From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Christoph Lameter <cl@linux-foundation.org>,
Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
David Rientjes <rientjes@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 03/12] mm: Share the anon_vma ref counts between KSM and page migration
Date: Fri, 19 Feb 2010 16:42:18 -0500 [thread overview]
Message-ID: <4B7F05BA.4080903@redhat.com> (raw)
In-Reply-To: <1266516162-14154-4-git-send-email-mel@csn.ul.ie>
On 02/18/2010 01:02 PM, Mel Gorman wrote:
> struct anon_vma {
> spinlock_t lock; /* Serialize access to vma list */
> -#ifdef CONFIG_KSM
> - atomic_t ksm_refcount;
> -#endif
> -#ifdef CONFIG_MIGRATION
> - atomic_t migrate_refcount;
> +#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
> +
> + /*
> + * The refcount is taken by either KSM or page migration
> + * to take a reference to an anon_vma when there is no
> + * guarantee that the vma of page tables will exist for
> + * the duration of the operation. A caller that takes
> + * the reference is responsible for clearing up the
> + * anon_vma if they are the last user on release
> + */
> + atomic_t refcount;
Calling it just refcount is probably confusing, since
the anon_vma is also referenced by being on the chain
with others.
Maybe "other_refcount" because it is refcounts taken
by things other than VMAs? I am sure there is a better
name possible...
--
All rights reversed.
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Christoph Lameter <cl@linux-foundation.org>,
Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
David Rientjes <rientjes@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 03/12] mm: Share the anon_vma ref counts between KSM and page migration
Date: Fri, 19 Feb 2010 16:42:18 -0500 [thread overview]
Message-ID: <4B7F05BA.4080903@redhat.com> (raw)
In-Reply-To: <1266516162-14154-4-git-send-email-mel@csn.ul.ie>
On 02/18/2010 01:02 PM, Mel Gorman wrote:
> struct anon_vma {
> spinlock_t lock; /* Serialize access to vma list */
> -#ifdef CONFIG_KSM
> - atomic_t ksm_refcount;
> -#endif
> -#ifdef CONFIG_MIGRATION
> - atomic_t migrate_refcount;
> +#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
> +
> + /*
> + * The refcount is taken by either KSM or page migration
> + * to take a reference to an anon_vma when there is no
> + * guarantee that the vma of page tables will exist for
> + * the duration of the operation. A caller that takes
> + * the reference is responsible for clearing up the
> + * anon_vma if they are the last user on release
> + */
> + atomic_t refcount;
Calling it just refcount is probably confusing, since
the anon_vma is also referenced by being on the chain
with others.
Maybe "other_refcount" because it is refcounts taken
by things other than VMAs? I am sure there is a better
name possible...
--
All rights reversed.
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next prev parent reply other threads:[~2010-02-19 21:43 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-18 18:02 [PATCH 0/12] Memory Compaction v3 Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 01/12] mm,migration: Take a reference to the anon_vma before migrating Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:12 ` KAMEZAWA Hiroyuki
2010-02-19 0:12 ` KAMEZAWA Hiroyuki
2010-02-19 13:59 ` Mel Gorman
2010-02-19 13:59 ` Mel Gorman
2010-02-19 16:43 ` Rik van Riel
2010-02-19 16:43 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 02/12] mm,migration: Do not try to migrate unmapped anonymous pages Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 16:45 ` Rik van Riel
2010-02-19 16:45 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 03/12] mm: Share the anon_vma ref counts between KSM and page migration Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:18 ` KAMEZAWA Hiroyuki
2010-02-19 0:18 ` KAMEZAWA Hiroyuki
2010-02-19 14:05 ` Mel Gorman
2010-02-19 14:05 ` Mel Gorman
2010-02-19 15:01 ` Christoph Lameter
2010-02-19 15:01 ` Christoph Lameter
2010-02-20 3:48 ` KAMEZAWA Hiroyuki
2010-02-20 3:48 ` KAMEZAWA Hiroyuki
2010-02-20 9:32 ` Mel Gorman
2010-02-20 9:32 ` Mel Gorman
2010-02-19 5:09 ` Minchan Kim
2010-02-19 5:09 ` Minchan Kim
2010-02-19 21:42 ` Rik van Riel [this message]
2010-02-19 21:42 ` Rik van Riel
2010-02-19 21:58 ` Mel Gorman
2010-02-19 21:58 ` Mel Gorman
2010-02-20 0:16 ` Rik van Riel
2010-02-20 0:16 ` Rik van Riel
2010-02-20 9:29 ` Mel Gorman
2010-02-20 9:29 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 04/12] mm: Document /proc/pagetypeinfo Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 1:36 ` Minchan Kim
2010-02-19 1:36 ` Minchan Kim
2010-02-19 21:42 ` Rik van Riel
2010-02-19 21:42 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 05/12] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:21 ` KAMEZAWA Hiroyuki
2010-02-19 0:21 ` KAMEZAWA Hiroyuki
2010-02-19 14:09 ` Mel Gorman
2010-02-19 14:09 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 06/12] Export unusable free space index via /proc/pagetypeinfo Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 1:35 ` Minchan Kim
2010-02-19 1:35 ` Minchan Kim
2010-02-19 21:46 ` Rik van Riel
2010-02-19 21:46 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 07/12] Export fragmentation " Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 1:59 ` Minchan Kim
2010-02-19 1:59 ` Minchan Kim
2010-02-20 0:16 ` Rik van Riel
2010-02-20 0:16 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 08/12] Memory compaction core Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:37 ` KAMEZAWA Hiroyuki
2010-02-19 0:37 ` KAMEZAWA Hiroyuki
2010-02-19 14:15 ` Mel Gorman
2010-02-19 14:15 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 09/12] Add /proc trigger for memory compaction Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:43 ` KAMEZAWA Hiroyuki
2010-02-19 0:43 ` KAMEZAWA Hiroyuki
2010-02-19 14:16 ` Mel Gorman
2010-02-19 14:16 ` Mel Gorman
2010-02-20 3:53 ` KAMEZAWA Hiroyuki
2010-02-20 3:53 ` KAMEZAWA Hiroyuki
2010-02-19 2:26 ` Minchan Kim
2010-02-19 2:26 ` Minchan Kim
2010-02-18 18:02 ` [PATCH 10/12] Add /sys trigger for per-node " Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 14:53 ` Greg KH
2010-02-19 14:53 ` Greg KH
2010-02-19 15:28 ` Mel Gorman
2010-02-19 15:28 ` Mel Gorman
2010-02-19 15:31 ` Greg KH
2010-02-19 15:31 ` Greg KH
2010-02-19 15:51 ` Mel Gorman
2010-02-19 15:51 ` Mel Gorman
2010-02-19 15:52 ` Mel Gorman
2010-02-19 15:52 ` Mel Gorman
2010-02-19 16:02 ` Greg KH
2010-02-19 16:02 ` Greg KH
2010-02-18 18:02 ` [PATCH 11/12] Direct compact when a high-order allocation fails Mel Gorman
2010-02-18 18:02 ` Mel Gorman
2010-02-19 0:51 ` KAMEZAWA Hiroyuki
2010-02-19 0:51 ` KAMEZAWA Hiroyuki
2010-02-19 14:19 ` Mel Gorman
2010-02-19 14:19 ` Mel Gorman
2010-02-19 2:41 ` Minchan Kim
2010-02-19 2:41 ` Minchan Kim
2010-02-19 14:25 ` Mel Gorman
2010-02-19 14:25 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 12/12] Do not compact within a preferred zone after a compaction failure Mel Gorman
2010-02-18 18:02 ` Mel Gorman
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