On Wed, Jul 16, 2014 at 03:31:29PM -0400, Naoya Horiguchi wrote: > On Wed, Jul 16, 2014 at 02:37:27PM -0400, Johannes Weiner wrote: > > On Wed, Jul 16, 2014 at 02:10:07PM -0400, Naoya Horiguchi wrote: > > > Hi, > > > > > > It seems that when a process in some memcg tries to allocate more than > > > memcg.limit_in_bytes, oom happens instead of swaping out in > > > mmotm-2014-07-09-17-08 (memcg.memsw.limit_in_bytes is large enough). > > > It does work in v3.16-rc3, so I think latest patches changed something. > > > I'm not familiar with memcg internally, so no idea about what caused it. > > > Could you see the problem? > > > > There are a lot of changes in memory and swap accounting, but I can > > not reproduce what you are describing: I set up a cgroup with a 100MB > > memory limit and an unlimited memory+swap, then start a task in there > > that faults 200MB worth of anonymous pages. The result is 100MB in > > memory, 100MB in swap: > > Hmm, this is almost the same test condition. > > > cache 0 > > rss 104267776 > > rss_huge 0 > > mapped_file 0 > > writeback 0 > > swap 105545728 > > pgpgin 26367 > > pgpgout 25950 > > pgfault 26695 > > pgmajfault 32 > > inactive_anon 52285440 > > active_anon 51982336 > > inactive_file 0 > > active_file 0 > > unevictable 0 > > hierarchical_memory_limit 104857600 > > hierarchical_memsw_limit 18446744073709551615 > > > > Filename Type Size Used Priority > > /swapfile file 8388604 109800 -1 > > > > Could you provide more detail on your configuration and test case? > > What I did is like this: > > [root@test_140715-0036 ~]# cat tmp_memcg_swap.sh > cgcreate -g memory:test1 > cgset -r memory.limit_in_bytes=0x1000000 test1 # 16 MB > cgset -r memory.memsw.limit_in_bytes=0x4000000 test1 # 64 MB > cgget -g memory:test1 > swapon -s > cgexec -g memory:test1 memhog -r1 20m # alloc 20 MB Okay, I tried with the smaller parameters that you use, but still couldn't reproduce it: cache 32768 rss 15867904 rss_huge 0 mapped_file 0 writeback 0 swap 5222400 pgpgin 1725 pgpgout 1420 pgfault 2015 pgmajfault 7 inactive_anon 10133504 active_anon 5726208 inactive_file 32768 active_file 0 unevictable 0 hierarchical_memory_limit 16777216 hierarchical_memsw_limit 67108864 16M in memory, 5M in swap, no OOM kills. > then output is like this: > > [root@test_140715-0036 ~]# bash tmp_memcg_swap.sh > test1: > memory.pressure_level: > memory.kmem.max_usage_in_bytes: 0 > memory.use_hierarchy: 1 > memory.swappiness: 60 > memory.memsw.failcnt: 0 > memory.limit_in_bytes: 16777216 > memory.memsw.max_usage_in_bytes: 0 > memory.usage_in_bytes: 0 > memory.memsw.limit_in_bytes: 67108864 > memory.failcnt: 0 > memory.kmem.limit_in_bytes: 18446744073709551615 > memory.force_empty: > memory.kmem.slabinfo: > memory.memsw.usage_in_bytes: 0 > memory.max_usage_in_bytes: 0 > memory.numa_stat: total=0 N0=0 N1=0 N2=0 N3=0 > file=0 N0=0 N1=0 N2=0 N3=0 > anon=0 N0=0 N1=0 N2=0 N3=0 > unevictable=0 N0=0 N1=0 N2=0 N3=0 > hierarchical_total=0 N0=0 N1=0 N2=0 N3=0 > hierarchical_file=0 N0=0 N1=0 N2=0 N3=0 > hierarchical_anon=0 N0=0 N1=0 N2=0 N3=0 > hierarchical_unevictable=0 N0=0 N1=0 N2=0 N3=0 > memory.kmem.tcp.limit_in_bytes: 18446744073709551615 > memory.oom_control: oom_kill_disable 0 > under_oom 0 > memory.kmem.tcp.max_usage_in_bytes: 0 > memory.kmem.failcnt: 0 > memory.kmem.usage_in_bytes: 0 > memory.stat: cache 0 > rss 0 > rss_huge 0 > mapped_file 0 > writeback 0 > swap 0 > pgpgin 0 > pgpgout 0 > pgfault 0 > pgmajfault 0 > inactive_anon 0 > active_anon 0 > inactive_file 0 > active_file 0 > unevictable 0 > hierarchical_memory_limit 16777216 > hierarchical_memsw_limit 67108864 > total_cache 0 > total_rss 0 > total_rss_huge 0 > total_mapped_file 0 > total_writeback 0 > total_swap 0 > total_pgpgin 0 > total_pgpgout 0 > total_pgfault 0 > total_pgmajfault 0 > total_inactive_anon 0 > total_active_anon 0 > total_inactive_file 0 > total_active_file 0 > total_unevictable 0 > recent_rotated_anon 0 > recent_rotated_file 0 > recent_scanned_anon 0 > recent_scanned_file 0 > memory.kmem.tcp.usage_in_bytes: 0 > memory.move_charge_at_immigrate: 0 > memory.soft_limit_in_bytes: 18446744073709551615 > memory.kmem.tcp.failcnt: 0 > > Filename Type Size Used Priority > /root/page_table_walker/swapfile file 40956 0 -1 > ..tmp_memcg_swap.sh: line 7: 1250 Killed cgexec -g memory:test1 memhog -r1 20m > > Kernel message is like this: > > [ 425.290261] memhog invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0 > [ 425.291356] memhog cpuset=/ mems_allowed=0-3 > [ 425.291992] CPU: 2 PID: 1234 Comm: memhog Not tainted 3.15.0-140716-1501-00003-gcb8370a1d76e #268 That's not mmotm-2014-07-09-17-08, though, is it? I was running on 3.16.0-rc5-mm1-00480-gab7ca1e1e407 (latest mmots). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>