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

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Date:   Fri, 15 Jan 2021 12:17:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Leo Yan <leo.yan@...aro.org>,
        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

Em Mon, Jan 04, 2021 at 10:35:40AM +0100, Jiri Olsa escreveu:
> On Mon, Jan 04, 2021 at 10:09:38AM +0800, Leo Yan wrote:
> 
> SNIP
> 
> > > > Leo Yan (11):
> > > >   perf c2c: Add dimensions for total load hit
> > > >   perf c2c: Add dimensions for load hit
> > > >   perf c2c: Add dimensions for load miss
> > > >   perf c2c: Rename for shared cache line stats
> > > >   perf c2c: Refactor hist entry validation
> > > >   perf c2c: Refactor display filter macro
> > > >   perf c2c: Refactor node display macro
> > > >   perf c2c: Refactor node header
> > > >   perf c2c: Add local variables for output metrics
> > > >   perf c2c: Sort on all cache hit for load operations
> > > >   perf c2c: Update documentation for display option 'all'
> > > > 
> > > >  tools/perf/Documentation/perf-c2c.txt |  21 +-
> > > >  tools/perf/builtin-c2c.c              | 548 ++++++++++++++++++++++----
> > > >  2 files changed, 487 insertions(+), 82 deletions(-)
> > > 
> > > Joe might want to test it first, but it looks all good to me:
> > > 
> > > Acked-by: Jiri Olsa <jolsa@...hat.com>
> > 
> > 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.

- Arnaldo