On 06/28/2011 06:12 PM, Daisuke Nishimura wrote: > On Tue, 28 Jun 2011 17:42:11 -0700 > Kevin Constantine<kevin.constant...@disneyanimation.com> wrote: > >> On 06/28/2011 05:32 PM, Daisuke Nishimura wrote: >>> Hi. >>> >>> On Tue, 28 Jun 2011 11:26:14 -0700 >>> Kevin Constantine<kevin.constant...@disneyanimation.com> wrote: >>> >>>> Hey everyone- >>>> >>>> I'm not sure what to make of the memory.usage_in_bytes value. There's a >>>> cgroup that has no processes in it, but the memory.usage_in_bytes is set >>>> to 4GB. >>>> >>>> [root@tera1132 coda]# cat cgroup.procs >>>> [root@tera1132 coda]# cat tasks >>>> [root@tera1132 coda]# cat memory.usage_in_bytes >>>> 4670476288 >>>> [root@tera1132 coda]# >>>> >>>> Is this a bug, or am I mis-understanding the purpose of that attribute? >>>> >>> What does "cat memory.use_hierarchy" show ? >>> If it shows "1"(iow, enabled), the usages of all cgroups under the directory >>> are summed up and accounted as usage of the directory. >>> >>> Thanks, >>> Daisuke Nishimura. >> >> memory.use_heirarchy is 0. There aren't any cgroups below this one anyway. >> >> [root@tera1138 coda]# cat cgroup.procs >> [root@tera1138 coda]# cat tasks >> [root@tera1138 coda]# cat memory.use_hierarchy >> 0 >> [root@tera1138 coda]# cat memory.usage_in_bytes >> 3161718784 >> [root@tera1138 coda]# >> >> -kevin > hmm, I see. > > Another possibility is that these usages are used by processes which were > running > in the group before(and not in the group anymore, or have exited). > > You can use memory.move_charge_at_immigrate to move usage along with task > move. > But note that it can only move usage of mmaped memory by the process(See > Documentation/cgroups/memory.txt for details), and older kernel doesn't have > the feature. > > And, page-cache is not freed usually even if a process has exited. If you want > to flush it, you need "echo 1>/proc/sys/vm/drop_caches". > > Thanks, > Daisuke Nishimura.
It looks like it's the pagecache that was throwing me off. "cache" from memory.stat is equivalent to the memory.usage_in_bytes value, and rss is 0. [root@tera1133 coda]# cat cgroup.procs [root@tera1133 coda]# cat memory.usage_in_bytes 2658271232 [root@tera1133 coda]# cat memory.use_hierarchy 0 [root@tera1133 coda]# cat memory.stat cache 2658271232 rss 0 mapped_file 28672 pgpgin 376859956 pgpgout 376210964 swap 0 inactive_anon 0 active_anon 0 inactive_file 1245843456 active_file 1412427776 unevictable 0 hierarchical_memory_limit 6442450944 hierarchical_memsw_limit 9223372036854775807 total_cache 2658271232 total_rss 0 total_mapped_file 28672 total_pgpgin 376859956 total_pgpgout 376210964 total_swap 0 total_inactive_anon 0 total_active_anon 0 total_inactive_file 1245843456 total_active_file 1412427776 total_unevictable 0 I'll start using the values in memory.stat instead. Thanks everyone. ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ Libcg-devel mailing list Libcg-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libcg-devel
