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From: Takao Indoh <indou.takao@jp.fujitsu.com>
To: <alexander.shishkin@linux.intel.com>, <tglx@linutronix.de>,
	<mingo@redhat.com>, <hpa@zytor.com>, <a.p.zijlstra@chello.nl>,
	<acme@kernel.org>, <vgoyal@redhat.com>, <rostedt@goodmis.org>
Cc: <linux-kernel@vger.kernel.org>, <x86@kernel.org>
Subject: Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer
Date: Wed, 9 Sep 2015 11:10:13 +0900	[thread overview]
Message-ID: <55EF9505.4030708@jp.fujitsu.com> (raw)
In-Reply-To: <87r3m9fe8b.fsf@ashishki-desk.ger.corp.intel.com>

On 2015/09/08 18:32, Alexander Shishkin wrote:
> Takao Indoh <indou.takao@jp.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?

Thanks,
Takao Indoh

> 
> [1] https://lkml.org/lkml/2014/10/13/290
> 
> Thanks,
> --
> Alex
> 



  reply	other threads:[~2015-09-09  2:10 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-08  5:49 [PATCH v2 0/4] x86: Intel Processor Trace Logger Takao Indoh
2015-09-08  5:49 ` [PATCH v2 1/4] perf/trace: Add function to find event type by name Takao Indoh
2015-09-08  5:49 ` [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer Takao Indoh
2015-09-08  9:32   ` Alexander Shishkin
2015-09-09  2:10     ` Takao Indoh [this message]
2015-09-15 12:00       ` Alexander Shishkin
2015-09-08  5:49 ` [PATCH v2 3/4] perf/x86/intel/pt: Add Intel PT logger Takao Indoh
2015-09-08  9:48   ` Alexander Shishkin
2015-09-09  2:40     ` Takao Indoh
2015-09-15 12:01       ` Alexander Shishkin
2015-09-08  5:49 ` [PATCH v2 4/4] x86: Stop Intel PT and save its registers when panic occurs Takao Indoh

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