linux-kernel - Re: [PATCH] perf: Fix the mlock accounting, again

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Message-ID: <878sohdsgx.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Fri, 15 Nov 2019 18:17:34 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        tmricht@...ux.ibm.com, alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH] perf: Fix the mlock accounting, again

Alexander Shishkin <alexander.shishkin@...ux.intel.com> writes:

> Commit
>
>   5e6c3c7b1ec2 ("perf/aux: Fix tracking of auxiliary trace buffer allocation")
>
> tried to guess the correct combination of arithmetic operations that would
> undo the AUX buffer's mlock accounting, and failed, leaking the bottom part
> when an allocation needs to be changed partially to both user->locked_vm

s/changed/charged/