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From: Mel Gorman <mgorman@suse.de>
To: Stable <stable@vger.kernel.org>
Cc: Linux-MM <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>
Subject: [PATCH 03/34] mm: Reduce the amount of work done when updating min_free_kbytes
Date: Mon, 23 Jul 2012 14:38:16 +0100	[thread overview]
Message-ID: <1343050727-3045-4-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1343050727-3045-1-git-send-email-mgorman@suse.de>

commit 938929f14cb595f43cd1a4e63e22d36cab1e4a1f upstream.

Stable note: Fixes https://bugzilla.novell.com/show_bug.cgi?id=726210 .
	Large machines with 1TB or more of RAM take a long time to boot
	without this patch and may spew out soft lockup warnings.

When min_free_kbytes is updated blocks marked MIGRATE_RESERVE are
updated. Ordinarily, this work is unnoticable as it happens early
in boot. However, on large machines with 1TB of memory, this can take
a considerable time when NUMA distances are taken into account. The bulk
of the work is done by pageblock_is_reserved() which examines the
metadata for almost every page in the system. Currently, we are doing
this far more than necessary as it is only required while there are
still blocks to be marked MIGRATE_RESERVE. This patch significantly
reduces the amount of work done by setup_zone_migrate_reserve()
improving boot times on 1TB machines.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 mm/page_alloc.c |   35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 947a7e9..e568b80 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3418,25 +3418,28 @@ static void setup_zone_migrate_reserve(struct zone *zone)
 		if (page_to_nid(page) != zone_to_nid(zone))
 			continue;
 
-		/* Blocks with reserved pages will never free, skip them. */
-		block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
-		if (pageblock_is_reserved(pfn, block_end_pfn))
-			continue;
-
 		block_migratetype = get_pageblock_migratetype(page);
 
-		/* If this block is reserved, account for it */
-		if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) {
-			reserve--;
-			continue;
-		}
+		/* Only test what is necessary when the reserves are not met */
+		if (reserve > 0) {
+			/* Blocks with reserved pages will never free, skip them. */
+			block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
+			if (pageblock_is_reserved(pfn, block_end_pfn))
+				continue;
 
-		/* Suitable for reserving if this block is movable */
-		if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) {
-			set_pageblock_migratetype(page, MIGRATE_RESERVE);
-			move_freepages_block(zone, page, MIGRATE_RESERVE);
-			reserve--;
-			continue;
+			/* If this block is reserved, account for it */
+			if (block_migratetype == MIGRATE_RESERVE) {
+				reserve--;
+				continue;
+			}
+
+			/* Suitable for reserving if this block is movable */
+			if (block_migratetype == MIGRATE_MOVABLE) {
+				set_pageblock_migratetype(page, MIGRATE_RESERVE);
+				move_freepages_block(zone, page, MIGRATE_RESERVE);
+				reserve--;
+				continue;
+			}
 		}
 
 		/*
-- 
1.7.9.2


WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Stable <stable@vger.kernel.org>
Cc: Linux-MM <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>
Subject: [PATCH 03/34] mm: Reduce the amount of work done when updating min_free_kbytes
Date: Mon, 23 Jul 2012 14:38:16 +0100	[thread overview]
Message-ID: <1343050727-3045-4-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1343050727-3045-1-git-send-email-mgorman@suse.de>

commit 938929f14cb595f43cd1a4e63e22d36cab1e4a1f upstream.

Stable note: Fixes https://bugzilla.novell.com/show_bug.cgi?id=726210 .
	Large machines with 1TB or more of RAM take a long time to boot
	without this patch and may spew out soft lockup warnings.

When min_free_kbytes is updated blocks marked MIGRATE_RESERVE are
updated. Ordinarily, this work is unnoticable as it happens early
in boot. However, on large machines with 1TB of memory, this can take
a considerable time when NUMA distances are taken into account. The bulk
of the work is done by pageblock_is_reserved() which examines the
metadata for almost every page in the system. Currently, we are doing
this far more than necessary as it is only required while there are
still blocks to be marked MIGRATE_RESERVE. This patch significantly
reduces the amount of work done by setup_zone_migrate_reserve()
improving boot times on 1TB machines.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 mm/page_alloc.c |   35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 947a7e9..e568b80 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3418,25 +3418,28 @@ static void setup_zone_migrate_reserve(struct zone *zone)
 		if (page_to_nid(page) != zone_to_nid(zone))
 			continue;
 
-		/* Blocks with reserved pages will never free, skip them. */
-		block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
-		if (pageblock_is_reserved(pfn, block_end_pfn))
-			continue;
-
 		block_migratetype = get_pageblock_migratetype(page);
 
-		/* If this block is reserved, account for it */
-		if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) {
-			reserve--;
-			continue;
-		}
+		/* Only test what is necessary when the reserves are not met */
+		if (reserve > 0) {
+			/* Blocks with reserved pages will never free, skip them. */
+			block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
+			if (pageblock_is_reserved(pfn, block_end_pfn))
+				continue;
 
-		/* Suitable for reserving if this block is movable */
-		if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) {
-			set_pageblock_migratetype(page, MIGRATE_RESERVE);
-			move_freepages_block(zone, page, MIGRATE_RESERVE);
-			reserve--;
-			continue;
+			/* If this block is reserved, account for it */
+			if (block_migratetype == MIGRATE_RESERVE) {
+				reserve--;
+				continue;
+			}
+
+			/* Suitable for reserving if this block is movable */
+			if (block_migratetype == MIGRATE_MOVABLE) {
+				set_pageblock_migratetype(page, MIGRATE_RESERVE);
+				move_freepages_block(zone, page, MIGRATE_RESERVE);
+				reserve--;
+				continue;
+			}
 		}
 
 		/*
-- 
1.7.9.2

--
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  parent reply	other threads:[~2012-07-23 13:47 UTC|newest]

Thread overview: 119+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-23 13:38 [PATCH 00/34] Memory management performance backports for -stable V2 Mel Gorman
2012-07-23 13:38 ` Mel Gorman
2012-07-23 13:38 ` [PATCH 01/34] mm: vmstat: cache align vm_stat Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 02/34] mm: memory hotplug: Check if pages are correctly reserved on a per-section basis Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` Mel Gorman [this message]
2012-07-23 13:38   ` [PATCH 03/34] mm: Reduce the amount of work done when updating min_free_kbytes Mel Gorman
2012-07-24 22:47   ` Greg KH
2012-07-24 22:47     ` Greg KH
2012-07-25  7:57     ` Mel Gorman
2012-07-25  7:57       ` Mel Gorman
2012-07-23 13:38 ` [PATCH 04/34] mm: vmscan: fix force-scanning small targets without swap Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 05/34] vmscan: clear ZONE_CONGESTED for zone with good watermark Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 06/34] vmscan: add shrink_slab tracepoints Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 07/34] vmscan: shrinker->nr updates race and go wrong Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 08/34] vmscan: reduce wind up shrinker->nr when shrinker can't do work Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 09/34] mm: limit direct reclaim for higher order allocations Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 10/34] mm: Abort reclaim/compaction if compaction can proceed Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 11/34] mm: compaction: trivial clean up in acct_isolated() Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 12/34] mm: change isolate mode from #define to bitwise type Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 13/34] mm: compaction: make isolate_lru_page() filter-aware Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 14/34] mm: zone_reclaim: " Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 15/34] mm: migration: clean up unmap_and_move() Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-25 15:45   ` Greg KH
2012-07-25 15:45     ` Greg KH
2012-07-25 16:04     ` Mel Gorman
2012-07-25 16:04       ` Mel Gorman
2012-07-25 18:03       ` Greg KH
2012-07-25 18:03         ` Greg KH
2012-07-23 13:38 ` [PATCH 16/34] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-25 15:47   ` Greg KH
2012-07-25 15:47     ` Greg KH
2012-07-25 16:07     ` Mel Gorman
2012-07-25 16:07       ` Mel Gorman
2012-07-23 13:38 ` [PATCH 17/34] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 18/34] mm: page allocator: Do not call direct reclaim for THP allocations while compaction is deferred Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 19/34] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 20/34] kswapd: avoid unnecessary rebalance after an unsuccessful balancing Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 21/34] kswapd: assign new_order and new_classzone_idx after wakeup in sleeping Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 22/34] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 23/34] mm: vmscan: When reclaiming for compaction, ensure there are sufficient free pages available Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 24/34] mm: vmscan: Do not OOM if aborting reclaim to start compaction Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 25/34] mm: vmscan: Check if reclaim should really abort even if compaction_ready() is true for one zone Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-25 19:51   ` Greg KH
2012-07-25 19:51     ` Greg KH
2012-07-23 13:38 ` [PATCH 26/34] vmscan: promote shared file mapped pages Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 27/34] vmscan: activate executable pages after first usage Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 28/34] mm/vmscan.c: consider swap space when deciding whether to continue reclaim Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 29/34] mm: test PageSwapBacked in lumpy reclaim Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 30/34] mm: vmscan: Do not force kswapd to scan small targets Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-25 19:59   ` Greg KH
2012-07-25 19:59     ` Greg KH
2012-07-25 21:35     ` Mel Gorman
2012-07-25 21:35       ` Mel Gorman
2012-07-25 21:44       ` Greg KH
2012-07-25 21:44         ` Greg KH
2012-07-23 13:38 ` [PATCH 31/34] cpusets: avoid looping when storing to mems_allowed if one node remains set Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 32/34] cpusets: stall when updating mems_allowed for mempolicy or disjoint nodemask Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 33/34] cpuset: mm: Reduce large amounts of memory barrier related damage v3 Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-23 13:38 ` [PATCH 34/34] mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-24  5:58 ` [PATCH 00/34] Memory management performance backports for -stable V2 Mike Galbraith
2012-07-24  5:58   ` Mike Galbraith
2012-07-24  8:10   ` Mel Gorman
2012-07-24  8:10     ` Mel Gorman
2012-07-24 13:18   ` Hillf Danton
2012-07-24 13:18     ` Hillf Danton
2012-07-24 13:27     ` Mel Gorman
2012-07-24 13:27       ` Mel Gorman
2012-07-24 13:34       ` Hillf Danton
2012-07-24 13:34         ` Hillf Danton
2012-07-24 13:53         ` Mel Gorman
2012-07-24 13:53           ` Mel Gorman
2012-07-24 14:11           ` Hillf Danton
2012-07-24 14:11             ` Hillf Danton
2012-07-24 13:52     ` Mike Galbraith
2012-07-24 13:52       ` Mike Galbraith
2012-07-24 14:18       ` Hillf Danton
2012-07-24 14:18         ` Hillf Danton
2012-07-24 14:41         ` Mike Galbraith
2012-07-24 14:41           ` Mike Galbraith
2012-07-25 22:30 ` Greg KH
2012-07-25 22:30   ` Greg KH
2012-07-25 22:48   ` Mel Gorman
2012-07-25 22:48     ` Mel Gorman
2012-07-30  1:13 ` Ben Hutchings
  -- strict thread matches above, loose matches on Subject: below --
2012-07-19 14:36 [PATCH 00/34] Memory management performance backports for -stable Mel Gorman
2012-07-19 14:36 ` [PATCH 03/34] mm: Reduce the amount of work done when updating min_free_kbytes Mel Gorman
2012-07-19 14:36   ` Mel Gorman

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