Subject: [merged] mm-page_alloc-exclude-unreclaimable-allocations-from-zone-fairness-policy.patch removed from -mm tree
To: hannes@xxxxxxxxxxx,dave.hansen@xxxxxxxxx,mgorman@xxxxxxx,riel@xxxxxxxxxx,stable@xxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 19 Dec 2013 11:53:51 -0800
The patch titled
Subject: mm: page_alloc: exclude unreclaimable allocations from zone fairness policy
has been removed from the -mm tree. Its filename was
mm-page_alloc-exclude-unreclaimable-allocations-from-zone-fairness-policy.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: page_alloc: exclude unreclaimable allocations from zone fairness policy
Dave Hansen noted a regression in a microbenchmark that loops around
open() and close() on an 8-node NUMA machine and bisected it down to
81c0a2bb515f ("mm: page_alloc: fair zone allocator policy"). That change
forces the slab allocations of the file descriptor to spread out to all 8
nodes, causing remote references in the page allocator and slab.
The round-robin policy is only there to provide fairness among memory
allocations that are reclaimed involuntarily based on pressure in each
zone. It does not make sense to apply it to unreclaimable kernel
allocations that are freed manually, in this case instantly after the
allocation, and incur the remote reference costs twice for no reason.
Only round-robin allocations that are usually freed through page reclaim
or slab shrinking.
Bisected by Dave Hansen.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-page_alloc-exclude-unreclaimable-allocations-from-zone-fairness-policy mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-exclude-unreclaimable-allocations-from-zone-fairness-policy
+++ a/mm/page_alloc.c
@@ -1920,7 +1920,8 @@ zonelist_scan:
* back to remote zones that do not partake in the
* fairness round-robin cycle of this zonelist.
*/
- if (alloc_flags & ALLOC_WMARK_LOW) {
+ if ((alloc_flags & ALLOC_WMARK_LOW) &&
+ (gfp_mask & GFP_MOVABLE_MASK)) {
if (zone_page_state(zone, NR_ALLOC_BATCH) <= 0)
continue;
if (zone_reclaim_mode &&
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
origin.patch
memcg-fix-memcg_size-calculation.patch
mm-memcg-avoid-oom-notification-when-current-needs-access-to-memory-reserves.patch
proc-meminfo-provide-estimated-available-memory.patch
mm-mempolicy-remove-unneeded-functions-for-uma-configs.patch
mm-memblock-debug-correct-displaying-of-upper-memory-boundary.patch
x86-get-pg_data_ts-memory-from-other-node.patch
memblock-numa-introduce-flags-field-into-memblock.patch
memblock-mem_hotplug-introduce-memblock_hotplug-flag-to-mark-hotpluggable-regions.patch
memblock-make-memblock_set_node-support-different-memblock_type.patch
acpi-numa-mem_hotplug-mark-hotpluggable-memory-in-memblock.patch
acpi-numa-mem_hotplug-mark-all-nodes-the-kernel-resides-un-hotpluggable.patch
memblock-mem_hotplug-make-memblock-skip-hotpluggable-regions-if-needed.patch
x86-numa-acpi-memory-hotplug-make-movable_node-have-higher-priority.patch
memcg-fix-kmem_account_flags-check-in-memcg_can_account_kmem.patch
memcg-make-memcg_update_cache_sizes-static.patch
memcg-oom-lock-mem_cgroup_print_oom_info.patch
memcg-do-not-use-vmalloc-for-mem_cgroup-allocations.patch
mm-remove-bug_on-from-mlock_vma_page.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch
linux-next.patch
debugging-keep-track-of-page-owners.patch
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