linux-kernel - Re: [RFC 00/13] perf_env/CPU socket reorg/fixes

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Message-ID: <20150911130339.GI23511@kernel.org>
Date:	Fri, 11 Sep 2015 10:03:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Kan Liang <kan.liang@...el.com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 00/13] perf_env/CPU socket reorg/fixes

Em Fri, Sep 11, 2015 at 08:20:54PM +0800, Wangnan (F) escreveu:
> I have tested patch 1 to 10. They looks good to me except patch 4/13. Please

Ok, I'll take that as a Tested-by: you for 1-10 with 4/13 having the
checks added, ok?

> see my email in that thread.

I add those checks.
 
> However, during the testing I found a limitation related to cpu
> online/offline and 'perf top' that, if I offline most of cores before
> 'perf top', then online them during 'perf top' running, 'perf top'
> dooesn't report new CPUs. It still reports the CPUs which are online

<SNIP>
 
> However, It is relatively a rare case. I don't think we have to fix it
> in this patchset.

Yup, unrelated to this patchset. But we need to seamlessly support that
situation, even telling the user that a CPU went offline/online.

- Arnaldo
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