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authorMel Gorman <mgorman@suse.de>2012-10-08 16:32:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:50 +0900
commit753341a4b85ff337487b9959c71c529f522004f4 (patch)
tree6a705fd73dd599e7eeb58cb06e84c86c07c03a64 /mm/page_alloc.c
parentf40d1e42bb988d2a26e8e111ea4c4c7bac819b7e (diff)
downloadlinux-753341a4b85ff337487b9959c71c529f522004f4.tar.bz2
revert "mm: have order > 0 compaction start off where it left"
This reverts commit 7db8889ab05b ("mm: have order > 0 compaction start off where it left") and commit de74f1cc ("mm: have order > 0 compaction start near a pageblock with free pages"). These patches were a good idea and tests confirmed that they massively reduced the amount of scanning but the implementation is complex and tricky to understand. A later patch will cache what pageblocks should be skipped and reimplements the concept of compact_cached_free_pfn on top for both migration and free scanners. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Rik van Riel <riel@redhat.com> Cc: Richard Davies <richard@arachsys.com> Cc: Shaohua Li <shli@kernel.org> Cc: Avi Kivity <avi@redhat.com> Acked-by: Rafael Aquini <aquini@redhat.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ca002b39b9b4..628968c1ccf4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4490,11 +4490,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
zone->spanned_pages = size;
zone->present_pages = realsize;
-#if defined CONFIG_COMPACTION || defined CONFIG_CMA
- zone->compact_cached_free_pfn = zone->zone_start_pfn +
- zone->spanned_pages;
- zone->compact_cached_free_pfn &= ~(pageblock_nr_pages-1);
-#endif
#ifdef CONFIG_NUMA
zone->node = nid;
zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio)