linux-kernel - Re: [PATCH 1/8] perf: Allow to block process in syscall tracepoints

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Message-ID: <20181213100525.GB5307@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Dec 2018 11:05:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Dmitry V. Levin" <ldv@...linux.org>, Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Luis Claudio R. Goncalves" <lclaudio@...g.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] perf: Allow to block process in syscall tracepoints

On Thu, Dec 13, 2018 at 11:01:49AM +0100, Peter Zijlstra wrote:
> One, very big maybe, would be to add a new tracepoint type that includes
> a might_sleep() and we very carefully undo all the preempt_disable and
> go sleep where we should. That also gives the tracepoint crud the
> information it needs to publish the capability to userspace.

Note that this includes handling fun things like the buffer getting
closed while we wait.