diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2010-11-24 10:05:55 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2010-12-14 23:40:16 +0100 |
| commit | bb25ed06260128cf99a46950cc1b0b131e9c9477 (patch) | |
| tree | 988ea3188fb912a3a702dc9f2caa7cee2381f879 /kernel | |
| parent | c044cc9988cd29246c6d6781068c710817dd2f29 (diff) | |
perf: Fix inherit vs. context rotation bug
commit dddd3379a619a4cb8247bfd3c94ca9ae3797aa2e upstream.
It was found that sometimes children of tasks with inherited events had
one extra event. Eventually it turned out to be due to the list rotation
no being exclusive with the list iteration in the inheritance code.
Cure this by temporarily disabling the rotation while we inherit the events.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/perf_event.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index ac869dc7896..d1a6c04d839 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -1609,8 +1609,12 @@ static void rotate_ctx(struct perf_event_context *ctx) { raw_spin_lock(&ctx->lock); - /* Rotate the first entry last of non-pinned groups */ - list_rotate_left(&ctx->flexible_groups); + /* + * Rotate the first entry last of non-pinned groups. Rotation might be + * disabled by the inheritance code. + */ + if (!ctx->rotate_disable) + list_rotate_left(&ctx->flexible_groups); raw_spin_unlock(&ctx->lock); } @@ -5596,6 +5600,7 @@ int perf_event_init_task(struct task_struct *child) struct perf_event *event; struct task_struct *parent = current; int inherited_all = 1; + unsigned long flags; int ret = 0; child->perf_event_ctxp = NULL; @@ -5636,6 +5641,15 @@ int perf_event_init_task(struct task_struct *child) break; } + /* + * We can't hold ctx->lock when iterating the ->flexible_group list due + * to allocations, but we need to prevent rotation because + * rotate_ctx() will change the list from interrupt context. + */ + raw_spin_lock_irqsave(&parent_ctx->lock, flags); + parent_ctx->rotate_disable = 1; + raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); + list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) { ret = inherit_task_group(event, parent, parent_ctx, child, &inherited_all); @@ -5643,6 +5657,10 @@ int perf_event_init_task(struct task_struct *child) break; } + raw_spin_lock_irqsave(&parent_ctx->lock, flags); + parent_ctx->rotate_disable = 0; + raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); + child_ctx = child->perf_event_ctxp; if (child_ctx && inherited_all) { |