Files
odroid-linux/include/linux
Andrei Vagin d1be35cb6f proc: add seq_put_decimal_ull_width to speed up /proc/pid/smaps
seq_put_decimal_ull_w(m, str, val, width) prints a decimal number with a
specified minimal field width.

It is equivalent of seq_printf(m, "%s%*d", str, width, val), but it
works much faster.

== test_smaps.py
  num = 0
  with open("/proc/1/smaps") as f:
          for x in xrange(10000):
                  data = f.read()
                  f.seek(0, 0)
==

== Before patch ==
  $ time python test_smaps.py
  real    0m4.593s
  user    0m0.398s
  sys     0m4.158s

== After patch ==
  $ time python test_smaps.py
  real    0m3.828s
  user    0m0.413s
  sys     0m3.408s

$ perf -g record python test_smaps.py
== Before patch ==
-   79.01%     3.36%  python   [kernel.kallsyms]    [k] show_smap.isra.33
   - 75.65% show_smap.isra.33
      + 48.85% seq_printf
      + 15.75% __walk_page_range
      + 9.70% show_map_vma.isra.23
        0.61% seq_puts

== After patch ==
-   75.51%     4.62%  python   [kernel.kallsyms]    [k] show_smap.isra.33
   - 70.88% show_smap.isra.33
      + 24.82% seq_put_decimal_ull_w
      + 19.78% __walk_page_range
      + 12.74% seq_printf
      + 11.08% show_map_vma.isra.23
      + 1.68% seq_puts

[akpm@linux-foundation.org: fix drivers/of/unittest.c build]
Link: http://lkml.kernel.org/r/20180212074931.7227-1-avagin@openvz.org
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-11 10:28:33 -07:00
..
2018-02-14 09:43:22 -08:00
2017-11-28 16:30:38 +01:00
2018-01-01 22:54:42 -08:00
2018-02-20 11:34:54 +00:00
2018-03-08 13:56:24 +05:30
2018-03-29 14:29:55 -04:00
2018-03-16 10:56:13 +01:00
2018-03-31 02:15:18 +02:00
2018-03-31 02:16:26 +02:00
2018-03-31 02:14:44 +02:00
2017-12-19 16:35:34 -08:00
2018-01-03 14:03:48 +01:00
2018-03-16 10:55:47 +01:00
2018-03-26 15:09:38 +02:00
2018-03-12 10:05:01 +01:00
2018-01-01 12:40:27 -07:00
2018-03-26 15:56:44 +02:00
2018-03-31 02:15:18 +02:00
2018-02-26 09:48:42 -07:00
2018-02-06 16:41:29 -05:00
2018-02-22 21:13:03 +01:00
2018-03-26 08:53:43 -06:00
2018-01-17 11:30:16 +00:00
2018-02-24 01:43:47 +01:00
2018-03-13 13:29:10 -07:00
2017-12-01 13:09:40 -08:00
2018-01-03 11:00:22 -05:00
2018-04-11 10:28:32 -07:00
2018-03-26 13:14:43 -04:00
2018-03-26 13:14:43 -04:00
2018-03-26 13:14:43 -04:00
2018-03-30 12:56:22 -04:00
2018-01-28 22:17:24 -05:00
2018-01-08 08:22:45 -06:00
2018-01-17 15:25:50 +01:00
2018-01-08 08:22:45 -06:00
2017-12-14 16:00:49 -08:00
2018-01-31 17:18:37 -08:00
2018-01-19 16:50:53 -08:00
2017-12-16 02:05:48 +01:00
2018-02-06 16:41:28 -05:00
2018-02-20 16:12:26 -08:00
2017-12-11 14:37:11 -07:00
2018-03-17 14:20:55 +01:00
2018-03-01 08:33:05 -07:00
2018-01-29 12:02:54 -05:00
2018-04-05 21:36:24 -07:00
2018-04-05 21:36:27 -07:00
2018-01-18 11:56:49 +01:00
2018-01-15 12:07:46 -08:00
2018-02-06 18:32:47 -08:00
2018-01-09 16:27:43 +01:00
2018-02-20 16:10:25 -08:00
2018-02-06 18:32:44 -08:00
2017-12-20 09:53:54 -07:00