linux-kernel - Re: [PATCH v2 1/3] perf/core: Add a tracepoint for perf sampling

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Message-ID: <20160803094805.GD6879@twins.programming.kicks-ass.net>
Date:	Wed, 3 Aug 2016 11:48:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Brendan Gregg <bgregg@...flix.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v2 1/3] perf/core: Add a tracepoint for perf sampling

On Wed, Aug 03, 2016 at 02:47:47AM +0000, Brendan Gregg wrote:
> When perf is performing hrtimer-based sampling, this tracepoint can be used
> by BPF to run additional logic on each sample. For example, BPF can fetch
> stack traces and frequency count them in kernel context, for an efficient
> profiler.

Urgh, no like.

And then next week we'll add a tracepoint to some other random pmu or
whatnot.