From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1757704AbcHCKNf (ORCPT <rfc822;w@1wt.eu>);
	Wed, 3 Aug 2016 06:13:35 -0400
Received: from bombadil.infradead.org ([198.137.202.9]:40963 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1757381AbcHCKNc (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 3 Aug 2016 06:13:32 -0400
Date: Wed, 3 Aug 2016 11:48:05 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Brendan Gregg <bgregg@netflix.com>
Cc: Ingo Molnar <mingo@redhat.com>, Arnaldo Carvalho de Melo <acme@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
        Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH v2 1/3] perf/core: Add a tracepoint for perf sampling
Message-ID: <20160803094805.GD6879@twins.programming.kicks-ass.net>
References: <1470192469-11910-1-git-send-email-bgregg@netflix.com>
 <1470192469-11910-2-git-send-email-bgregg@netflix.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1470192469-11910-2-git-send-email-bgregg@netflix.com>
User-Agent: Mutt/1.5.23.1 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.