Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 08/29/2014 03:22 PM, Xue jiufei wrote: > On 2014/8/29 11:26, Junxiao Bi wrote: >> On 08/28/2014 04:16 PM, Xue jiufei wrote: >>> Hi Junxiao, >>> On 2014/8/25 9:50, Junxiao Bi wrote: Hi Jiufei, Maybe you can consider using PF_FSTRANS flag, set this flag before allocating memory

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 2014/8/29 11:26, Junxiao Bi wrote: > On 08/28/2014 04:16 PM, Xue jiufei wrote: >> Hi Junxiao, >> On 2014/8/25 9:50, Junxiao Bi wrote: >>> Hi Jiufei, >>> >>> Maybe you can consider using PF_FSTRANS flag, set this flag before >>> allocating memory with GFP_KERNEL flag and unset after the allocatio

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 08/28/2014 04:16 PM, Xue jiufei wrote: > Hi Junxiao, > On 2014/8/25 9:50, Junxiao Bi wrote: >> Hi Jiufei, >> >> Maybe you can consider using PF_FSTRANS flag, set this flag before >> allocating memory with GFP_KERNEL flag and unset after the allocation. >> Checking this flag in ocfs2 when trying

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi Junxiao, On 2014/8/25 9:50, Junxiao Bi wrote: > Hi Jiufei, > > Maybe you can consider using PF_FSTRANS flag, set this flag before > allocating memory with GFP_KERNEL flag and unset after the allocation. > Checking this flag in ocfs2 when trying to free some pages during memory > direct reclaim.

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi, What is o2net_wq waiting on that is preventing it from processing the reply for unlock? Sorry for being a bit slow. Do you have the raw stacks of the deadlock? I mean, making that alloc NOFS should not be an issue. But I would like to understand whether we are fixing the actual problem or not

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi, Sunil On 2014/8/26 1:13, Sunil Mushran wrote: > On Sun, Aug 24, 2014 at 11:05 PM, Joseph Qi > wrote: > > On 2014/8/25 13:45, Sunil Mushran wrote: > > Please could you expand on that. > > > In our scenario, one node can mount multiple volumes across

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On Sun, Aug 24, 2014 at 11:05 PM, Joseph Qi wrote: > On 2014/8/25 13:45, Sunil Mushran wrote: > > Please could you expand on that. > > > In our scenario, one node can mount multiple volumes across the > cluster. > For instance, N1 has mounted ocfs2 volumes say volume1, volume2, > volume3. And vol

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 2014/8/25 13:45, Sunil Mushran wrote: > Please could you expand on that. > In our scenario, one node can mount multiple volumes across the cluster. For instance, N1 has mounted ocfs2 volumes say volume1, volume2, volume3. And volume3 may do umount/mount during runtime of other volumes. > On Au

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Please could you expand on that. On Aug 24, 2014 10:42 PM, "Joseph Qi" wrote: > On 2014/8/25 13:00, Sunil Mushran wrote: > > Functions in dlmdomain.c are only triggered during mount. So they cannot > trigger the deadlock as described above in this thread. I would leave them > as is. > > > It is p

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 2014/8/25 13:00, Sunil Mushran wrote: > Functions in dlmdomain.c are only triggered during mount. So they cannot > trigger the deadlock as described above in this thread. I would leave them as > is. > It is possible if mounts multiple volumes on each node. > On Aug 24, 2014 7:06 PM, "Xue jiu

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Functions in dlmdomain.c are only triggered during mount. So they cannot trigger the deadlock as described above in this thread. I would leave them as is. On Aug 24, 2014 7:06 PM, "Xue jiufei" wrote: > Hi Sunil, > On 2014/8/23 1:08, Sunil Mushran wrote: > > Allocs made via GFP_NOFS, by definition

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi Sunil, On 2014/8/23 1:08, Sunil Mushran wrote: > Allocs made via GFP_NOFS, by definition, should not trigger any reclaim from > the fs. > So this situation should never arise. That's why all allocs in the dlm have > NOFS. > Thanks for your reply. I haven't noticed that before. So I think dlm_q

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi Jiufei, Maybe you can consider using PF_FSTRANS flag, set this flag before allocating memory with GFP_KERNEL flag and unset after the allocation. Checking this flag in ocfs2 when trying to free some pages during memory direct reclaim. See an example from upstream commit 5cf02d09b50b1ee1c2d536c9

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

Allocs made via GFP_NOFS, by definition, should not trigger any reclaim from the fs. So this situation should never arise. That's why all allocs in the dlm have NOFS. ___ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/l

Re: [Ocfs2-devel] A deadlock when system do not has sufficient memory

On 2014/8/20 11:57, Xue jiufei wrote: > Hi all, > We found there may exist a deadlock when system has not sufficient > memory. Here's the situation: > N1 N2 > send message to N1 > o2net_wq(kworker) >

[Ocfs2-devel] A deadlock when system do not has sufficient memory

Hi all, We found there may exist a deadlock when system has not sufficient memory. Here's the situation: N1 N2 send message to N1 o2net_wq(kworker) receiving message and call corresponding handler to