linux-kernel - Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE

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Message-ID: <20190920210411.GB2233839@devbig004.ftw2.facebook.com>
Date:   Fri, 20 Sep 2019 14:04:11 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Song Liu <liu.song.a23@...il.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature

On Fri, Sep 20, 2019 at 05:47:45PM +0900, Namhyung Kim wrote:
> Thanks for the sharing information!  For 32-bit, while the ino itself is not
> monotonic, gen << 32 + ino is monotonic right?  I think we can use the

It's not.  gen gets incremented on every allocation, so it has not
high but still realistic chance of collisions.

Thanks.

-- 
tejun