From 2e6cdf996ba43ce0b090ffbf754f83e17362cd69 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Wed, 12 May 2010 10:40:01 +0200 Subject: perf tools: change event inheritance logic in stat and record MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Cc: David S. Miller Cc: Frédéric Weisbecker Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra LKML-Reference: <4bea9d2f.d60ce30a.0b5b.08e1@mx.google.com> Signed-off-by: Stephane Eranian Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-record.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'tools/perf/builtin-record.c') 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, -- cgit v1.2.3