On Wed, May 18, 2011 at 10:30 PM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > On Wed, 18 May 2011 22:15:53 -0400 > Andrew Lutomirski <luto@xxxxxxx> wrote: > >> On Wed, May 18, 2011 at 1:17 AM, Minchan Kim <minchan.kim@xxxxxxxxx> wrote: >> > On Wed, May 18, 2011 at 4:22 AM, Andrew Lutomirski <luto@xxxxxxx> wrote: > >> > Andrew, Could you test this patch with !pgdat_balanced patch? >> > I think we shouldn't see OOM message if we have lots of free swap space. >> > >> > == CUT_HERE == >> > diff --git a/mm/vmscan.c b/mm/vmscan.c >> > index f73b865..cc23f04 100644 >> > --- a/mm/vmscan.c >> > +++ b/mm/vmscan.c >> > @@ -1341,10 +1341,6 @@ static inline bool >> > should_reclaim_stall(unsigned long nr_taken, >> > if (current_is_kswapd()) >> > return false; >> > >> > - /* Only stall on lumpy reclaim */ >> > - if (sc->reclaim_mode & RECLAIM_MODE_SINGLE) >> > - return false; >> > - >> > /* If we have relaimed everything on the isolated list, no stall */ >> > if (nr_freed == nr_taken) >> > return false; >> > >> > >> > >> > Then, if you don't see any unnecessary OOM but still see the hangup, >> > could you apply this patch based on previous? >> >> With this patch, I started GNOME and Firefox, turned on swap, and ran >> test_mempressure.sh 1500 1400 1. Instant panic (or OOPS and hang or >> something -- didn't get the top part). Picture attached -- it looks >> like memcg might be involved. I'm running F15, so it might even be >> doing something. >> > > Hmm, what kernel version do you use ? > I think memcg is not guilty because RIP is shrink_page_list(). > But ok, I'll dig this. Could you give us your .config ? Attached. The address in shrink_page_list is ud2, from (I think) VM_BUG_ON(PageActive(page));. The sequence is: 0xffffffff810d24cc <+202>: callq 0xffffffff810cf930 <test_and_set_bit> 0xffffffff810d24d1 <+207>: test %eax,%eax 0xffffffff810d24d3 <+209>: jne 0xffffffff810d2aa5 <shrink_page_list+1699> 0xffffffff810d24d9 <+215>: mov -0x28(%rbx),%rax 0xffffffff810d24dd <+219>: test $0x40,%al 0xffffffff810d24df <+221>: je 0xffffffff810d24e3 <shrink_page_list+225> 0xffffffff810d24e1 <+223>: ud2 --Andy
Attachment:
.config
Description: Binary data