linux-kernel - Re: [PATCH v7 7/9] perf: arm64: Add test for userspace counter access on heterogeneous systems

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Date:   Thu, 13 May 2021 09:05:42 +0000
From:   "nakamura.shun@...itsu.com" <nakamura.shun@...itsu.com>
To:     Rob Herring <robh@...nel.org>
CC:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "honnappa.nagarahalli@....com" <honnappa.nagarahalli@....com>,
        "Zachary.Leaf@....com" <Zachary.Leaf@....com>,
        Raphael Gault <raphael.gault@....com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Itaru Kitayama <itaru.kitayama@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 7/9] perf: arm64: Add test for userspace counter access
 on heterogeneous systems

Hi Rob

> Userspace counter access only works on heterogeneous systems with some
> restrictions. The userspace process must be pinned to a homogeneous
> subset of CPUs and must open the corresponding PMU for those CPUs. This
> commit adds a test implementing these requirements.

Are you planning to change x86 tests (tools/perf/arch/x86/tests/rdpmc.c) 
to use libperf as well?

Best Regards
Shunsuke