linux-kernel - Re: [PATCH 1/1] mlock: split the shmlock_user_lock spinlock into per user

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Message-ID: <CAMYGaxqxb=XR8R26h4e2URA2hG2M3j9V4u0DLJ9ifmkZKJa+eg@mail.gmail.com>
Date:	Thu, 10 May 2012 21:09:05 +0530
From:	rajman mekaco <rajman.mekaco@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...two.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/1] mlock: split the shmlock_user_lock spinlock into per
 user_struct spinlock

On Thu, May 10, 2012 at 8:24 PM, Rik van Riel <riel@...hat.com> wrote:
> On 05/10/2012 09:34 AM, rajman mekaco wrote:
>
>> Any updates on this ?
>
>
> There is still no usecase to demonstrate a problem, so no real
> justification to merge the patch.  Coming up with such a usecase
> is up to the submitter of the patch.

Maybe you didn't read my last email:
If 2 different user-mode processes executing on 2 CPUs under 2 different
users want to access the same shared memory through the
shmctl(SHM_LOCK) / shmget(SHM_HUGETLB) / usr_shm_lock
primitives, they could compete/spin even though their user_structs
are different.

Can you please correct me if I am missing some crucial point of understanding ?

Or did you mean that I should update the ChangeLog with this kind of
description ?

>
> --
> All rights reversed
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