> Hi Ram,
>
> I was seeing it on NFS until I put in the following kswapd-specific hack
> into nfs_release_page():
>
> /* Only do I/O if gfp is a superset of GFP_KERNEL */
> if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
> int how = FLUSH_SYNC;
>
> /* Don't let kswapd deadlock waiting for OOM RPC calls */
> if (current_is_kswapd())
> how = 0;
So the patch can remove the above workaround together, and add comment
that NFS exploits the gfp mask to avoid complex operations involving
recursive memory allocation and hence deadlock?
Thanks,
Fengguang
> nfs_commit_inode(mapping->host, how);
> }
>
> Remove the 'if (current_is_kswapd())' line, and run an mmap() write
> intensive workload, and it should hang pretty much every time.
>
> Cheers
> Trond
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