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SubjectRe: [PATCH] memcg: update documentation v3
On Fri, 9 Apr 2010 10:45:56 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> On Fri, 9 Apr 2010 10:26:26 +0900
> Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
> > > +Current Status: linux-2.6.34-mmotm(development version of 2010/April)
> > > +
> > > +Features:
> > > + - accounting anonymous pages, file caches, swap caches usage and limit them.
> > > + - private LRU and reclaim routine. (system's global LRU and private LRU
> > > + work independently from each other)
> > > + - optionally, memory+swap usage can be accounted and limited.
> > > + - hierarchical accounting
> > > + - soft limit
> > > + - moving(recharging) account at moving a task is selectable.
> > > + - usage threshold notifier
> > > + - oom-killer disable knob and oom-notifier
> > > + - Root cgroup has no limit controls.
> > > +
> > > + Kernel memory and Hugepages are not under control yet. We just manage
> > > + pages on LRU. To add more controls, we have to take care of performance.
> > > +
> > > +Brief summary of control files.
> > > +
> > > + tasks # attach a task(thread)
> > > + cgroup.procs # attach a process(all threads under it)
> > IIUC, writing to cgroup.procs isn't supported yet. So, I think we don't have to
> > bother explaining cgroup.procs here.
> >
>
> It's supported. See Documetaion/cgroup/cgroup.txt
> IIRC, I use cgroup.procs file for migrating, sometimes.
>
I can't write to it now.

# echo $$ >/cgroup/memory/01/cgroup.procs
-bash: echo: write error: Invalid argument
# ls -l /cgroup/memory/01/cgroup.procs
-r--r--r-- 1 root root 0 2010-04-09 10:41 /cgroup/memory/01/cgroup.procs
# uname -a
Linux GibsonE 2.6.34-rc3-mm1-00432-g37c11f5 #1 SMP Thu Apr 8 11:03:39 JST 2010 x86_64 x86_64 x86_64 GNU/Linux

And kernel/cgroup.c says:

3161 {
3162 .name = CGROUP_FILE_GENERIC_PREFIX "procs",
3163 .open = cgroup_procs_open,
3164 /* .write_u64 = cgroup_procs_write, TODO */
3165 .release = cgroup_pidlist_release,
3166 .mode = S_IRUGO,
3167 },
IIRC, it's supported once, but the patch was dropped.


Thanks,
Daisuke Nishimura.


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