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Date:   Thu, 27 Jul 2023 13:05:56 -0700
From:   Andi Kleen <ak@linux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>
Cc:     Ian Rogers <irogers@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 0/3] Parse event sort/regroup fixes
Message-ID: <ZMLOJNGDlvlU1NBD@tassilo>
References: <20230719001836.198363-1-irogers@google.com>
 <ZLf4C/+x2ZSpb1Uz@kernel.org>
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On Wed, Jul 19, 2023 at 11:49:47AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jul 18, 2023 at 05:18:33PM -0700, Ian Rogers escreveu:
> > Patch 1, fix:
> > perf stat -e cycles,slots,topdown-fe-bound
> > so that cycles isn't made a group leader (failure caused by PMUs
> > matching). Previously this event list would fail so not necessarily a
> > regression over previous perf release.
> > 
> > Patch 2, when regrouping events the leader needs to be updated due to
> > sorting. This fix causes larger event groups that then regress at
> > least the tigerlake metric test as the kernel PMU driver fails to
> > break the weak groups. This is a fix for a bug but the consequence of
> > fixing the bug is to make a passing test fail due to the kernel PMU
> > driver.
> > 
> > Patch 3, don't alter the list position of events without a group if
> > they don't need forcing into a group. Analysis showed this was the
> > cause of the issue reported by Andi Kleen:
> > https://lore.kernel.org/linux-perf-users/ZLBgbHkbrfGygM%2Fu@tassilo/
> 
> Andi,
> 
> 	Can you please check these patches and provide a Tested-by?

Tested-by: Andi Kleen <ak@linux.intel.com>

-Andi