linux-kernel - Re: [PATCH 2/4] perf vendor events amd: Add ITLB Instruction Fetch Hits event for zen1

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Date:   Fri, 4 Sep 2020 16:19:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Kim Phillips <kim.phillips@....com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Vijay Thakkar <vijaythakkar@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Yunfeng Ye <yeyunfeng@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Martin Liška <mliska@...e.cz>,
        Borislav Petkov <bp@...e.de>, Jon Grimm <jon.grimm@....com>,
        Martin Jambor <mjambor@...e.cz>,
        Michael Petlan <mpetlan@...hat.com>,
        William Cohen <wcohen@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] perf vendor events amd: Add ITLB Instruction Fetch
 Hits event for zen1

Em Wed, Sep 02, 2020 at 11:03:38PM -0700, Ian Rogers escreveu:
> On Tue, Sep 1, 2020 at 3:10 PM Kim Phillips <kim.phillips@....com> wrote:
> >
> > The ITLB Instruction Fetch Hits event isn't documented even in
> > later zen1 PPRs, but it seems to count correctly on zen1 hardware.
> >
> > Add it to zen1 group so zen1 users can use the upcoming IC Fetch Miss
> > Ratio Metric.
> >
> > The IF1G, 1IF2M, IF4K (Instruction fetches to a 1 GB, 2 MB, and 4K page)
> > unit masks are not added because unlike zen2 hardware, zen1 hardware
> > counts all its unit masks with a 0 unit mask according to the old
> > convention:
> >
> > zen1$ perf stat -e cpu/event=0x94/,cpu/event=0x94,umask=0xff/ sleep 1
> >
> >  Performance counter stats for 'sleep 1':
> >
> >            211,318      cpu/event=0x94/u
> >            211,318      cpu/event=0x94,umask=0xff/u
> >
> > Rome/zen2:
> >
> > zen2$ perf stat -e cpu/event=0x94/,cpu/event=0x94,umask=0xff/ sleep 1
> >
> >  Performance counter stats for 'sleep 1':
> >
> >                  0      cpu/event=0x94/u
> >            190,744      cpu/event=0x94,umask=0xff/u
> >
> > Signed-off-by: Kim Phillips <kim.phillips@....com>
> 
> Acked-by: Ian Rogers <irogers@...gle.com>

Thanks, applied.

- Arnaldo