Files
ubports_kernel_google_msm/include/linux
Keika Kobayashi 873b477177 per-task-delay-accounting: add memory reclaim delay
Sometimes, application responses become bad under heavy memory load.
Applications take a bit time to reclaim memory.  The statistics, how long
memory reclaim takes, will be useful to measure memory usage.

This patch adds accounting memory reclaim to per-task-delay-accounting for
accounting the time of do_try_to_free_pages().

<i.e>

- When System is under low memory load,
  memory reclaim may not occur.

$ free
             total       used       free     shared    buffers     cached
Mem:       8197800    1577300    6620500          0       4808    1516724
-/+ buffers/cache:      55768    8142032
Swap:     16386292          0   16386292

$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0      0 5069748  10612 3014060    0    0     0     0    3   26  0  0 100  0
 0  0      0 5069748  10612 3014060    0    0     0     0    4   22  0  0 100  0
 0  0      0 5069748  10612 3014060    0    0     0     0    3   18  0  0 100  0

Measure the time of tar command.

$ ls -s test.dat
1501472 test.dat

$ time tar cvf test.tar test.dat
real    0m13.388s
user    0m0.116s
sys     0m5.304s

$ ./delayget -d -p <pid>
CPU             count     real total  virtual total    delay total
                  428     5528345500     5477116080       62749891
IO              count    delay total
                  338     8078977189
SWAP            count    delay total
                    0              0
RECLAIM         count    delay total
                    0              0

- When system is under heavy memory load
  memory reclaim may occur.

$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0 7159032  49724   1812   3012    0    0     0     0    3   24  0  0 100  0
 0  0 7159032  49724   1812   3012    0    0     0     0    4   24  0  0 100  0
 0  0 7159032  49848   1812   3012    0    0     0     0    3   22  0  0 100  0

In this case, one process uses more 8G memory
by execution of malloc() and memset().

$ time tar cvf test.tar test.dat
real    1m38.563s        <-  increased by 85 sec
user    0m0.140s
sys     0m7.060s

$ ./delayget -d -p <pid>
CPU             count     real total  virtual total    delay total
                 9021     7140446250     7315277975      923201824
IO              count    delay total
                 8965    90466349669
SWAP            count    delay total
                    3       21036367
RECLAIM         count    delay total
                  740    61011951153

In the later case, the value of RECLAIM is increasing.
So, taskstats can show how much memory reclaim influences TAT.

Signed-off-by: Keika Kobayashi <kobayashi.kk@ncos.nec.co.jp>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujistu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25 10:53:47 -07:00
..
2008-07-25 10:53:30 -07:00
2008-07-21 21:55:03 -07:00
2008-07-14 14:52:56 -04:00
2008-07-01 11:28:06 +10:00
2008-06-19 10:42:17 +10:00
2008-06-19 10:42:17 +10:00
2008-04-29 08:06:00 -07:00
2008-07-24 10:47:24 -07:00
2008-07-24 10:47:33 -07:00
2008-07-24 10:47:33 -07:00
2008-07-03 13:21:14 +02:00
2008-04-29 08:11:16 -07:00
2008-06-06 11:29:10 -07:00
2008-05-29 01:38:46 -07:00
2008-04-22 15:16:32 -05:00
2008-04-29 08:06:01 -07:00
2008-07-04 10:40:05 -07:00
2008-07-25 10:53:33 -07:00
2008-05-01 08:03:59 -07:00
2008-07-20 17:12:38 -07:00
2008-07-22 17:30:57 -07:00
2008-07-11 10:46:50 +02:00
2008-07-21 12:00:37 +01:00
2008-04-21 11:22:28 -05:00
2008-04-25 13:26:55 +01:00
2008-04-25 13:26:55 +01:00
2008-07-21 12:00:37 +01:00
2008-04-25 13:26:55 +01:00
2008-04-28 08:58:30 -07:00
2008-07-24 10:47:29 -07:00
2008-05-07 09:48:23 +02:00
2008-07-24 10:47:41 -07:00
2008-05-16 17:22:26 -04:00
2008-05-01 13:08:16 -04:00
2008-07-08 17:55:41 +02:00
2008-07-16 23:27:03 +02:00
2008-07-24 10:47:29 -07:00
2008-07-11 15:49:21 +02:00
2008-05-13 08:02:26 -07:00
2008-07-20 17:12:36 -07:00
2008-07-25 10:53:30 -07:00
2008-07-20 17:12:36 -07:00
2008-07-23 15:25:21 +02:00
2008-05-20 16:44:43 +02:00
2008-04-22 11:34:59 +02:00
2008-07-25 10:53:42 -07:00
2008-06-11 21:00:38 -07:00
2008-07-18 18:05:19 -07:00
2008-06-11 21:00:38 -07:00
2008-07-14 22:49:06 -07:00
2008-07-03 17:51:57 +09:00
2008-07-25 10:53:39 -07:00
2008-07-25 10:53:28 -07:00
2008-05-05 16:47:14 +10:00
2008-07-16 23:27:07 +02:00
2008-06-11 21:00:38 -07:00
2008-04-29 08:06:15 -07:00
2008-04-19 19:10:28 -07:00
2008-07-20 17:12:37 -07:00
2008-05-01 08:03:58 -07:00
2008-05-20 12:17:39 -04:00
2008-07-25 10:53:29 -07:00
2008-07-25 10:53:34 -07:00
2008-07-25 10:53:29 -07:00
2008-07-24 10:47:17 -07:00
2008-07-04 10:40:05 -07:00
2008-04-19 19:44:57 +02:00
2008-07-20 12:42:32 +03:00
2008-07-23 09:49:56 +01:00
2008-07-24 10:47:41 -07:00
2008-05-23 22:26:03 +02:00
2008-04-29 08:06:01 -07:00
2008-07-25 10:53:40 -07:00
2008-07-24 10:47:24 -07:00
2008-07-25 10:53:34 -07:00
2008-06-06 11:29:12 -07:00
2008-04-28 08:58:29 -07:00
2008-07-25 10:53:29 -07:00
2008-04-19 16:54:56 -04:00
2008-07-24 10:47:15 -07:00
2008-07-24 11:50:15 -07:00
2008-06-10 14:37:03 -07:00
2008-07-07 16:26:50 -07:00
2008-04-20 21:47:03 -07:00
2008-04-29 08:06:02 -07:00
2008-04-29 08:06:02 -07:00
2008-05-06 12:01:41 -04:00
2008-06-11 21:00:38 -07:00
2008-06-11 21:00:38 -07:00
2008-07-25 10:53:44 -07:00
2008-05-19 16:25:39 +01:00
2008-07-25 10:53:29 -07:00
2008-05-19 10:01:36 +02:00
2008-07-04 10:40:07 -07:00
2008-07-25 10:53:29 -07:00
2008-04-29 08:05:59 -07:00
2008-05-25 07:09:47 +02:00
2008-07-24 10:47:33 -07:00
2008-07-24 10:47:22 -07:00
2008-07-25 10:53:42 -07:00
2008-07-24 08:31:21 -04:00
2008-04-25 00:25:08 +02:00
2008-04-28 08:58:32 -07:00
2008-07-24 10:47:24 -07:00
2008-07-14 22:49:06 -07:00
2008-07-24 10:47:21 -07:00
2008-07-04 10:40:04 -07:00
2008-07-25 10:53:30 -07:00
2008-06-20 14:05:53 -06:00
2008-07-04 11:26:40 +02:00
2008-07-20 17:12:37 -07:00
2008-06-12 14:25:09 -07:00
2008-04-28 08:58:20 -07:00
2008-06-12 10:48:00 +02:00
2008-05-01 08:03:59 -07:00
2008-07-22 13:03:28 -07:00
2008-07-20 17:12:34 -07:00
2008-07-22 13:03:27 -07:00
2008-07-21 15:15:55 -07:00
2008-05-09 07:45:18 -07:00
2008-04-28 08:58:21 -07:00
2008-07-24 10:47:14 -07:00
2008-07-25 10:53:40 -07:00