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authorPeter Zijlstra <peterz@infradead.org>2021-04-08 12:35:56 +0200
committerPeter Zijlstra <peterz@infradead.org>2021-04-16 16:32:40 +0200
commitef54c1a476aef7eef26fe13ea10dc090952c00f8 (patch)
tree1ac3881ba3f8f3027cc2817f894be12c1c9d8327 /include/linux/perf_event.h
parentperf intel-pt: Use aux_watermark (diff)
downloadlinux-dev-ef54c1a476aef7eef26fe13ea10dc090952c00f8.tar.xz
linux-dev-ef54c1a476aef7eef26fe13ea10dc090952c00f8.zip
perf: Rework perf_event_exit_event()
Make perf_event_exit_event() more robust, such that we can use it from other contexts. Specifically the up and coming remove_on_exec. For this to work we need to address a few issues. Remove_on_exec will not destroy the entire context, so we cannot rely on TASK_TOMBSTONE to disable event_function_call() and we thus have to use perf_remove_from_context(). When using perf_remove_from_context(), there's two races to consider. The first is against close(), where we can have concurrent tear-down of the event. The second is against child_list iteration, which should not find a half baked event. To address this, teach perf_remove_from_context() to special case !ctx->is_active and about DETACH_CHILD. [ elver@google.com: fix racing parent/child exit in sync_child_event(). ] Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210408103605.1676875-2-elver@google.com
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3f7f89ea5e51..3d478abf411c 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -607,6 +607,7 @@ struct swevent_hlist {
#define PERF_ATTACH_TASK_DATA 0x08
#define PERF_ATTACH_ITRACE 0x10
#define PERF_ATTACH_SCHED_CB 0x20
+#define PERF_ATTACH_CHILD 0x40
struct perf_cgroup;
struct perf_buffer;