From: Vlastimil Babka <vbabka@suse.cz>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Minchan Kim <minchan@kernel.org>, Mel Gorman <mgorman@suse.de>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Michal Nazarewicz <mina86@mina86.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 06/13] mm, compaction: periodically drop lock and restore IRQs in scanners
Date: Tue, 24 Jun 2014 17:44:13 +0200 [thread overview]
Message-ID: <53A99CCD.5050103@suse.cz> (raw)
In-Reply-To: <20140624153900.GB18289@nhori.bos.redhat.com>
On 06/24/2014 05:39 PM, Naoya Horiguchi wrote:
> On Fri, Jun 20, 2014 at 05:49:36PM +0200, Vlastimil Babka wrote:
>> Compaction scanners regularly check for lock contention and need_resched()
>> through the compact_checklock_irqsave() function. However, if there is no
>> contention, the lock can be held and IRQ disabled for potentially long time.
>>
>> This has been addressed by commit b2eef8c0d0 ("mm: compaction: minimise the
>> time IRQs are disabled while isolating pages for migration") for the migration
>> scanner. However, the refactoring done by commit 748446bb6b ("mm: compaction:
>> acquire the zone->lru_lock as late as possible") has changed the conditions so
>
> You seem to refer to the incorrect commit, maybe you meant commit 2a1402aa044b?
Oops, right. Thanks!
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WARNING: multiple messages have this Message-ID (diff)
From: Vlastimil Babka <vbabka@suse.cz>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Minchan Kim <minchan@kernel.org>, Mel Gorman <mgorman@suse.de>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Michal Nazarewicz <mina86@mina86.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 06/13] mm, compaction: periodically drop lock and restore IRQs in scanners
Date: Tue, 24 Jun 2014 17:44:13 +0200 [thread overview]
Message-ID: <53A99CCD.5050103@suse.cz> (raw)
In-Reply-To: <20140624153900.GB18289@nhori.bos.redhat.com>
On 06/24/2014 05:39 PM, Naoya Horiguchi wrote:
> On Fri, Jun 20, 2014 at 05:49:36PM +0200, Vlastimil Babka wrote:
>> Compaction scanners regularly check for lock contention and need_resched()
>> through the compact_checklock_irqsave() function. However, if there is no
>> contention, the lock can be held and IRQ disabled for potentially long time.
>>
>> This has been addressed by commit b2eef8c0d0 ("mm: compaction: minimise the
>> time IRQs are disabled while isolating pages for migration") for the migration
>> scanner. However, the refactoring done by commit 748446bb6b ("mm: compaction:
>> acquire the zone->lru_lock as late as possible") has changed the conditions so
>
> You seem to refer to the incorrect commit, maybe you meant commit 2a1402aa044b?
Oops, right. Thanks!
next prev parent reply other threads:[~2014-06-24 15:44 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-20 15:49 [PATCH v3 00/13] compaction: balancing overhead and success rates Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-20 15:49 ` [PATCH v3 01/13] mm, THP: don't hold mmap_sem in khugepaged when allocating THP Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-20 17:45 ` Kirill A. Shutemov
2014-06-20 17:45 ` Kirill A. Shutemov
2014-06-23 5:39 ` Zhang Yanfei
2014-06-23 5:39 ` Zhang Yanfei
2014-06-23 9:52 ` Vlastimil Babka
2014-06-23 9:52 ` Vlastimil Babka
2014-06-23 10:40 ` Zhang Yanfei
2014-06-23 10:40 ` Zhang Yanfei
2014-06-20 15:49 ` [PATCH v3 02/13] mm, compaction: defer each zone individually instead of preferred zone Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 2:24 ` Minchan Kim
2014-06-23 2:24 ` Minchan Kim
2014-06-23 6:26 ` Zhang Yanfei
2014-06-23 6:26 ` Zhang Yanfei
2014-06-24 8:23 ` Joonsoo Kim
2014-06-24 8:23 ` Joonsoo Kim
2014-06-24 15:29 ` Vlastimil Babka
2014-06-24 15:29 ` Vlastimil Babka
2014-06-25 1:02 ` Joonsoo Kim
2014-06-25 1:02 ` Joonsoo Kim
2014-06-20 15:49 ` [PATCH v3 03/13] mm, compaction: do not recheck suitable_migration_target under lock Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-20 15:49 ` [PATCH v3 04/13] mm, compaction: move pageblock checks up from isolate_migratepages_range() Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 6:57 ` Zhang Yanfei
2014-06-23 6:57 ` Zhang Yanfei
2014-06-24 4:52 ` Naoya Horiguchi
2014-06-24 4:52 ` Naoya Horiguchi
2014-06-24 15:34 ` Vlastimil Babka
2014-06-24 15:34 ` Vlastimil Babka
2014-06-24 16:58 ` Naoya Horiguchi
2014-06-24 16:58 ` Naoya Horiguchi
2014-06-25 8:50 ` Vlastimil Babka
2014-06-25 8:50 ` Vlastimil Babka
2014-06-25 15:46 ` Naoya Horiguchi
2014-06-25 15:46 ` Naoya Horiguchi
2014-06-24 8:33 ` Joonsoo Kim
2014-06-24 8:33 ` Joonsoo Kim
2014-06-24 15:42 ` Vlastimil Babka
2014-06-24 15:42 ` Vlastimil Babka
2014-06-25 0:53 ` Joonsoo Kim
2014-06-25 0:53 ` Joonsoo Kim
2014-06-25 8:59 ` Vlastimil Babka
2014-06-25 8:59 ` Vlastimil Babka
2014-06-27 5:57 ` Joonsoo Kim
2014-06-27 5:57 ` Joonsoo Kim
2014-06-20 15:49 ` [PATCH v3 05/13] mm, compaction: report compaction as contended only due to lock contention Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 1:39 ` Minchan Kim
2014-06-23 1:39 ` Minchan Kim
2014-06-23 8:55 ` Zhang Yanfei
2014-06-23 8:55 ` Zhang Yanfei
2014-06-23 23:35 ` Minchan Kim
2014-06-23 23:35 ` Minchan Kim
2014-06-24 1:07 ` Zhang Yanfei
2014-06-24 1:07 ` Zhang Yanfei
2014-07-11 8:28 ` Vlastimil Babka
2014-07-11 8:28 ` Vlastimil Babka
2014-07-11 9:38 ` Vlastimil Babka
2014-07-11 9:38 ` Vlastimil Babka
2014-06-20 15:49 ` [PATCH v3 06/13] mm, compaction: periodically drop lock and restore IRQs in scanners Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 2:53 ` Minchan Kim
2014-06-23 2:53 ` Minchan Kim
2014-07-11 12:03 ` Vlastimil Babka
2014-07-11 12:03 ` Vlastimil Babka
2014-06-23 9:13 ` Zhang Yanfei
2014-06-23 9:13 ` Zhang Yanfei
2014-06-24 15:39 ` Naoya Horiguchi
2014-06-24 15:39 ` Naoya Horiguchi
2014-06-24 15:44 ` Vlastimil Babka [this message]
2014-06-24 15:44 ` Vlastimil Babka
2014-06-20 15:49 ` [PATCH v3 07/13] mm, compaction: skip rechecks when lock was already held Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 9:16 ` Zhang Yanfei
2014-06-23 9:16 ` Zhang Yanfei
2014-06-24 18:55 ` Naoya Horiguchi
2014-06-24 18:55 ` Naoya Horiguchi
2014-06-20 15:49 ` [PATCH v3 08/13] mm, compaction: remember position within pageblock in free pages scanner Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 3:04 ` Minchan Kim
2014-06-23 3:04 ` Minchan Kim
2014-06-23 9:17 ` Zhang Yanfei
2014-06-23 9:17 ` Zhang Yanfei
2014-06-24 19:09 ` Naoya Horiguchi
2014-06-24 19:09 ` Naoya Horiguchi
2014-06-20 15:49 ` [PATCH v3 09/13] mm, compaction: skip buddy pages by their order in the migrate scanner Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 3:05 ` Minchan Kim
2014-06-23 3:05 ` Minchan Kim
2014-06-23 9:29 ` Zhang Yanfei
2014-06-23 9:29 ` Zhang Yanfei
2014-06-20 15:49 ` [PATCH v3 10/13] mm: rename allocflags_to_migratetype for clarity Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-24 20:34 ` Naoya Horiguchi
2014-06-24 20:34 ` Naoya Horiguchi
2014-06-20 15:49 ` [PATCH v3 11/13] mm, compaction: pass gfp mask to compact_control Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-23 3:06 ` Minchan Kim
2014-06-23 3:06 ` Minchan Kim
2014-06-23 9:31 ` Zhang Yanfei
2014-06-23 9:31 ` Zhang Yanfei
2014-06-20 15:49 ` [PATCH v3 12/13] mm, compaction: try to capture the just-created high-order freepage Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
2014-06-25 1:57 ` Naoya Horiguchi
2014-06-25 1:57 ` Naoya Horiguchi
2014-06-25 8:57 ` Vlastimil Babka
2014-06-25 8:57 ` Vlastimil Babka
2014-06-20 15:49 ` [RFC PATCH v3 13/13] mm, compaction: do not migrate pages when that cannot satisfy page fault allocation Vlastimil Babka
2014-06-20 15:49 ` Vlastimil Babka
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