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mm: numa: take THP into account when migrating pages for NUMA balancing

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Wanpeng Li pointed out that numamigrate_isolate_page() assumes that only
one base page is being migrated when in fact it can also be checking
THP.

The consequences are that a migration will be attempted when a target
node is nearly full and fail later.  It's unlikely to be user-visible
but it should be fixed.  While we are there, migrate_balanced_pgdat()
should treat nr_migrate_pages as an unsigned long as it is treated as a
watermark.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Suggested-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Simon Jeons <simon.jeons@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2013-02-22 16:34:27 -08:00 committed by Linus Torvalds
parent 34f0315adb
commit 3abef4e6c2
1 changed files with 4 additions and 2 deletions
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6
mm/migrate.c
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@ -1461,7 +1461,7 @@ int migrate_vmas(struct mm_struct *mm, const nodemask_t *to,
* pages. Currently it only checks the watermarks which crude * pages. Currently it only checks the watermarks which crude
*/ */
static bool migrate_balanced_pgdat(struct pglist_data *pgdat, static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
int nr_migrate_pages) unsigned long nr_migrate_pages)
{ {
int z; int z;
for (z = pgdat->nr_zones - 1; z >= 0; z--) { for (z = pgdat->nr_zones - 1; z >= 0; z--) {
@ -1559,8 +1559,10 @@ int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
{ {
int ret = 0; int ret = 0;
VM_BUG_ON(compound_order(page) && !PageTransHuge(page));
/* Avoid migrating to a node that is nearly full */ /* Avoid migrating to a node that is nearly full */
if (migrate_balanced_pgdat(pgdat, 1)) { if (migrate_balanced_pgdat(pgdat, 1UL << compound_order(page))) {
int page_lru; int page_lru;
if (isolate_lru_page(page)) { if (isolate_lru_page(page)) {