linux-kernel - Re: [PATCH] perf: Make the mlock accounting simple again

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Message-ID: <C0F2E8FA-925C-4D71-9628-554270034422@fb.com>
Date:   Wed, 20 Nov 2019 17:17:24 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf: Make the mlock accounting simple again



> On Nov 20, 2019, at 9:06 AM, Alexander Shishkin <alexander.shishkin@...ux.intel.com> wrote:
> 
> Commit
> 
>  d44248a41337 ("perf/core: Rework memory accounting in perf_mmap()")
> 
> does a lot of things to the mlock accounting arithmetics, while the only
> thing that actually needed to happen is subtracting the part that is
> charged to the mm from the part that is charged to the user, so that the
> former isn't charged twice.
> 
> Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: songliubraving@...com

Acked-by: Song Liu <songliubraving@...com>

Thanks for the fix!