Messages in this thread | | | Date | Fri, 22 Jan 2010 08:54:20 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH] oom-kill: add lowmem usage aware oom kill handling |
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On Thu, 21 Jan 2010 20:59:48 +0530 Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> On Thursday 21 January 2010 11:29 AM, KAMEZAWA Hiroyuki wrote: > > A patch for avoiding oom-serial-killer at lowmem shortage. > > Patch is onto mmotm-2010/01/15 (depends on mm-count-lowmem-rss.patch) > > Tested on x86-64/SMP + debug module(to allocated lowmem), works well. > > > > == > > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > > > One cause of OOM-Killer is memory shortage in lower zones. > > (If memory is enough, lowmem_reserve_ratio works well. but..) > > > > In lowmem-shortage oom-kill, oom-killer choses a vicitim process > > on their vm size. But this kills a process which has lowmem memory > > only if it's lucky. At last, there will be an oom-serial-killer. > > > > Now, we have per-mm lowmem usage counter. We can make use of it > > to select a good? victim. > > Have you seen any use cases that need this change? Or is it mostly via > code review and to utilize the availability of lowmem rss? Do we often > run into lowmem shortage triggering OOM? > - I saw lowmem OOM killer very frequently on x86-32 box in my cusotmers. - I saw lowmem OOM killer somemtimes on ia64 box in my customers.
I know this helps oom handling in x86-32+Highmem environments.
For my _new_ customers, almost all devices are connected to 64bit PCI bus. So, this is not for my customers ;) But OOM-Killer should handle this case.
Thanks, -Kame
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