On Fri 16-11-12 16:21:59, KAMEZAWA Hiroyuki wrote: > (2012/11/16 16:11), Glauber Costa wrote: > > On 11/16/2012 09:07 AM, Kamezawa Hiroyuki wrote: > >> (2012/11/15 22:47), Glauber Costa wrote: > >>> On 11/15/2012 01:41 PM, Kamezawa Hiroyuki wrote: > >>>> (2012/11/15 11:54), Glauber Costa wrote: > >>>>> The idea is to synchronously do it, leaving it up to the shrinking > >>>>> facilities in vmscan.c and/or others. Not actively retrying shrinking > >>>>> may leave the caches alive for more time, but it will remove the ugly > >>>>> wakeups. One would argue that if the caches have free objects but are > >>>>> not being shrunk, it is because we don't need that memory yet. > >>>>> > >>>>> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > >>>>> CC: Michal Hocko <mhocko@xxxxxxx> > >>>>> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > >>>>> CC: Johannes Weiner <hannes@xxxxxxxxxxx> > >>>>> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > >>>> > >>>> I agree this patch but can we have a way to see the number of unaccounted > >>>> zombie cache usage for debugging ? > >>>> > >>>> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > >>>> > >>> Any particular interface in mind ? > >>> > >> > >> Hmm, it's debug interface and having cgroup file may be bad..... > >> If it can be seen in bytes or some, /proc/vmstat ? > >> > >> out_of_track_slabs xxxxxxx. hm ? > >> > > > > I particularly think that, being this a debug interface, it is also > > useful to have an indication of which caches are still in place. This is > > because the cache itself, is the best indication we have about the > > specific workload that may be keeping it in memory. > > > > I first thought debugfs could help us probing useful information out of > > it, but given all the abuse people inflicted in debugfs... maybe we > > could have a file in the root memcg with that information for all > > removed memcgs? If we do that, we can go further and list the memcgs > > that are pending due to memsw as well. memory.dangling_memcgs ? > > > > Hm, I'm ok with it... others ? What about memory.kmem.dangling_caches? -- Michal Hocko SUSE Labs -- 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>