On Thu, 25 Jan 2007 16:32:28 +0100 Peter Zijlstra <[EMAIL PROTECTED]> wrote:
> Hopefully the last version ;-) > > > --- > Subject: nfs: fix congestion control > > The current NFS client congestion logic is severly broken, it marks the > backing > device congested during each nfs_writepages() call but doesn't mirror this in > nfs_writepage() which makes for deadlocks. Also it implements its own > waitqueue. > > Replace this by a more regular congestion implementation that puts a cap on > the > number of active writeback pages and uses the bdi congestion waitqueue. > > Also always use an interruptible wait since it makes sense to be able to > SIGKILL the process even for mounts without 'intr'. > > .. > > --- linux-2.6-git.orig/include/linux/nfs_fs_sb.h 2007-01-25 > 16:07:03.000000000 +0100 > +++ linux-2.6-git/include/linux/nfs_fs_sb.h 2007-01-25 16:07:12.000000000 > +0100 > @@ -82,6 +82,7 @@ struct nfs_server { > struct rpc_clnt * client_acl; /* ACL RPC client handle */ > struct nfs_iostats * io_stats; /* I/O statistics */ > struct backing_dev_info backing_dev_info; > + atomic_t writeback; /* number of writeback pages */ We're going to get in trouble with this sort of thing within a few years. atomic_t is 32-bit. Put 16TB of memory under writeback and blam. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/