linux-kernel - Re: [PATCH v2 00/11] perf c2c: Sort cacheline with all loads

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Date:   Sat, 16 Jan 2021 08:45:11 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Joe Mario <jmario@...hat.com>, David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/11] perf c2c: Sort cacheline with all loads

On Fri, Jan 15, 2021 at 12:17:01PM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > > Thanks for the review, Jiri.
> > > 
> > > Note, after testing with Arm SPE, we found the store operations don't
> > > contain the information for L1 cache hit or miss, this leads to there
> > > have no statistics for "st_l1hit" and "st_l1miss"; finally the single
> > > cache line view only can show the load samples and fails to show store
> > > opreations due to the empty statistics for "st_l1hit" and "st_l1miss".
> > > 
> > > This is related the hardware issue, after some discussion internally,
> > > so far cannot find a easy way to set memory flag for L1 cache hit or
> > > miss for store operations (more specific, set flags PERF_MEM_LVL_HIT or
> > > PERF_MEM_LVL_MISS for store's L1 cache accessing).
> > > 
> > > Given it is uncertain for this issue, please hold on for this patch
> > > series and I will resend if have any conclusion.
> > > 
> > > And really sorry I notify this too late.
> > 
> > no problem, I think we can take some of the refactoring patches anyway
> 
> Agreed, in fact I already processed this series in my local branch and
> I'm test building everything now.

Thanks a lot, Arnalod.

Just remind in case you miss the latest series due to the flood emails,
I have extracted and refined the refactoring patches, and have sent out
patch series v4 [1] for picking up (and have received ACK tags from
Namhyung and Jiri).

Leo