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authorDavid Rientjes <rientjes@google.com>2014-08-06 16:07:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:20 -0700
commit14a4e2141e24304fff2c697be6382ffb83888185 (patch)
treea99c001aa3fbb184a0457a7673782d8b55bd659c /mm/huge_memory.c
parentfed400a181447ba975d40e1df5e0d555eae51795 (diff)
downloadblackbird-op-linux-14a4e2141e24304fff2c697be6382ffb83888185.tar.gz
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mm, thp: only collapse hugepages to nodes with affinity for zone_reclaim_mode
Commit 9f1b868a13ac ("mm: thp: khugepaged: add policy for finding target node") improved the previous khugepaged logic which allocated a transparent hugepages from the node of the first page being collapsed. However, it is still possible to collapse pages to remote memory which may suffer from additional access latency. With the current policy, it is possible that 255 pages (with PAGE_SHIFT == 12) will be collapsed remotely if the majority are allocated from that node. When zone_reclaim_mode is enabled, it means the VM should make every attempt to allocate locally to prevent NUMA performance degradation. In this case, we do not want to collapse hugepages to remote nodes that would suffer from increased access latency. Thus, when zone_reclaim_mode is enabled, only allow collapsing to nodes with RECLAIM_DISTANCE or less. There is no functional change for systems that disable zone_reclaim_mode. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Bob Liu <bob.liu@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 24e354c2b59e..3630d577e987 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2233,6 +2233,30 @@ static void khugepaged_alloc_sleep(void)
static int khugepaged_node_load[MAX_NUMNODES];
+static bool khugepaged_scan_abort(int nid)
+{
+ int i;
+
+ /*
+ * If zone_reclaim_mode is disabled, then no extra effort is made to
+ * allocate memory locally.
+ */
+ if (!zone_reclaim_mode)
+ return false;
+
+ /* If there is a count for this node already, it must be acceptable */
+ if (khugepaged_node_load[nid])
+ return false;
+
+ for (i = 0; i < MAX_NUMNODES; i++) {
+ if (!khugepaged_node_load[i])
+ continue;
+ if (node_distance(nid, i) > RECLAIM_DISTANCE)
+ return true;
+ }
+ return false;
+}
+
#ifdef CONFIG_NUMA
static int khugepaged_find_target_node(void)
{
@@ -2545,6 +2569,8 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
* hit record.
*/
node = page_to_nid(page);
+ if (khugepaged_scan_abort(node))
+ goto out_unmap;
khugepaged_node_load[node]++;
VM_BUG_ON_PAGE(PageCompound(page), page);
if (!PageLRU(page) || PageLocked(page) || !PageAnon(page))
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