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thp: skip transhuge pages in ksm for now 

Skip transhuge pages in ksm for now.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:47:00 -08:00 committed by Linus Torvalds
parent b15d00b6af
commit 21ae5b0175
1 changed files with 15 additions and 4 deletions
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19
mm/ksm.c
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@ -430,7 +430,7 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
page = follow_page(vma, addr, FOLL_GET);
if (IS_ERR_OR_NULL(page))
goto out;
if (PageAnon(page)) {
if (PageAnon(page) && !PageTransCompound(page)) {
flush_anon_page(vma, page, addr);
flush_dcache_page(page);
} else {
@ -1279,7 +1279,19 @@ next_mm:
if (ksm_test_exit(mm))
break;
*page = follow_page(vma, ksm_scan.address, FOLL_GET);
if (!IS_ERR_OR_NULL(*page) && PageAnon(*page)) {
if (IS_ERR_OR_NULL(*page)) {
ksm_scan.address += PAGE_SIZE;
cond_resched();
continue;
}
if (PageTransCompound(*page)) {
put_page(*page);
ksm_scan.address &= HPAGE_PMD_MASK;
ksm_scan.address += HPAGE_PMD_SIZE;
cond_resched();
continue;
}
if (PageAnon(*page)) {
flush_anon_page(vma, *page, ksm_scan.address);
flush_dcache_page(*page);
rmap_item = get_next_rmap_item(slot,
@ -1293,8 +1305,7 @@ next_mm:
up_read(&mm->mmap_sem);
return rmap_item;
}
if (!IS_ERR_OR_NULL(*page))
put_page(*page);
put_page(*page);
ksm_scan.address += PAGE_SIZE;
cond_resched();
}