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

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Message-Id: <20120112112826.f4a8acea.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 12 Jan 2012 11:28:26 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hillf Danton <dhillf@...il.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 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.

Thanks,
-Kame

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