From: Mel Gorman <mgorman@suse.de>
To: Nai Xia <nai.xia@gmail.com>
Cc: Shaohua Li <shaohua.li@intel.com>, Linux-MM <linux-mm@kvack.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>, Jan Kara <jack@suse.cz>,
Andy Isaacson <adi@hexapodia.org>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction
Date: Wed, 23 Nov 2011 15:57:07 +0000 [thread overview]
Message-ID: <20111123155707.GP19415@suse.de> (raw)
In-Reply-To: <CAPQyPG58cjEQ8jPFhxGB6URcFoNt=NBC1L+T8aEWVUtPfBNh-Q@mail.gmail.com>
On Wed, Nov 23, 2011 at 11:23:19PM +0800, Nai Xia wrote:
> > <SNIP>
> > This would be functionally equivalent and satisfy THP users
> > but I do not see it as being easier to understand or easier
> > to maintain than updating the API. If someone in the future
> > wanted to use migration without significant stalls without
> > being PF_MEMALLOC, they would need to update the API like this.
> > There are no users like this today but automatic NUMA migration
> > might want to leverage something like MIGRATE_SYNC_LIGHT
> > (http://comments.gmane.org/gmane.linux.kernel.mm/70239)
>
> I see.
> So could I say that might be the time and users for my suggestion of
> page uptodate check to fit into?
>
Yes, at that point checking for PageUptodate may be necessary depending
on their requirements.
--
Mel Gorman
SUSE Labs
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WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Nai Xia <nai.xia@gmail.com>
Cc: Shaohua Li <shaohua.li@intel.com>, Linux-MM <linux-mm@kvack.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>, Jan Kara <jack@suse.cz>,
Andy Isaacson <adi@hexapodia.org>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction
Date: Wed, 23 Nov 2011 15:57:07 +0000 [thread overview]
Message-ID: <20111123155707.GP19415@suse.de> (raw)
In-Reply-To: <CAPQyPG58cjEQ8jPFhxGB6URcFoNt=NBC1L+T8aEWVUtPfBNh-Q@mail.gmail.com>
On Wed, Nov 23, 2011 at 11:23:19PM +0800, Nai Xia wrote:
> > <SNIP>
> > This would be functionally equivalent and satisfy THP users
> > but I do not see it as being easier to understand or easier
> > to maintain than updating the API. If someone in the future
> > wanted to use migration without significant stalls without
> > being PF_MEMALLOC, they would need to update the API like this.
> > There are no users like this today but automatic NUMA migration
> > might want to leverage something like MIGRATE_SYNC_LIGHT
> > (http://comments.gmane.org/gmane.linux.kernel.mm/70239)
>
> I see.
> So could I say that might be the time and users for my suggestion of
> page uptodate check to fit into?
>
Yes, at that point checking for PageUptodate may be necessary depending
on their requirements.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2011-11-23 15:57 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 18:36 [RFC PATCH 0/7] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v4r2 Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-21 18:36 ` [PATCH 1/7] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 16:58 ` Minchan Kim
2011-11-22 16:58 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 2/7] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 17:00 ` Minchan Kim
2011-11-22 17:00 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 3/7] mm: check if we isolated a compound page during lumpy scan Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 17:05 ` Minchan Kim
2011-11-22 17:05 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 4/7] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-21 18:36 ` [PATCH 5/7] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 17:30 ` Minchan Kim
2011-11-22 17:30 ` Minchan Kim
2011-11-23 9:19 ` Mel Gorman
2011-11-23 9:19 ` Mel Gorman
2011-11-21 18:36 ` [PATCH 6/7] mm: page allocator: Limit when direct reclaim is used when compaction is deferred Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 17:50 ` Minchan Kim
2011-11-22 17:50 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2011-11-21 18:36 ` Mel Gorman
2011-11-22 6:56 ` Shaohua Li
2011-11-22 6:56 ` Shaohua Li
2011-11-22 10:14 ` Mel Gorman
2011-11-22 10:14 ` Mel Gorman
2011-11-22 11:54 ` Jan Kara
2011-11-22 11:54 ` Jan Kara
2011-11-22 13:59 ` Nai Xia
2011-11-22 13:59 ` Nai Xia
2011-11-22 15:07 ` Nai Xia
2011-11-22 15:07 ` Nai Xia
2011-11-22 19:13 ` Jan Kara
2011-11-22 19:13 ` Jan Kara
2011-11-22 22:44 ` Nai Xia
2011-11-22 22:44 ` Nai Xia
2011-11-23 11:39 ` Jan Kara
2011-11-23 11:39 ` Jan Kara
2011-11-23 12:20 ` Nai Xia
2011-11-23 12:20 ` Nai Xia
2011-11-23 2:01 ` Nai Xia
2011-11-23 2:01 ` Nai Xia
2011-11-23 2:25 ` Shaohua Li
2011-11-23 2:25 ` Shaohua Li
2011-11-23 11:00 ` Mel Gorman
2011-11-23 11:00 ` Mel Gorman
2011-11-23 12:51 ` Nai Xia
2011-11-23 12:51 ` Nai Xia
2011-11-23 13:05 ` Nai Xia
2011-11-23 13:05 ` Nai Xia
2011-11-23 13:45 ` Mel Gorman
2011-11-23 13:45 ` Mel Gorman
2011-11-23 14:35 ` Nai Xia
2011-11-23 14:35 ` Nai Xia
2011-11-23 15:08 ` Mel Gorman
2011-11-23 15:08 ` Mel Gorman
2011-11-23 15:23 ` Nai Xia
2011-11-23 15:23 ` Nai Xia
2011-11-23 15:57 ` Mel Gorman [this message]
2011-11-23 15:57 ` Mel Gorman
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