From: Rik van Riel <riel@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Konrad Wilk <konrad.wilk@oracle.com>,
Seth Jennings <sjenning@linux.vnet.ibm.com>,
Nitin Gupta <ngupta@vflare.org>,
Nebojsa Trpkovic <trx.lists@gmail.com>,
minchan@kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH] mm: implement WasActive page flag (for improving cleancache)
Date: Thu, 26 Jan 2012 22:33:18 -0500 [thread overview]
Message-ID: <4F221AFE.6070108@redhat.com> (raw)
In-Reply-To: <7198bfb3-1e32-40d3-8601-d88aed7aabd8@default>
On 01/26/2012 09:43 PM, Dan Magenheimer wrote:
> Maybe the Active page bit could be overloaded with some minor
> rewriting? IOW, perhaps the Active bit could be ignored when
> the page is moved to the inactive LRU? (Confusing I know, but I am
> just brainstorming...)
The PG_referenced bit is already overloaded. We keep
the bit set when we move a page from the active to the
inactive list, so a page that was previously active
only needs to be referenced once to become active again.
The LRU bits (PG_lru, PG_active, etc) are needed to
figure out which LRU list the page is on. I don't
think we can overload those...
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WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Konrad Wilk <konrad.wilk@oracle.com>,
Seth Jennings <sjenning@linux.vnet.ibm.com>,
Nitin Gupta <ngupta@vflare.org>,
Nebojsa Trpkovic <trx.lists@gmail.com>,
minchan@kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH] mm: implement WasActive page flag (for improving cleancache)
Date: Thu, 26 Jan 2012 22:33:18 -0500 [thread overview]
Message-ID: <4F221AFE.6070108@redhat.com> (raw)
In-Reply-To: <7198bfb3-1e32-40d3-8601-d88aed7aabd8@default>
On 01/26/2012 09:43 PM, Dan Magenheimer wrote:
> Maybe the Active page bit could be overloaded with some minor
> rewriting? IOW, perhaps the Active bit could be ignored when
> the page is moved to the inactive LRU? (Confusing I know, but I am
> just brainstorming...)
The PG_referenced bit is already overloaded. We keep
the bit set when we move a page from the active to the
inactive list, so a page that was previously active
only needs to be referenced once to become active again.
The LRU bits (PG_lru, PG_active, etc) are needed to
figure out which LRU list the page is on. I don't
think we can overload those...
--
All rights reversed
next prev parent reply other threads:[~2012-01-27 3:33 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-25 21:58 [PATCH] mm: implement WasActive page flag (for improving cleancache) Dan Magenheimer
2012-01-25 21:58 ` Dan Magenheimer
2012-01-26 17:28 ` Dave Hansen
2012-01-26 17:28 ` Dave Hansen
2012-01-26 21:28 ` Dan Magenheimer
2012-01-26 21:28 ` Dan Magenheimer
2012-01-27 0:31 ` Andrew Morton
2012-01-27 0:31 ` Andrew Morton
2012-01-27 0:56 ` Dan Magenheimer
2012-01-27 0:56 ` Dan Magenheimer
2012-01-27 1:15 ` Andrew Morton
2012-01-27 1:15 ` Andrew Morton
2012-01-27 2:43 ` Dan Magenheimer
2012-01-27 2:43 ` Dan Magenheimer
2012-01-27 3:33 ` Rik van Riel [this message]
2012-01-27 3:33 ` Rik van Riel
2012-01-27 5:15 ` Dan Magenheimer
2012-01-27 5:15 ` Dan Magenheimer
2012-01-30 8:57 ` KAMEZAWA Hiroyuki
2012-01-30 8:57 ` KAMEZAWA Hiroyuki
2012-01-30 22:03 ` Dan Magenheimer
2012-01-30 22:03 ` Dan Magenheimer
2012-01-27 13:43 ` James Bottomley
2012-01-27 13:43 ` James Bottomley
2012-01-27 17:32 ` Dan Magenheimer
2012-01-27 17:32 ` Dan Magenheimer
2012-01-27 17:54 ` James Bottomley
2012-01-27 17:54 ` James Bottomley
2012-01-27 18:46 ` Dan Magenheimer
2012-01-27 18:46 ` Dan Magenheimer
2012-01-27 21:49 ` James Bottomley
2012-01-27 21:49 ` James Bottomley
2012-01-29 0:50 ` Rik van Riel
2012-01-29 0:50 ` Rik van Riel
2012-01-29 22:25 ` James Bottomley
2012-01-29 22:25 ` James Bottomley
2012-01-27 3:28 ` Rik van Riel
2012-01-27 3:28 ` Rik van Riel
2012-01-27 5:11 ` Dan Magenheimer
2012-01-27 5:11 ` Dan Magenheimer
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