Re: [RFC][PATCH] mm: Fix RLIMIT_MEMLOCK

[Pekka Enberg]

On Mon, 27 May 2013, Peter Zijlstra wrote:
>> Before your patch pinned was included in locked and thus RLIMIT_MEMLOCK
>> had a single resource counter. After your patch RLIMIT_MEMLOCK is
>> applied separately to both -- more or less.

On Tue, May 28, 2013 at 7:37 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> Before the patch the count was doubled since a single page was counted
> twice: Once because it was mlocked (marked with PG_mlock) and then again
> because it was also pinned (the refcount was increased). Two different things.

Pinned vs. mlocked counting isn't the problem here. You changed
RLIMIT_MEMLOCK userspace ABI and that needs to be restored. So the
question is how can we preserve the old RLIMIT_MEMLOCK semantics while
avoiding the double accounting issue.

                        Pekka
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