From: Joonsoo Kim <js1304@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>, Aaron Lu <aaron.lu@intel.com>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
David Rientjes <rientjes@google.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: [PATCH v2 1/3] mm/compaction: fix invalid free_pfn and compact_cached_free_pfn
Date: Thu, 4 Feb 2016 15:19:33 +0900 [thread overview]
Message-ID: <1454566775-30973-1-git-send-email-iamjoonsoo.kim@lge.com> (raw)
free_pfn and compact_cached_free_pfn are the pointer that remember
restart position of freepage scanner. When they are reset or invalid,
we set them to zone_end_pfn because freepage scanner works in reverse
direction. But, because zone range is defined as [zone_start_pfn,
zone_end_pfn), zone_end_pfn is invalid to access. Therefore, we should
not store it to free_pfn and compact_cached_free_pfn. Instead, we need
to store zone_end_pfn - 1 to them. There is one more thing we should
consider. Freepage scanner scan reversely by pageblock unit. If free_pfn
and compact_cached_free_pfn are set to middle of pageblock, it regards
that sitiation as that it already scans front part of pageblock so we
lose opportunity to scan there. To fix-up, this patch do round_down()
to guarantee that reset position will be pageblock aligned.
Note that thanks to the current pageblock_pfn_to_page() implementation,
actual access to zone_end_pfn doesn't happen until now. But, following
patch will change pageblock_pfn_to_page() so this patch is needed
from now on.
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
mm/compaction.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 585de54..56fa321 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -200,7 +200,8 @@ static void reset_cached_positions(struct zone *zone)
{
zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn;
zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn;
- zone->compact_cached_free_pfn = zone_end_pfn(zone);
+ zone->compact_cached_free_pfn =
+ round_down(zone_end_pfn(zone) - 1, pageblock_nr_pages);
}
/*
@@ -1371,11 +1372,11 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
*/
cc->migrate_pfn = zone->compact_cached_migrate_pfn[sync];
cc->free_pfn = zone->compact_cached_free_pfn;
- if (cc->free_pfn < start_pfn || cc->free_pfn > end_pfn) {
- cc->free_pfn = end_pfn & ~(pageblock_nr_pages-1);
+ if (cc->free_pfn < start_pfn || cc->free_pfn >= end_pfn) {
+ cc->free_pfn = round_down(end_pfn - 1, pageblock_nr_pages);
zone->compact_cached_free_pfn = cc->free_pfn;
}
- if (cc->migrate_pfn < start_pfn || cc->migrate_pfn > end_pfn) {
+ if (cc->migrate_pfn < start_pfn || cc->migrate_pfn >= end_pfn) {
cc->migrate_pfn = start_pfn;
zone->compact_cached_migrate_pfn[0] = cc->migrate_pfn;
zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn;
--
1.9.1
next reply other threads:[~2016-02-04 6:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-04 6:19 Joonsoo Kim [this message]
2016-02-04 6:19 ` [PATCH v2 2/3] mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page Joonsoo Kim
2016-02-10 12:52 ` Vlastimil Babka
2016-02-04 6:19 ` [PATCH v2 3/3] mm/compaction: speed up pageblock_pfn_to_page() when zone is contiguous Joonsoo Kim
2016-02-05 0:49 ` Andrew Morton
2016-02-05 16:11 ` Joonsoo Kim
2016-02-09 17:58 ` Vlastimil Babka
2016-02-09 20:53 ` Andrew Morton
2016-02-10 13:42 ` Vlastimil Babka
2016-02-10 18:58 ` Andrew Morton
2016-02-11 1:58 ` Joonsoo Kim
2016-02-14 10:21 ` zhong jiang
2016-02-15 2:42 ` Joonsoo Kim
2016-02-15 10:06 ` Xishi Qiu
2016-02-15 14:24 ` Joonsoo Kim
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