linux-kernel - Re: [PATCH v2 11/13] perf tools: improve IBS error handling

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Date:   Thu, 18 Nov 2021 15:02:55 -0600
From:   Kim Phillips <kim.phillips@....com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        acme@...hat.com, jolsa@...hat.com, songliubraving@...com,
        mpe@...erman.id.au, maddy@...ux.ibm.com
Subject: Re: [PATCH v2 11/13] perf tools: improve IBS error handling



On 11/17/21 3:15 AM, Stephane Eranian wrote:
> Kim,
> 
> On Tue, Nov 16, 2021 at 8:46 AM Kim Phillips <kim.phillips@....com> wrote:
>>
>> On 11/11/21 2:44 AM, Stephane Eranian wrote:
>>> From: Kim Phillips <kim.phillips@....com>
>>>
>>> This patch improves the error message returned on failed perf_event_open() on
>>> AMD when using IBS.
>>>
>>> Signed-off-by: Kim Phillips <kim.phillips@....com>
>>> ---
>>
>> Hi, AFAICT this v2 == v1, i.e., this patch doesn't address the comments
>> raised in v1:
>>
>> https://lore.kernel.org/lkml/aa40b532-0e95-76c0-6c9c-a91d45bf3468@amd.com/
>>
>> Arnaldo, orthogonal to this series, it'd be great if you could apply
>> these two patches:
>>
>> https://lore.kernel.org/lkml/20211004214114.188477-1-kim.phillips@amd.com/T/#mc4c9c582e3816ab31af6d0187e6803de1a98ac84
>>
> I don't understand why this patch is related to the IBS error
> handling. Patch 11/13 does not modify the evsel__env() function.

Without it, after applying patch 2/2 of that series and executing
the commands in 2/2's description will cause perf to sigsegv.

> I have included your change in the new version of the patch.
> Thanks.

You mean this one?:

>> Then, Stephane, you could drop this patch and in your next
>> version, patch 12/13 of this series would be replaced with
>> what's at the end of this email:
>>
>> https://lore.kernel.org/lkml/20211004214114.188477-1-kim.phillips@amd.com/T/#m885ead1f280445357c91cce53c01217913bd017b

If so, great, but patch 1/2 in the two-series set mentioned above
will need to be carried along with this series, unless acme
applies those two directly.

Thanks,

Kim