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Date: Mon, 18 Jan 2021 18:46:57 -0800 From: Andi Kleen <ak@...ux.intel.com> To: Namhyung Kim <namhyung@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, LKML <linux-kernel@...r.kernel.org>, Stephane Eranian <eranian@...gle.com>, Ian Rogers <irogers@...gle.com>, Alexey Alexandrov <aalexand@...gle.com> Subject: Re: [PATCH] perf/core: Emit PERF_RECORD_LOST for pinned events > > I don't think I object to having an even in the stream, but your LOST > > event is unfortunate in that it itself can get lost when there's no > > space in the buffer (which arguably is unlikely, but still). > > > > So from that point of view, I think overloading LOST is not so very nice > > for this. > > But anything can get lost in case of no space. > Do you want to use something other than the LOST event? Could always reserve the last entry in the ring buffer for a LOST event, that would guarantee you can always get one out. -Andi
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