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: <87fv2fnb95.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Tue, 15 Sep 2015 15:00:06 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Takao Indoh <indou.takao@...fujitsu.com>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, a.p.zijlstra@...llo.nl,
	acme@...nel.org, vgoyal@...hat.com, 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:

> On 2015/09/08 18:32, Alexander Shishkin wrote:
>> 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.
>
> I have not seen this, I'll check it. You or someone else are working on
> api for process core dump?

Yes, I am. I'll make sure to include you in the next round of patches.

Regards,
--
Alex
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