From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andrea Arcangeli <aarcange@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
Simon Jeons <simon.jeons@gmail.com>,
Wanpeng Li <liwanp@linux.vnet.ibm.com>,
Hugh Dickins <hughd@google.com>, Mel Gorman <mgorman@suse.de>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/6] mm: numa: Take THP into account when migrating pages for NUMA balancing
Date: Tue, 22 Jan 2013 17:12:38 +0000 [thread overview]
Message-ID: <1358874762-19717-3-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1358874762-19717-1-git-send-email-mgorman@suse.de>
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.
Suggested-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
mm/migrate.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index c387786..73e432d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1459,7 +1459,7 @@ int migrate_vmas(struct mm_struct *mm, const nodemask_t *to,
* pages. Currently it only checks the watermarks which crude
*/
static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
- int nr_migrate_pages)
+ unsigned long nr_migrate_pages)
{
int z;
for (z = pgdat->nr_zones - 1; z >= 0; z--) {
@@ -1557,8 +1557,10 @@ int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
{
int ret = 0;
+ VM_BUG_ON(compound_order(page) && !PageTransHuge(page));
+
/* 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;
if (isolate_lru_page(page)) {
--
1.7.9.2
--
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next prev parent reply other threads:[~2013-01-22 17:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 17:12 [PATCH 0/6] Follow up work on NUMA Balancing Mel Gorman
2013-01-22 17:12 ` [PATCH 1/6] mm: numa: Fix minor typo in numa_next_scan Mel Gorman
2013-01-22 17:12 ` Mel Gorman [this message]
2013-01-22 17:12 ` [PATCH 3/6] mm: numa: Handle side-effects in count_vm_numa_events() for !CONFIG_NUMA_BALANCING Mel Gorman
2013-01-22 22:40 ` Andrew Morton
2013-01-23 9:27 ` Mel Gorman
2013-01-22 17:12 ` [PATCH 4/6] mm: Move page flags layout to separate header Mel Gorman
2013-01-22 17:12 ` [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible Mel Gorman
2013-01-22 22:46 ` Andrew Morton
2013-01-23 13:17 ` Mel Gorman
2013-01-23 21:45 ` KOSAKI Motohiro
2013-01-23 13:18 ` [PATCH] mm: init: Report on last-nid information stored in page->flags Mel Gorman
2013-01-23 14:25 ` [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible Mel Gorman
2013-01-23 21:56 ` Andrew Morton
2013-01-24 10:55 ` [PATCH] mm: Rename page struct field helpers Mel Gorman
2013-01-29 4:39 ` Hugh Dickins
2013-01-30 11:58 ` Mel Gorman
2013-01-30 20:32 ` Hugh Dickins
2013-01-23 15:23 ` [PATCH] mm: uninline page_xchg_last_nid() Mel Gorman
2013-01-22 17:12 ` [PATCH 6/6] mm: numa: Cleanup flow of transhuge page migration Mel Gorman
2013-01-27 21:20 ` Hugh Dickins
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