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author | Vinayak Menon <vinmenon@codeaurora.org> | 2017-07-10 15:49:17 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-10 16:32:32 -0700 |
commit | 727c080f03e7e2e20e868efd461d4f1022b61d9b (patch) | |
tree | 75e1626bf17b0b9680f21225ade3cd4df3413e1e /mm | |
parent | ef77ba5ce6b0e6b657036ee9fc455fc164b215f8 (diff) | |
download | linux-stable-727c080f03e7e2e20e868efd461d4f1022b61d9b.tar.gz linux-stable-727c080f03e7e2e20e868efd461d4f1022b61d9b.tar.bz2 linux-stable-727c080f03e7e2e20e868efd461d4f1022b61d9b.zip |
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
Signed-off-by: Vinayak Menon <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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/page_owner.c | 6 | ||||
-rw-r--r-- | mm/vmstat.c | 24 |
2 files changed, 19 insertions, 11 deletions
diff --git a/mm/page_owner.c b/mm/page_owner.c index 60634dc53a88..0fd9dcf2c5dc 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -281,7 +281,11 @@ void pagetypeinfo_showmixedcount_print(struct seq_file *m, 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; } diff --git a/mm/vmstat.c b/mm/vmstat.c index 744ceaeb42a0..9a4441bbeef2 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1130,7 +1130,7 @@ static void frag_stop(struct seq_file *m, void *arg) * If @assert_populated is true, only use callback for zones that are populated. */ static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, - bool assert_populated, + bool assert_populated, bool nolock, void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) { struct zone *zone; @@ -1141,9 +1141,11 @@ static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, if (assert_populated && !populated_zone(zone)) continue; - spin_lock_irqsave(&zone->lock, flags); + if (!nolock) + spin_lock_irqsave(&zone->lock, flags); print(m, pgdat, zone); - spin_unlock_irqrestore(&zone->lock, flags); + if (!nolock) + spin_unlock_irqrestore(&zone->lock, flags); } } #endif @@ -1166,7 +1168,7 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, static int frag_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; - walk_zones_in_node(m, pgdat, true, frag_show_print); + walk_zones_in_node(m, pgdat, true, false, frag_show_print); return 0; } @@ -1207,7 +1209,7 @@ static int pagetypeinfo_showfree(struct seq_file *m, void *arg) seq_printf(m, "%6d ", order); seq_putc(m, '\n'); - walk_zones_in_node(m, pgdat, true, pagetypeinfo_showfree_print); + walk_zones_in_node(m, pgdat, true, false, pagetypeinfo_showfree_print); return 0; } @@ -1258,7 +1260,8 @@ static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) seq_printf(m, "%12s ", migratetype_names[mtype]); seq_putc(m, '\n'); - walk_zones_in_node(m, pgdat, true, pagetypeinfo_showblockcount_print); + walk_zones_in_node(m, pgdat, true, false, + pagetypeinfo_showblockcount_print); return 0; } @@ -1284,7 +1287,8 @@ static void pagetypeinfo_showmixedcount(struct seq_file *m, pg_data_t *pgdat) seq_printf(m, "%12s ", migratetype_names[mtype]); seq_putc(m, '\n'); - walk_zones_in_node(m, pgdat, true, pagetypeinfo_showmixedcount_print); + walk_zones_in_node(m, pgdat, true, true, + pagetypeinfo_showmixedcount_print); #endif /* CONFIG_PAGE_OWNER */ } @@ -1446,7 +1450,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, static int zoneinfo_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; - walk_zones_in_node(m, pgdat, false, zoneinfo_show_print); + walk_zones_in_node(m, pgdat, false, false, zoneinfo_show_print); return 0; } @@ -1852,7 +1856,7 @@ static int unusable_show(struct seq_file *m, void *arg) if (!node_state(pgdat->node_id, N_MEMORY)) return 0; - walk_zones_in_node(m, pgdat, true, unusable_show_print); + walk_zones_in_node(m, pgdat, true, false, unusable_show_print); return 0; } @@ -1904,7 +1908,7 @@ static int extfrag_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; - walk_zones_in_node(m, pgdat, true, extfrag_show_print); + walk_zones_in_node(m, pgdat, true, false, extfrag_show_print); return 0; } |