static const struct option options[] = {
OPT_CALLBACK('e', "event", NULL, "event",
"event selector. use 'perf list' to list available events",
parse_events),
OPT_BOOLEAN('i', "inherit", &inherit,
"child tasks inherit counters"),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
"child tasks do not inherit counters"),
OPT_INTEGER('p', "pid", &target_pid,
"stat events on existing process id"),
OPT_INTEGER('t', "tid", &target_tid,