David Rientjes <rient...@google.com> wrote: > > On Tue, 2013-05-21 at 14:28 +0200, Florian Westphal wrote: > > > seems like sk_page_frag_refill() can cause oom-killer invocation: > > > > > > postgres invoked oom-killer: gfp_mask=0x42d0, order=3, oom_score_adj=0 > > > Pid: 10551, comm: postgres Tainted: G O 3.8.6-5.g613ca40-smp #1 > > > Call Trace: > > > [<c106dbd5>] ? dump_header+0x60/0x191 > > > [<c1133d3a>] ? ___ratelimit+0xb2/0xc4 > > > [<c106dfd3>] ? oom_kill_process+0x61/0x2d1 > > > [<c1030042>] ? has_capability_noaudit+0x1c/0x23 > > > [<c106df0f>] ? oom_badness+0x8c/0xef > > > [<c106e446>] ? out_of_memory+0x203/0x247 > > > [<c107128a>] ? __alloc_pages_nodemask+0x42b/0x4c3 > > > [<c11fa66a>] ? sk_page_frag_refill+0x6a/0xd2 > > > [<c1233548>] ? tcp_sendmsg+0x3e8/0x7c6 > > > [<c124f34b>] ? inet_sendmsg+0x6b/0x75 > > > [<c11f74d8>] ? sock_sendmsg+0x8d/0xa6 > > > [<c11f7b83>] ? sys_sendto+0x105/0x130 > > > [<c1025927>] ? __kunmap_atomic+0x62/0x8a > > > [<c1025940>] ? __kunmap_atomic+0x7b/0x8a > > > [<c1073d78>] ? __lru_cache_add+0x18/0x47 > > > [<c10812f9>] ? handle_pte_fault+0x745/0x751 > > > [<c1025a2d>] ? kmap_atomic_prot+0xd3/0xf1 > > > [<c10817da>] ? handle_mm_fault+0x112/0x121 > > > [<c11f7be5>] ? sys_send+0x37/0x3b > > > > > > The system is busy, so, order-3 alloc failure doesn't strike me as odd. > > > > > > There are no allocation failures with order != 3. > > > > > > Sometimes this can happen in very short sucession, i.e. > > > and oom-killer did end up zapping 30 processes or so. > > Aside from the __GFP_NORETRY issue, could you post the full oom killer log > where it kills more than one process with /proc/sys/vm/oom_dump_tasks > enabled? That shouldn't happen unless you have a memory leak.
http://strlen.de/fw/oom.txt HOWEVER, before you spend time on this: I don't think there is an issue with oom killer, I only noticed that after kernel update oom killer invocations are a) more frequent than before b) often show above backtrace (sk_page_frag_refill). I'm not even saying "sk_page_frag_refill is broken", since I don't know if adding GFP_NORETRY might add silent performance degradation, etc. Its very well possible that everything is working as intended :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
