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From: Jiri Olsa <jolsa@redhat.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: "Jin, Yao" <yao.jin@linux.intel.com>,
	acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
	mingo@redhat.com, alexander.shishkin@linux.intel.com,
	Linux-kernel@vger.kernel.org, kan.liang@intel.com,
	yao.jin@intel.com
Subject: Re: [PATCH] perf stat: Show percore counts in per CPU output
Date: Mon, 10 Feb 2020 22:04:19 +0100	[thread overview]
Message-ID: <20200210210419.GD36715@krava> (raw)
In-Reply-To: <20200210170159.GV302770@tassilo.jf.intel.com>

On Mon, Feb 10, 2020 at 09:01:59AM -0800, Andi Kleen wrote:
> > > With --percore-show-thread, CPU0 and CPU4 have the same counts (CPU0 and
> > > CPU4 are siblings, e.g. 2,453,061 in my example). The value is sum of CPU0 +
> > > CPU4.
> > 
> > so it shows percore stats but displays all the cpus? what is this good for?
> 
> This is essentially a replacement for the any bit (which is gone in Icelake).
> Per core counts are useful for some formulas, e.g. CoreIPC
> 
> The original percore version was inconvenient to post process. This
> variant matches the output of the any bit.

I see, please put this to the changelog/doc

thanks,
jirka


  reply	other threads:[~2020-02-10 21:04 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06  1:56 [PATCH] perf stat: Show percore counts in per CPU output Jin Yao
2020-02-10 13:28 ` Jiri Olsa
2020-02-10 13:46   ` Jin, Yao
2020-02-10 14:01     ` Jiri Olsa
2020-02-10 17:01       ` Andi Kleen
2020-02-10 21:04         ` Jiri Olsa [this message]
2020-02-11  1:48           ` Jin, Yao

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