linux-kernel - Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer

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Message-ID: <87r3m9fe8b.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Tue, 08 Sep 2015 12:32:36 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Takao Indoh <indou.takao@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer

Takao Indoh <indou.takao@...fujitsu.com> writes:

> perf_event_create_kernel_counter is used to enable perf events in kernel
> without buffer for logging its events. This patch add new fucntion which
> enable perf events with ring buffer. Intel PT logger uses this to enable
> Intel PT and some associated events with its log buffer.

Have you seen [1] and related patches? I haven't gotten around to
updating them yet, but hopefully it's going to happen soon.

The problem is that for such api to work, this memory needs to be
accounted, especially when you start handling event inheritance. For
system crash dump it doesn't really matter, but I also need a similar
api for per-task core dumps, for example.

[1] https://lkml.org/lkml/2014/10/13/290

Thanks,
--
Alex
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