diff options
author | Paul Mackerras <paulus@samba.org> | 2009-06-30 06:07:19 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-06-30 10:00:16 (GMT) |
commit | 57e7986ed142417498155ebcd5eaf617ac37136d (patch) | |
tree | 81ce9acd79ee7e6383dfd5cdadc4e016a012990e /kernel/perf_counter.c | |
parent | 051ae7f7344f453616b6b10332d4d8e1d40ed823 (diff) | |
download | linux-fsl-qoriq-57e7986ed142417498155ebcd5eaf617ac37136d.tar.xz |
perf_counter: Provide a way to enable counters on exec
This provides a way to mark a counter to be enabled on the next
exec. This is useful for measuring the total activity of a
program without including overhead from the process that
launches it.
This also changes the perf stat command to use this new
facility.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <19017.43927.838745.689203@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
-rw-r--r-- | kernel/perf_counter.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 66ab1e9..d55a50d 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1429,6 +1429,53 @@ void perf_counter_task_tick(struct task_struct *curr, int cpu) } /* + * Enable all of a task's counters that have been marked enable-on-exec. + * This expects task == current. + */ +static void perf_counter_enable_on_exec(struct task_struct *task) +{ + struct perf_counter_context *ctx; + struct perf_counter *counter; + unsigned long flags; + int enabled = 0; + + local_irq_save(flags); + ctx = task->perf_counter_ctxp; + if (!ctx || !ctx->nr_counters) + goto out; + + __perf_counter_task_sched_out(ctx); + + spin_lock(&ctx->lock); + + list_for_each_entry(counter, &ctx->counter_list, list_entry) { + if (!counter->attr.enable_on_exec) + continue; + counter->attr.enable_on_exec = 0; + if (counter->state >= PERF_COUNTER_STATE_INACTIVE) + continue; + counter->state = PERF_COUNTER_STATE_INACTIVE; + counter->tstamp_enabled = + ctx->time - counter->total_time_enabled; + enabled = 1; + } + + /* + * Unclone this context if we enabled any counter. + */ + if (enabled && ctx->parent_ctx) { + put_ctx(ctx->parent_ctx); + ctx->parent_ctx = NULL; + } + + spin_unlock(&ctx->lock); + + perf_counter_task_sched_in(task, smp_processor_id()); + out: + local_irq_restore(flags); +} + +/* * Cross CPU call to read the hardware counter */ static void __perf_counter_read(void *info) @@ -2949,6 +2996,9 @@ void perf_counter_comm(struct task_struct *task) { struct perf_comm_event comm_event; + if (task->perf_counter_ctxp) + perf_counter_enable_on_exec(task); + if (!atomic_read(&nr_comm_counters)) return; |