(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 ? Thanks, -Kame -- 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>