linux-kernel - Re: [PATCH RFC 0/5] perf: Add ioctl to emit sideband events

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Message-ID: <20230417110221.GH83892@hirez.programming.kicks-ass.net>
Date:   Mon, 17 Apr 2023 13:02:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/5] perf: Add ioctl to emit sideband events

On Fri, Apr 14, 2023 at 11:22:55AM +0300, Adrian Hunter wrote:
> Hi
> 
> Here is a stab at adding an ioctl for sideband events.
> 
> This is to overcome races when reading the same information
> from /proc.

What races? Are you talking about reading old state in /proc the kernel
delivering a sideband event for the new state, and then you writing the
old state out?

Surely that's something perf tool can fix without kernel changes?