From: Jia He <hejianet@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Taku Izumi <izumi.taku@jp.fujitsu.com>,
Jia He <hejianet@gmail.com>
Subject: [PATCH RFC 1/1] mm, page_alloc: fix incorrect zone_statistics data
Date: Mon, 12 Dec 2016 13:59:07 +0800 [thread overview]
Message-ID: <1481522347-20393-2-git-send-email-hejianet@gmail.com> (raw)
In-Reply-To: <1481522347-20393-1-git-send-email-hejianet@gmail.com>
In commit b9f00e147f27 ("mm, page_alloc: reduce branches in
zone_statistics"), it reconstructed codes to reduce the branch miss rate.
Compared with the original logic, it assumed if !(flag & __GFP_OTHER_NODE)
z->node would not be equal to preferred_zone->node. That seems to be
incorrect.
Fixes: commit b9f00e147f27 ("mm, page_alloc: reduce branches in
zone_statistics")
Signed-off-by: Jia He <hejianet@gmail.com>
---
mm/page_alloc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6de9440..474757e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2568,6 +2568,9 @@ static inline void zone_statistics(struct zone *preferred_zone, struct zone *z,
if (z->node == local_nid) {
__inc_zone_state(z, NUMA_HIT);
__inc_zone_state(z, local_stat);
+ } else if (z->node == preferred_zone->node) {
+ __inc_zone_state(z, NUMA_HIT);
+ __inc_zone_state(z, NUMA_OTHER);
} else {
__inc_zone_state(z, NUMA_MISS);
__inc_zone_state(preferred_zone, NUMA_FOREIGN);
--
2.5.5
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-12-12 5:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-12 5:59 [PATCH RFC 0/1] mm, page_alloc: fix incorrect zone_statistics data Jia He
2016-12-12 5:59 ` Jia He [this message]
2016-12-20 9:18 ` [PATCH RFC 1/1] " Michal Hocko
2016-12-20 13:10 ` Mel Gorman
2016-12-20 13:26 ` Michal Hocko
2016-12-20 14:28 ` Mel Gorman
2016-12-20 14:35 ` Michal Hocko
2016-12-20 14:49 ` Vlastimil Babka
2016-12-20 14:54 ` Mel Gorman
2016-12-21 7:57 ` Michal Hocko
2016-12-21 8:06 ` [PATCH 1/2] mm: fix remote numa hits statistics Michal Hocko
2016-12-21 8:06 ` [PATCH 2/2] mm: get rid of __GFP_OTHER_NODE Michal Hocko
2017-01-02 14:18 ` Vlastimil Babka
2016-12-29 11:46 ` [PATCH 1/2] mm: fix remote numa hits statistics Mel Gorman
2016-12-29 12:28 ` Michal Hocko
2017-01-02 14:16 ` Vlastimil Babka
2017-01-02 14:46 ` Michal Hocko
2017-01-02 15:07 ` Vlastimil Babka
2016-12-20 14:42 ` [PATCH RFC 1/1] mm, page_alloc: fix incorrect zone_statistics data Mel Gorman
2016-12-20 15:13 ` Vlastimil Babka
2016-12-21 3:01 ` hejianet
2016-12-20 12:31 ` Mel Gorman
2016-12-21 3:07 ` hejianet
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1481522347-20393-2-git-send-email-hejianet@gmail.com \
--to=hejianet@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=hannes@cmpxchg.org \
--cc=iamjoonsoo.kim@lge.com \
--cc=izumi.taku@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@techsingularity.net \
--cc=mhocko@suse.com \
--cc=vbabka@suse.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).