linux-kernel - Re: [PATCH v4 3/5] MIPS/Perf-events: Fix event check in validate

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Date:	Mon, 24 Jan 2011 15:38:34 +0800
From:	Deng-Cheng Zhu <dengcheng.zhu@...il.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	ralf@...ux-mips.org, a.p.zijlstra@...llo.nl, fweisbec@...il.com,
	will.deacon@....com, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, wuzhangjin@...il.com,
	paulus@...ba.org, mingo@...e.hu, acme@...hat.com,
	matt@...sole-pimps.org, ddaney@...iumnetworks.com
Subject: Re: [PATCH v4 3/5] MIPS/Perf-events: Fix event check in validate_event()

Thanks. The patch set was resent.


Deng-Cheng

2011/1/21 Sergei Shtylyov <sshtylyov@...sta.com>:
> Hello.
>
> On 21-01-2011 11:19, Deng-Cheng Zhu wrote:
>
>> Ignore events that are in off/error state or belong to a different PMU.
>
>> This patch originates from the following commit for ARM by Will Deacon:
>
>> - 65b4711ff513767341aa1915c822de6ec0de65cb
>>     ARM: 6352/1: perf: fix event validation
>
>>     The validate_event function in the ARM perf events backend has the
>>     following problems:
>
>>     1.) Events that are disabled count towards the cost.
>>     2.) Events associated with other PMUs [for example, software events or
>>         breakpoints] do not count towards the cost, but do fail
>> validation,
>>         causing the group to fail.
>
>>     This patch changes validate_event so that it ignores events in the
>>     PERF_EVENT_STATE_OFF state or that are scheduled for other PMUs.
>
>> Changes:
>> v4 - v3:
>> o None
>> v3 - v2:
>> o Keep all mentioned commits in the form of number + title + original
>> summary + (MIPS specific info when needed).
>> v2 - v1:
>> o Corrected the return value of the event check in validate_event().
>
>   The patch changes should follow the --- tearline, not precede it.
>
>> Acked-by: Will Deacon<will.deacon@....com>
>> Acked-by: David Daney<ddaney@...iumnetworks.com>
>> Signed-off-by: Deng-Cheng Zhu<dengcheng.zhu@...il.com>
>> ---
>
> WBR, Sergei
>
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