This patchset introduces eventfd-based API for notifications in cgroups and
implements memory notifications on top of it.
It uses statistics in memory controler to track memory usage.
Before changes:
Root cgroup
Performance counter stats for './multi-fault 2' (5 runs):
117596.249864 task-clock-msecs # 1.960 CPUs ( +- 0.043% )
80114 context-switches # 0.001 M/sec ( +- 0.234% )
80 CPU-migrations # 0.000 M/sec ( +- 24.934% )
39120862 page-faults # 0.333 M/sec ( +- 0.138% )
294682530295 cycles # 2505.884 M/sec ( +- 0.076% ) (scaled from 70.00%)
191303772329 instructions # 0.649 IPC ( +- 0.041% ) (scaled from 80.01%)
39400843259 branches # 335.052 M/sec ( +- 0.062% ) (scaled from 80.02%)
497810459 branch-misses # 1.263 % ( +- 1.584% ) (scaled from 80.02%)
3352408601 cache-references # 28.508 M/sec ( +- 0.251% ) (scaled from 19.98%)
128744 cache-misses # 0.001 M/sec ( +- 4.542% ) (scaled from 19.98%)
60.001025199 seconds time elapsed ( +- 0.000% )
Non-root cgroup
Performance counter stats for './multi-fault 2' (5 runs):
116907.543887 task-clock-msecs # 1.948 CPUs ( +- 0.087% )
70497 context-switches # 0.001 M/sec ( +- 0.204% )
94 CPU-migrations # 0.000 M/sec ( +- 11.854% )
33894593 page-faults # 0.290 M/sec ( +- 0.123% )
291912994149 cycles # 2496.956 M/sec ( +- 0.102% ) (scaled from 70.03%)
194998499007 instructions # 0.668 IPC ( +- 0.109% ) (scaled from 80.01%)
41752189092 branches # 357.139 M/sec ( +- 0.118% ) (scaled from 79.96%)
487437901 branch-misses # 1.167 % ( +- 0.378% ) (scaled from 79.95%)
3076284269 cache-references # 26.314 M/sec ( +- 0.471% ) (scaled from 20.04%)
170468 cache-misses # 0.001 M/sec ( +- 1.481% ) (scaled from 20.05%)
60.001211398 seconds time elapsed ( +- 0.000% )
After changes:
Root cgroup
Performance counter stats for './multi-fault 2' (5 runs):
117396.738764 task-clock-msecs # 1.957 CPUs ( +- 0.047% )
78763 context-switches # 0.001 M/sec ( +- 0.132% )
109 CPU-migrations # 0.000 M/sec ( +- 25.646% )
38141062 page-faults # 0.325 M/sec ( +- 0.107% )
294257674123 cycles # 2506.523 M/sec ( +- 0.045% ) (scaled from 70.01%)
194937378540 instructions # 0.662 IPC ( +- 0.120% ) (scaled from 79.98%)
40694602714 branches # 346.642 M/sec ( +- 0.127% ) (scaled from 79.95%)
529968529 branch-misses # 1.302 % ( +- 1.668% ) (scaled from 79.94%)
3196763471 cache-references # 27.230 M/sec ( +- 0.262% ) (scaled from 20.05%)
201095 cache-misses # 0.002 M/sec ( +- 3.315% ) (scaled from 20.06%)
60.001025546 seconds time elapsed ( +- 0.000% )
Non-root cgroup:
Performance counter stats for './multi-fault 2' (5 runs):
116471.855099 task-clock-msecs # 1.941 CPUs ( +- 0.067% )
69393 context-switches # 0.001 M/sec ( +- 0.099% )
117 CPU-migrations # 0.000 M/sec ( +- 14.049% )
33043048 page-faults # 0.284 M/sec ( +- 0.086% )
290751403642 cycles # 2496.323 M/sec ( +- 0.073% ) (scaled from 69.97%)
196594115294 instructions # 0.676 IPC ( +- 0.065% ) (scaled from 79.97%)
42507307304 branches # 364.958 M/sec ( +- 0.054% ) (scaled from 79.96%)
500670691 branch-misses # 1.178 % ( +- 0.729% ) (scaled from 79.98%)
2935664654 cache-references # 25.205 M/sec ( +- 0.153% ) (scaled from 20.04%)
224967 cache-misses # 0.002 M/sec ( +- 2.462% ) (scaled from 20.02%)
60.001218531 seconds time elapsed ( +- 0.000% )
Any comments?
TODO:
- documentation.
v1 -> v2:
- use statistics instead of res_counter to track resource usage;
- fix bugs with locking;
v0 -> v1:
- memsw support implemented.
Kirill A. Shutemov (4):
cgroup: implement eventfd-based generic API for notifications
memcg: extract mem_group_usage() from mem_cgroup_read()
memcg: rework usage of stats by soft limit
memcg: implement memory thresholds
include/linux/cgroup.h | 20 +++
kernel/cgroup.c | 215 ++++++++++++++++++++++++++++++-
mm/memcontrol.c | 335 ++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 543 insertions(+), 27 deletions(-)
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