Messages in this thread | | | From | Namhyung Kim <> | Date | Mon, 18 Jan 2021 20:44:20 +0900 | Subject | Re: [PATCH] perf/core: Emit PERF_RECORD_LOST for pinned events |
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Hi Peter,
On Mon, Jan 18, 2021 at 7:11 PM Peter Zijlstra <peterz@infradead.org> wrote: > > On Mon, Jan 18, 2021 at 12:43:23PM +0900, Namhyung Kim wrote: > > As of now we silently ignore pinned events when it's failed to be > > scheduled and make it error state not try to schedule it again. > > That means we won't get any samples for the event. > > > > But there's no way for users to notice and respond to it. Let's > > emit a lost event with a new misc bit to indicate this situation. > > Users should get a read(2) error IIRC, does that not work?
Ah, right. maybe I'm too specific to perf record's perspective.
In perf record, it doesn't use read(2) so I thought it should have the information in the stream of sample data.
Thanks, Namhyung
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