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.
-
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