linux-kernel - Re: [PATCH v3 00/17] Compress the pmu

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Message-ID: <ea108115-f2dd-5767-1f86-34cdfdedc2a5@huawei.com>
Date:   Fri, 5 Aug 2022 09:11:21 +0100
From:   John Garry <john.garry@...wei.com>
To:     Ian Rogers <irogers@...gle.com>
CC:     Will Deacon <will@...nel.org>, James Clark <james.clark@....com>,
        "Mike Leach" <mike.leach@...aro.org>, Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Arnaldo Carvalho de Melo" <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        "Zhengjun Xing" <zhengjun.xing@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 00/17] Compress the pmu_event tables

On 02/08/2022 10:08, John Garry wrote:
> 
> 
>> we can ignore the costs of the strings as
>> they should be fully shared, especially for BDW-DE.
> 
> Are you sure about this? I did not think that the compiler would have 
> the intelligence to try to share strings. That is the basis of the size 
> optimisation which I was proposing (that the compiler would not share 
> strings).

JFYI, I am finding that all identical strings are shared, which is good.

Thanks,
John