The patch titled
Subject: memcg: page_alloc: skip bulk allocator for __GFP_ACCOUNT
has been added to the -mm tree. Its filename is
memcg-page_alloc-skip-bulk-allocator-for-__gfp_account.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/memcg-page_alloc-skip-bulk-allocator-for-__gfp_account.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/memcg-page_alloc-skip-bulk-allocator-for-__gfp_account.patch
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------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: memcg: page_alloc: skip bulk allocator for __GFP_ACCOUNT
The commit 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in
__vmalloc_area_node()") switched to bulk page allocator for order 0
allocation backing vmalloc. However bulk page allocator does not support
__GFP_ACCOUNT allocations and there are several users of
kvmalloc(__GFP_ACCOUNT).
For now make __GFP_ACCOUNT allocations bypass bulk page allocator. In
future if there is workload that can be significantly improved with the
bulk page allocator with __GFP_ACCCOUNT support, we can revisit the
decision.
Link: https://lkml.kernel.org/r/20211013194338.1804247-1-shakeelb@xxxxxxxxxx
Fixes: 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in __vmalloc_area_node()")
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Uladzislau Rezki <urezki@xxxxxxxxx>
Cc: Vasily Averin <vvs@xxxxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/page_alloc.c~memcg-page_alloc-skip-bulk-allocator-for-__gfp_account
+++ a/mm/page_alloc.c
@@ -5208,6 +5208,10 @@ unsigned long __alloc_pages_bulk(gfp_t g
unsigned int alloc_flags = ALLOC_WMARK_LOW;
int nr_populated = 0, nr_account = 0;
+ /* Bulk allocator does not support memcg accounting. */
+ if (unlikely(gfp & __GFP_ACCOUNT))
+ goto out;
+
/*
* Skip populated array elements to determine if any pages need
* to be allocated before disabling IRQs.
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
memcg-flush-stats-only-if-updated.patch
memcg-unify-memcg-stat-flushing.patch
memcg-page_alloc-skip-bulk-allocator-for-__gfp_account.patch
