diff options
| author | Stephane Eranian <eranian@google.com> | 2010-05-12 10:40:01 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-05-13 21:39:12 +0200 |
| commit | 2e6cdf996ba43ce0b090ffbf754f83e17362cd69 (patch) | |
| tree | bb471a4ae13fa3941612c30c75bead7417084667 /tools/perf/builtin-record.c | |
| parent | perf hist: Fix missing getline declaration (diff) | |
| download | linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.tar.xz linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.zip | |
perf tools: change event inheritance logic in stat and record
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>
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 6b77b285fe10..0f467cf7aa72 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -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, |