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

[Joseph Qi]

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 Aug 24, 2014 10:42 PM, "Joseph Qi" <joseph.qi at huawei.com <mailto:joseph.qi at huawei.com>> 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 possible if mounts multiple volumes on each node.
> 
>     > On Aug 24, 2014 7:06 PM, "Xue jiufei" <xuejiufei at huawei.com <mailto:xuejiufei at huawei.com> <mailto:xuejiufei at huawei.com <mailto:xuejiufei at huawei.com>>> wrote:
>     >
>     >     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_query_region_handler() should also use GFP_NOFS instead of GFP_KERNEL,
>     >     right?
>     >
>     >     Thanks.
>     >     Xuejiufei
>     >     >
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