From: Vasily Averin <vvs@virtuozzo.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
cgroups@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, kernel@openvz.org,
Mel Gorman <mgorman@techsingularity.net>,
Uladzislau Rezki <urezki@gmail.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH memcg] mm/page_alloc.c: avoid statistic update with 0
Date: Fri, 8 Oct 2021 12:24:21 +0300 [thread overview]
Message-ID: <b2371951-bb8a-e62e-8d33-10830bbf6275@virtuozzo.com> (raw)
__alloc_pages_bulk can call __count_zid_vm_events and zone_statistics
with nr_account = 0.
Fixes: 3e23060b2d0b ("mm/page_alloc: batch the accounting updates in the bulk allocator")
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
mm/page_alloc.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 602819a232e5..e67113452ee8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5364,9 +5364,10 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
}
local_unlock_irqrestore(&pagesets.lock, flags);
-
- __count_zid_vm_events(PGALLOC, zone_idx(zone), nr_account);
- zone_statistics(ac.preferred_zoneref->zone, zone, nr_account);
+ if (nr_account) {
+ __count_zid_vm_events(PGALLOC, zone_idx(zone), nr_account);
+ zone_statistics(ac.preferred_zoneref->zone, zone, nr_account);
+ }
if (objcg)
memcg_bulk_post_charge_hook(objcg, nr_pre_charge - nr_account);
--
2.31.1
next reply other threads:[~2021-10-08 9:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-08 9:24 Vasily Averin [this message]
2021-10-08 11:47 ` Vlastimil Babka
2021-10-12 10:42 ` Vasily Averin
2021-10-12 11:09 ` David Hildenbrand
2021-10-12 11:38 ` Mel Gorman
2021-10-12 12:02 ` Chris Down
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