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Date:   Mon, 18 Jan 2021 18:46:57 -0800
From:   Andi Kleen <>
To:     Namhyung Kim <>
Cc:     Peter Zijlstra <>,
        Arnaldo Carvalho de Melo <>,
        Jiri Olsa <>, Ingo Molnar <>,
        Mark Rutland <>,
        Alexander Shishkin <>,
        LKML <>,
        Stephane Eranian <>,
        Ian Rogers <>,
        Alexey Alexandrov <>
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.


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