linux-kernel - Re: [PATCH] mm: vmscan: deactivate isolated pages with lru lock released

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Message-ID: <CAJd=RBBMxr+9=hT5_v4yn7RwHOwVKUK42GzaHU3KyDqJ0SsW_w@mail.gmail.com>
Date:	Thu, 12 Jan 2012 21:32:32 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: vmscan: deactivate isolated pages with lru lock released

On Thu, Jan 12, 2012 at 10:28 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Wed, 11 Jan 2012 20:45:07 +0800
> Hillf Danton <dhillf@...il.com> wrote:
>
>> Spinners on other CPUs, if any, could take the lru lock and do their jobs while
>> isolated pages are deactivated on the current CPU if the lock is released
>> actively. And no risk of race raised as pages are already queued on locally
>> private list.
>>
>>
>> Signed-off-by: Hillf Danton <dhillf@...il.com>
>
> Doesn't this increase the number of lock/unlock ?
> Hmm, isn't it better to integrate clear_active_flags to isolate_pages() ?
> Then we don't need list scan.
>
Look at it soon.

Thanks,
Hillf
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