From: Mel Gorman <mgorman@suse.de>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Rik van Riel <riel@redhat.com>, Michal Hocko <mhocko@suse.cz>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>
Subject: [PATCH 2/6] mm: page_alloc: Document why NR_ALLOC_BATCH is always updated
Date: Wed, 18 Dec 2013 19:41:59 +0000 [thread overview]
Message-ID: <1387395723-25391-3-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1387395723-25391-1-git-send-email-mgorman@suse.de>
From: Johannes Weiner <hannes@cmpxchg.org>
Needs-signed-off
---
mm/page_alloc.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f861d02..61e9e8c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1547,7 +1547,15 @@ again:
get_pageblock_migratetype(page));
}
+ /*
+ * All allocations eat into the round-robin batch, even
+ * allocations that are not subject to round-robin placement
+ * themselves. This makes sure that allocations that ARE
+ * subject to round-robin placement compensate for the
+ * allocations that aren't, to have equal placement overall.
+ */
__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
+
__count_zone_vm_events(PGALLOC, zone, 1 << order);
zone_statistics(preferred_zone, zone, gfp_flags);
local_irq_restore(flags);
--
1.8.4
--
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:[~2013-12-18 19:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-18 19:41 [RFC PATCH 0/6] Configurable fair allocation zone policy v4 Mel Gorman
2013-12-18 19:41 ` [PATCH 1/6] mm: page_alloc: exclude unreclaimable allocations from zone fairness policy Mel Gorman
2013-12-18 19:41 ` Mel Gorman [this message]
2013-12-18 19:42 ` [PATCH 3/6] mm: page_alloc: Break out zone page aging distribution into its own helper Mel Gorman
2013-12-18 19:42 ` [PATCH 4/6] mm: page_alloc: Use zone node IDs to approximate locality Mel Gorman
2013-12-18 19:42 ` [PATCH 5/6] mm: Annotate page cache allocations Mel Gorman
2013-12-18 19:42 ` [PATCH 6/6] mm: page_alloc: Make zone distribution page aging policy configurable Mel Gorman
2013-12-18 21:06 ` [RFC PATCH 0/6] Configurable fair allocation zone policy v4 Johannes Weiner
2013-12-19 13:12 ` Michal Hocko
2013-12-19 13:29 ` Mel Gorman
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=1387395723-25391-3-git-send-email-mgorman@suse.de \
--to=mgorman@suse.de \
--cc=akpm@linux-foundation.org \
--cc=dave.hansen@intel.com \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.cz \
--cc=riel@redhat.com \
/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).