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    SubjectRE: perf top for arm64?
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    > -----Original Message-----
    > From: linux-perf-users-owner@vger.kernel.org
    > <linux-perf-users-owner@vger.kernel.org> On Behalf Of Jiri Olsa
    > Sent: 2019年12月11日 1:09
    > To: John Garry <john.garry@huawei.com>
    > Cc: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>;
    > peterz@infradead.org; mingo@redhat.com;
    > alexander.shishkin@linux.intel.com; namhyung@kernel.org;
    > mark.rutland@arm.com; will@kernel.org; linux-kernel@vger.kernel.org;
    > linux-arm-kernel@lists.infradead.org; Linuxarm <linuxarm@huawei.com>;
    > linux-perf-users@vger.kernel.org
    > Subject: Re: perf top for arm64?
    >
    > On Tue, Dec 10, 2019 at 04:52:52PM +0000, John Garry wrote:
    > > On 10/12/2019 16:36, Jiri Olsa wrote:
    > > > On Tue, Dec 10, 2019 at 04:13:49PM +0000, John Garry wrote:
    > > > > Hi all,
    > > > >
    > > > > I find to my surprise that "perf top" does not work for arm64:
    > > > >
    > > > > root@ubuntu:/home/john/linux# tools/perf/perf top Couldn't read
    > > > > the cpuid for this machine: No such file or directory
    > > >
    > >
    > > Hi Jirka,
    > >
    > > > there was recent change that check on cpuid and quits:
    > > > 608127f73779 perf top: Initialize perf_env->cpuid, needed by the
    > > > per arch annotation init routine
    > > >
    > >
    > > ok, this is new code. I obviously didn't check the git history...
    > >
    > > But, apart from this, there are many other places where get_cpuid() is
    > > called. I wonder what else we're missing out on, and whether we should
    > > still add it.
    >
    > right, I was just wondering how come vendor events are working for you, but
    > realized we have get_cpuid_str being called in there ;-)
    >
    > I think we should add it as you have it prepared already, could you post it with
    > bigger changelog that would explain where it's being used for arm?

    Hi Jirka,

    I reported metricgroup cannot work on ARM64 before, however, no one can come up with a solution, could you take a look how to fix it? Thanks a lot!

    You can refer to below link for more info:
    [1] https://www.spinics.net/lists/linux-perf-users/msg09190.html (NACK by Will Deason)
    [2] https://www.spinics.net/lists/linux-perf-users/msg09324.html

    Best Regards,
    Joakim Zhang
    > jirka

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