mm: avoid taking zone lock in pagetypeinfo_showmixed()
pagetypeinfo_showmixedcount_print is found to take a lot of time to
complete and it does this holding the zone lock and disabling interrupts.
In some cases it is found to take more than a second (On a 2.4GHz,8Gb
RAM,arm64 cpu). Avoid taking the zone lock similar to what is done by
read_page_owner, which means possibility of inaccurate results.
Link: http://lkml.kernel.org/r/1498045643-12257-1-git-send-email-vinmenon@codeaurora.org
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: zhongjiang <zhongjiang@huawei.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Git-commit: a94b5fd913ac55a32fe05dfba21eb6af0e539781
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Change-Id: I11ec4a3a445d602e47fcc18a3e40480b74ad98af
[vinmenon@codeaurora.org: fix trivial merge conflicts]
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
diff --git a/mm/page_owner.c b/mm/page_owner.c
index d2db436..65e24fb 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -285,7 +285,11 @@
continue;
if (PageBuddy(page)) {
- pfn += (1UL << page_order(page)) - 1;
+ unsigned long freepage_order;
+
+ freepage_order = page_order_unsafe(page);
+ if (freepage_order < MAX_ORDER)
+ pfn += (1UL << freepage_order) - 1;
continue;
}