diff options
| author | Mike Snitzer <snitzer@kernel.org> | 2024-11-15 20:41:06 -0500 |
|---|---|---|
| committer | Anna Schumaker <anna.schumaker@oracle.com> | 2025-01-14 17:05:10 -0500 |
| commit | 4a489220aa8c9daf5f02396c28cebade9f9ab563 (patch) | |
| tree | c31e883fef1bebba297f7804d3d38c19c731fd8a /include/linux | |
| parent | 76d4cb6345da0f2cd505e552157258325bcc8bcd (diff) | |
nfs: probe for LOCALIO when v3 client reconnects to server
Re-enabling NFSv3 LOCALIO is made more complex (than NFSv4) because v3
is stateless. As such, the hueristic used to identify a LOCALIO probe
point is more adhoc by nature: if/when NFSv3 client IO begins to
complete again in terms of normal RPC-based NFSv3 server IO, attempt
nfs_local_probe_async().
Care is taken to throttle the frequency of nfs_local_probe_async(),
otherwise there could be a flood of repeat calls to
nfs_local_probe_async().
The throttle is admin controlled using a new module parameter for
nfsv3, e.g.:
echo 512 > /sys/module/nfsv3/parameters/nfs3_localio_probe_throttle
Probe for NFSv3 LOCALIO every N IO requests (512 in this case). Must
be power-of-2, defaults to 0 (probing disabled).
On systems that expect to use LOCALIO with NFSv3 the admin should
configure the 'nfs3_localio_probe_throttle' module parameter.
This commit backfills module parameter documentation in localio.rst
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nfslocalio.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h index 05817d6ef3d1..9aa8a43843d7 100644 --- a/include/linux/nfslocalio.h +++ b/include/linux/nfslocalio.h @@ -27,7 +27,8 @@ struct nfs_file_localio; */ typedef struct { uuid_t uuid; - /* sadly this struct is just over a cacheline, avoid bouncing */ + unsigned nfs3_localio_probe_count; + /* this struct is over a cacheline, avoid bouncing */ spinlock_t ____cacheline_aligned lock; struct list_head list; spinlock_t *list_lock; /* nn->local_clients_lock */ |