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

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Message-ID: <CAMYGaxrj37Wwan+UKKvvSj6M+G=ksNMscmF40JDMrKZmx5tD2g@mail.gmail.com>
Date:	Thu, 10 May 2012 22:18:46 +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

> If 2 different user-mode processes executing on 2 CPUs under 2 different
> users want to access the same shared memory through the

One correction:
This will happen even for different shared memory as the lock is global.
This fact just increases the relevance of this patch, dont you think ?

> shmctl(SHM_LOCK) / shmget(SHM_HUGETLB) / usr_shm_lock
> primitives, they could compete/spin even though their user_structs
> are different.
>
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