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| author | David S. Miller <davem@davemloft.net> | 2009-09-04 02:22:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-09-04 02:22:21 -0700 |
| commit | a29889a5369d2604c2053bcd051519a2445d8a70 (patch) | |
| tree | b17e8258894d079b4168994d9438ba7d6e7d1523 /kernel/perf_counter.c | |
| parent | e7a088f935180b90cfe6ab0aaae8a556f46885fe (diff) | |
| parent | 37d0892c5a94e208cf863e3b7bac014edee4346d (diff) | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 534e20d14d6..f274e195988 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1503,10 +1503,21 @@ static void perf_counter_enable_on_exec(struct task_struct *task) */ static void __perf_counter_read(void *info) { + struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context); struct perf_counter *counter = info; struct perf_counter_context *ctx = counter->ctx; unsigned long flags; + /* + * If this is a task context, we need to check whether it is + * the current task context of this cpu. If not it has been + * scheduled out before the smp call arrived. In that case + * counter->count would have been updated to a recent sample + * when the counter was scheduled out. + */ + if (ctx->task && cpuctx->task_ctx != ctx) + return; + local_irq_save(flags); if (ctx->is_active) update_context_time(ctx); @@ -1780,7 +1791,7 @@ static int perf_counter_read_group(struct perf_counter *counter, size += err; list_for_each_entry(sub, &leader->sibling_list, list_entry) { - err = perf_counter_read_entry(counter, read_format, + err = perf_counter_read_entry(sub, read_format, buf + size); if (err < 0) return err; @@ -2008,6 +2019,10 @@ int perf_counter_task_disable(void) return 0; } +#ifndef PERF_COUNTER_INDEX_OFFSET +# define PERF_COUNTER_INDEX_OFFSET 0 +#endif + static int perf_counter_index(struct perf_counter *counter) { if (counter->state != PERF_COUNTER_STATE_ACTIVE) |