Vlastimil Babka 48131e03ca
mm, proc: reduce cost of /proc/pid/smaps for unpopulated shmem mappings ...
Following the previous patch, further reduction of /proc/pid/smaps cost
is possible for private writable shmem mappings with unpopulated areas
where the page walk invokes the .pte_hole function. We can use radix
tree iterator for each such area instead of calling find_get_entry() in
a loop. This is possible at the extra maintenance cost of introducing
another shmem function shmem_partial_swap_usage().
To demonstrate the diference, I have measured this on a process that
creates a private writable 2GB mapping of a partially swapped out
/dev/shm/file (which cannot employ the optimizations from the prvious
patch) and doesn't populate it at all. I time how long does it take to
cat /proc/pid/smaps of this process 100 times.
Before this patch:
real 0m3.831s
user 0m0.180s
sys 0m3.212s
After this patch:
real 0m1.176s
user 0m0.180s
sys 0m0.684s
The time is similar to the case where a radix tree iterator is employed
on the whole mapping.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz >
Cc: Hugh Dickins <hughd@google.com >
Cc: Jerome Marchand <jmarchan@redhat.com >
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru >
Acked-by: Michal Hocko <mhocko@suse.com >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
2016-01-14 16:00:49 -08:00
2015-12-13 19:59:48 -08:00
2015-12-14 10:11:09 -08:00
2015-10-09 07:49:01 -07:00
2015-11-02 23:37:46 +01:00
2015-10-01 12:48:11 -07:00
2015-06-25 11:49:31 +03:00
2015-10-17 21:22:08 -07:00
2015-09-30 19:22:50 +09:00
2015-10-07 18:08:15 +01:00
2015-12-11 16:56:16 +01:00
2015-10-16 22:11:16 +02:00
2015-10-20 18:10:25 +02:00
2015-12-22 17:04:56 +00:00
2015-09-27 17:33:59 -07:00
2015-12-29 10:08:45 +01:00
2015-10-23 15:57:27 -04:00
2016-01-13 10:13:36 -08:00
2015-12-17 22:08:28 -05:00
2016-01-11 17:48:53 -05:00
2016-01-05 18:04:58 +01:00
2016-01-07 09:55:39 -08:00
2015-12-28 18:43:15 +01:00
2015-09-18 21:57:43 +02:00
2015-09-18 21:57:35 +02:00
2015-09-18 21:57:43 +02:00
2015-09-18 21:57:43 +02:00
2015-11-16 15:41:49 +00:00
2015-12-21 14:26:28 +05:30
2015-10-27 11:24:23 +01:00
2016-01-13 11:38:27 -08:00
2015-09-23 17:15:27 +02:00
2015-12-17 22:08:28 -05:00
2015-10-16 17:57:33 +01:00
2015-09-23 09:51:25 +02:00
2015-12-11 19:34:39 -05:00
2016-01-11 16:48:35 +00:00
2015-12-16 16:36:25 +02:00
2015-11-11 20:11:28 -08:00
2016-01-13 09:26:40 -08:00
2016-01-12 01:10:19 +01:00
2015-09-17 10:09:37 -05:00
2016-01-04 16:19:57 +00:00
2015-08-05 13:38:07 +01:00
2015-01-28 18:45:23 -05:00
2015-08-03 12:01:54 -04:00
2015-07-23 18:00:42 -07:00
2015-10-06 12:33:14 +02:00
2015-11-03 17:22:17 -08:00
2015-11-04 08:23:51 -05:00
2015-08-20 14:10:23 -07:00
2015-10-12 10:31:12 -06:00
2015-11-05 14:51:32 -08:00
2015-06-23 15:47:35 +01:00
2016-01-09 08:39:04 -08:00
2015-07-27 15:01:05 +02:00
2015-06-21 21:55:33 +02:00
2015-08-19 14:26:02 -07:00
2015-08-05 09:38:08 +02:00
2015-12-09 10:35:16 -08:00
2015-11-11 09:37:34 -07:00
2015-10-27 15:04:56 +09:00
2015-11-07 10:40:47 -07:00
2015-12-28 13:07:07 -07:00
2015-09-29 13:37:04 -07:00
2015-12-06 12:46:31 +01:00
2015-11-25 12:14:09 -05:00
2015-11-25 11:35:14 -05:00
2015-11-11 02:19:33 -05:00
2015-12-03 10:24:08 -05:00
2016-01-12 19:20:32 -08:00
2016-01-12 19:20:32 -08:00
2015-10-26 12:36:55 -07:00
2015-07-17 16:39:53 -07:00
2015-09-14 11:00:55 +02:00
2015-11-25 22:28:30 +01:00
2015-10-23 17:55:10 +09:00
2015-11-05 19:34:48 -08:00
2015-07-17 16:39:53 -07:00
2015-11-06 17:50:42 -08:00
2015-06-25 17:00:38 -07:00
2015-12-04 10:33:41 +01:00
2015-12-07 00:02:05 +00:00
2016-01-04 12:31:46 +01:00
2015-06-25 17:00:38 -07:00
2015-11-24 09:56:43 +01:00
2015-12-04 10:34:45 +01:00
2015-10-07 17:54:09 +01:00
2015-10-15 00:21:07 +02:00
2015-07-15 13:30:38 +01:00
2015-10-07 16:02:49 -07:00
2015-07-22 09:58:02 +02:00
2016-01-01 03:49:51 +01:00
2015-08-28 15:14:54 +02:00
2015-11-06 17:50:42 -08:00
2015-09-04 16:54:41 -07:00
2015-08-17 16:53:53 +08:00
2015-09-08 15:35:28 -07:00
2015-11-16 09:27:32 +05:30
2016-01-14 16:00:49 -08:00
2015-10-09 07:49:02 -07:00
2015-10-18 10:14:39 -07:00
2015-12-30 13:01:03 -05:00
2015-11-02 13:14:44 -08:00
2015-09-11 14:23:29 +09:00
2015-10-31 19:05:59 -04:00
2015-12-09 01:25:01 +01:00
2015-10-15 13:22:35 +01:00
2015-10-23 17:55:10 +09:00
2015-10-15 16:41:04 +02:00
2015-11-06 17:50:42 -08:00
2016-01-06 15:17:47 +05:30
2015-09-08 15:35:28 -07:00
2015-06-12 11:33:52 +02:00
2015-06-25 09:06:57 +02:00
2015-11-18 16:27:46 -05:00
2015-12-11 16:56:40 +01:00
2015-10-28 12:28:06 +01:00
2015-06-10 08:01:20 -06:00
2015-12-11 11:05:57 -08:00
2016-01-06 16:31:56 -05:00
2015-10-16 08:30:09 +09:00
2015-12-14 18:58:42 -08:00
2015-10-04 11:36:07 +01:00
2015-11-10 09:33:06 -08:00
2015-10-31 16:12:10 -07:00
2015-10-30 01:47:27 -04:00
2016-01-08 21:40:34 -05:00
2015-06-24 17:49:45 -07:00
2016-01-13 19:15:14 -08:00
2015-08-14 16:50:36 -07:00
2015-08-07 22:59:34 -05:00
2016-01-14 16:00:49 -08:00
2016-01-12 20:04:15 -08:00
2015-11-04 18:10:13 -08:00
2015-09-04 16:54:41 -07:00
2015-10-09 07:48:59 -07:00
2016-01-09 22:42:31 -08:00
2016-01-14 16:00:49 -08:00
2015-11-18 16:17:42 -05:00
2015-12-05 17:41:42 -05:00
2015-07-13 14:18:07 -07:00
2015-11-05 09:51:50 -08:00
2015-11-09 15:11:24 -08:00
2015-06-19 15:18:28 +02:00
2015-09-08 15:35:28 -07:00
2015-11-06 17:50:42 -08:00
2016-01-14 16:00:49 -08:00
2015-12-21 13:07:56 -08:00
2012-10-06 13:14:36 +02:00
2015-10-20 17:47:45 +02:00
2015-08-24 14:05:19 +02:00
2014-06-06 16:08:13 -07:00
2015-10-13 10:34:46 +02:00
2015-09-24 20:42:37 +02:00
2015-09-23 14:35:58 -07:00
2015-10-23 05:44:28 -07:00
2015-06-23 06:14:04 -07:00
2015-11-20 11:31:26 -05:00
2015-12-03 11:49:26 -05:00
2015-12-15 16:50:20 -05:00
2015-09-29 16:27:47 -07:00
2015-12-15 23:26:51 -05:00
2015-10-09 07:49:05 -07:00
2015-12-04 10:34:46 +01:00
2015-07-05 23:59:14 -04:00
2015-10-13 23:30:31 -07:00
2015-10-15 15:35:32 +01:00
2015-10-27 08:36:08 +09:00
2015-12-08 12:53:29 +01:00
2015-10-15 00:21:07 +02:00
2015-10-15 00:21:07 +02:00
2015-08-10 23:07:05 -04:00
2015-08-27 19:40:58 -04:00
2015-11-04 11:30:57 -08:00
2015-10-22 00:00:49 +02:00
2015-10-16 22:18:51 +02:00
2015-10-04 12:46:06 +01:00
2015-09-03 15:02:28 -05:00
2015-12-02 23:37:16 -05:00
2006-04-26 12:56:16 +01:00
2015-10-11 11:33:42 +02:00
2015-10-01 15:06:43 +02:00
2015-10-01 02:18:38 +02:00
2015-12-14 10:03:46 +01:00
2015-12-29 10:08:45 +01:00
2015-09-16 15:47:51 +02:00
2015-06-25 12:06:45 +02:00
2015-10-30 10:13:26 +01:00
2015-10-18 17:02:56 -04:00
2015-09-01 14:04:50 -07:00
2015-11-23 09:44:58 +01:00
2015-08-22 14:54:55 +02:00
2015-11-09 15:11:24 -08:00
2015-12-19 11:07:01 +01:00
2015-11-20 15:55:52 -05:00
2015-12-19 11:07:01 +01:00
2015-10-21 15:18:36 +01:00
2015-10-21 15:18:36 +01:00
2015-07-28 08:50:42 +01:00
2015-12-12 10:15:34 -08:00
2015-09-10 13:29:01 -07:00
2015-10-04 11:46:16 +01:00
2015-08-04 10:16:54 +02:00
2015-11-28 19:33:29 -08:00
2015-09-04 16:54:41 -07:00
2016-01-08 19:04:36 +01:00
2015-10-01 15:06:46 +02:00
2015-11-25 17:24:23 +01:00
2016-01-04 09:57:40 +01:00
2015-06-19 10:03:12 +02:00
2016-01-11 19:33:59 -08:00
2016-01-09 08:39:03 -08:00
2015-12-07 09:14:19 -07:00
2015-11-23 10:37:35 -08:00
2015-11-23 10:37:35 -08:00
2015-12-04 12:34:33 -08:00
2015-08-12 11:59:08 +02:00
2015-11-23 09:44:58 +01:00
2015-07-13 13:31:58 -04:00
2015-07-28 13:18:19 +10:00
2015-06-11 22:19:45 +05:30
2015-08-10 14:29:27 +05:30
2015-11-17 15:25:43 -05:00
2015-11-10 12:06:16 +01:00
2016-01-07 14:31:27 -05:00
2015-09-20 19:31:10 -07:00
2016-01-14 16:00:49 -08:00
2016-01-14 16:00:49 -08:00
2015-10-23 14:19:58 +01:00
2016-01-14 16:00:49 -08:00
2015-10-04 12:46:06 +01:00
2015-09-09 17:19:14 -07:00
2015-10-27 18:55:31 -07:00
2015-11-06 17:50:42 -08:00
2015-06-24 17:49:41 -07:00
2015-11-06 17:50:42 -08:00
2015-12-18 14:25:40 -08:00
2015-07-17 16:39:53 -07:00
2015-09-10 13:29:01 -07:00
2016-01-14 16:00:49 -08:00
2015-12-14 19:15:05 -08:00
2015-07-05 23:59:14 -04:00
2015-11-06 17:50:42 -08:00
2015-10-20 22:10:45 +08:00
2015-07-21 10:39:05 -07:00
2015-11-30 15:26:22 -05:00
2014-01-27 21:02:39 -08:00
2015-12-16 15:29:44 +00:00
2015-10-17 21:11:29 -07:00
2016-01-09 03:07:52 -05:00
2015-06-25 04:20:04 -04:00
2015-12-01 15:45:05 -05:00
2015-12-15 16:50:20 -05:00
2016-01-11 23:28:44 -05:00
2015-09-17 17:18:37 -07:00
2015-06-18 21:14:31 +02:00
2015-11-06 19:33:12 +01:00
2015-09-29 20:21:32 +02:00
2015-09-30 01:45:03 -05:00
2015-10-16 18:45:36 +02:00
2015-12-15 23:25:20 -05:00
2015-12-07 23:12:00 -05:00
2015-10-15 16:08:18 -04:00
2015-12-08 22:41:55 -05:00
2015-06-10 18:32:40 -04:00
2015-11-23 21:57:44 -05:00
2015-11-05 19:34:48 -08:00
2015-09-07 15:17:08 -04:00
2015-09-07 15:17:09 -04:00
2015-10-09 10:40:37 -06:00
2015-08-05 13:43:44 -07:00
2015-08-05 13:43:12 -07:00
2015-11-10 17:27:12 -06:00
2015-07-27 08:23:27 -05:00
2015-11-16 09:03:21 +05:30
2015-07-01 19:40:18 -07:00
2015-10-16 22:49:26 +02:00
2015-06-24 11:18:48 +10:00
2015-12-09 09:23:28 -06:00
2015-11-12 11:50:33 -08:00
2015-08-25 11:29:55 -05:00
2015-11-10 17:27:12 -06:00
2015-09-01 09:59:20 +10:00
2015-12-18 11:17:26 +05:30
2015-10-08 05:26:36 -07:00
2015-09-08 15:35:28 -07:00
2015-05-08 12:27:59 +02:00
2015-11-05 19:34:48 -08:00
2015-09-10 13:29:01 -07:00
2015-09-10 13:29:01 -07:00
2015-07-17 16:39:54 -07:00
2015-11-06 17:50:42 -08:00
2015-09-08 15:35:28 -07:00
2015-11-06 17:50:42 -08:00
2015-11-06 17:50:42 -08:00
2015-07-17 16:39:53 -07:00
2015-12-03 14:17:51 -05:00
2015-10-16 22:18:51 +02:00
2015-08-13 15:59:58 -05:00
2015-12-21 13:49:32 +00:00
2015-07-14 17:43:56 -04:00
2015-11-16 10:40:50 -05:00
2015-10-06 11:25:31 -07:00
2015-11-16 10:50:25 -05:00
2015-11-23 09:21:03 +01:00
2016-01-14 16:00:49 -08:00
2015-08-31 14:48:02 -07:00
2016-01-07 14:31:27 -05:00
2015-11-30 15:26:22 -05:00
2016-01-12 20:25:09 -08:00
2015-10-28 04:33:04 +01:00
2015-12-10 23:08:51 +01:00
2015-07-28 08:50:41 +01:00
2015-12-21 03:11:12 +01:00
2015-03-18 15:54:27 +01:00
2015-10-14 02:17:34 +02:00
2015-10-09 17:00:32 -04:00
2015-09-10 13:29:01 -07:00
2015-12-06 21:25:17 -05:00
2015-06-10 16:15:54 +02:00
2016-01-02 00:29:35 +01:00
2015-10-01 09:59:16 -07:00
2015-10-21 14:46:56 -06:00
2015-10-06 17:08:19 +02:00
2015-09-10 13:29:01 -07:00
2016-01-01 02:09:51 +01:00
2015-11-23 09:44:58 +01:00
2015-10-02 14:35:16 +01:00
2015-10-22 08:59:18 -07:00
2015-11-03 11:08:22 -05:00
2015-07-15 11:52:52 -07:00
2015-11-10 13:06:16 +01:00
2015-10-30 11:18:05 +09:00
2015-10-14 14:51:22 -05:00
2015-07-23 20:59:10 +02:00
2015-10-08 05:26:38 -07:00
2015-11-06 17:50:42 -08:00
2015-10-06 11:25:45 -07:00
2015-12-07 17:02:54 -08:00
2015-12-07 17:02:54 -08:00
2015-12-07 17:01:31 -08:00
2015-12-07 17:01:31 -08:00
2016-01-05 19:07:17 +00:00
2015-06-17 09:57:12 +03:00
2015-09-01 09:56:58 +02:00
2015-12-17 22:08:28 -05:00
2015-11-02 14:23:38 -05:00
2015-09-04 16:54:41 -07:00
2015-10-16 15:32:18 -07:00
2015-06-25 01:13:43 +02:00
2016-01-10 22:13:15 -05:00
2015-08-24 14:28:01 -06:00
2015-12-15 09:41:09 +01:00
2016-01-12 18:57:02 -08:00
2015-10-04 12:54:54 +01:00
2015-11-19 16:22:43 +01:00
2015-10-27 19:55:13 -07:00
2015-09-20 17:00:26 -07:00
2015-09-11 15:21:34 -07:00
2015-07-01 10:49:25 -07:00
2015-07-23 17:43:30 -07:00
2015-12-13 19:59:48 -08:00
2015-12-17 11:18:44 +01:00
2015-07-16 10:30:55 -07:00
2016-01-04 16:11:11 -05:00
2015-08-05 08:48:00 +05:30
2016-01-14 16:00:49 -08:00
2015-11-20 16:17:32 -08:00
2016-01-10 17:54:28 -05:00
2016-01-14 16:00:49 -08:00
2015-10-20 10:23:55 +02:00
2015-12-15 23:26:51 -05:00
2015-04-11 15:53:35 -04:00
2015-09-01 08:40:25 -07:00
2015-09-20 19:32:02 -07:00
2015-10-06 11:15:43 -07:00
2015-06-25 17:00:38 -07:00
2015-10-04 20:28:58 +01:00
2015-07-29 00:13:25 -07:00
2016-01-06 11:02:29 +01:00
2015-09-10 13:29:01 -07:00
2016-01-04 10:20:19 -05:00
2015-10-26 10:11:58 +09:00
2015-10-14 02:17:33 +02:00
2015-09-08 15:35:28 -07:00
2015-09-08 15:35:28 -07:00
2015-12-01 14:00:53 -05:00
2015-07-01 10:36:39 -05:00
2015-11-13 21:53:18 -08:00
2015-06-25 17:00:39 -07:00
2015-10-21 14:42:38 -06:00
2015-11-05 14:36:09 -05:00
2015-11-23 15:34:34 -08:00
2016-01-14 16:00:49 -08:00
2015-09-20 22:52:13 -07:00
2015-09-02 10:33:22 +02:00
2015-08-17 11:25:28 -07:00
2015-12-10 22:41:06 -08:00
2015-06-12 11:15:49 +02:00
2015-10-01 09:59:01 -07:00
2015-06-19 15:18:28 +02:00
2015-10-01 09:57:59 -07:00
2015-10-19 01:01:21 +02:00
2013-03-15 00:36:09 -04:00
2015-10-25 21:33:56 -04:00
2015-11-05 19:34:48 -08:00
2015-12-06 12:56:06 +01:00
2016-01-12 20:04:15 -08:00
2015-08-03 15:24:43 -07:00
2015-12-13 19:59:48 -08:00
2015-11-25 15:49:13 +00:00
2015-06-15 16:02:52 -07:00
2015-11-05 19:34:48 -08:00
2015-12-18 17:48:50 -08:00
2015-12-06 20:42:15 -05:00
2015-11-23 09:44:58 +01:00
2015-12-01 14:58:18 -08:00
2015-09-04 16:54:41 -07:00
2015-08-12 17:01:01 +01:00
2015-12-04 08:38:42 -07:00
2015-11-05 11:07:36 +10:00
2015-12-04 10:38:59 -02:00
2015-11-05 19:34:48 -08:00
2015-11-01 17:09:15 -08:00
2015-10-17 22:03:00 -07:00
2015-12-29 17:45:49 -08:00
2015-02-02 10:09:54 -08:00
2015-12-04 10:34:45 +01:00
2016-01-12 18:57:02 -08:00
2015-11-03 20:46:26 +01:00
2015-12-08 11:29:47 -05:00
2015-12-13 19:46:12 -05:00
2015-09-08 15:35:28 -07:00
2015-11-06 17:50:42 -08:00
2015-11-06 17:50:42 -08:00
2015-11-06 17:50:42 -08:00
48131e03ca