From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Takao Indoh <indou.takao@jp.fujitsu.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: Tue, 15 Sep 2015 15:00:06 +0300 [thread overview]
Message-ID: <87fv2fnb95.fsf@ashishki-desk.ger.corp.intel.com> (raw)
In-Reply-To: <55EF9505.4030708@jp.fujitsu.com>
Takao Indoh <indou.takao@jp.fujitsu.com> writes:
> 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?
Yes, I am. I'll make sure to include you in the next round of patches.
Regards,
--
Alex
next prev parent reply other threads:[~2015-09-15 12:00 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
2015-09-15 12:00 ` Alexander Shishkin [this message]
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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