NFSv4: Limit the total number of cached delegations

Delegations can be expensive to return, and can cause scalability issues
for the server. Let's therefore try to limit the number of inactive
delegations we hold.
Once the number of delegations is above a certain threshold, start
to return them on close.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index a777b3d0e7204903ffd431ce997976ea3bb3ec6e..4a841071d8a71dc3a04c89ee44606e6324787acd 100644 (file)
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -25,7 +25,10 @@
 #include "internal.h"
 #include "nfs4trace.h"
 
+#define NFS_DEFAULT_DELEGATION_WATERMARK (5000U)
+
 static atomic_long_t nfs_active_delegations;
+static unsigned nfs_delegation_watermark = NFS_DEFAULT_DELEGATION_WATERMARK;
 
 static void __nfs_free_delegation(struct nfs_delegation *delegation)
 {
@@ -676,7 +679,8 @@ void nfs4_inode_return_delegation_on_close(struct inode *inode)
        delegation = nfs4_get_valid_delegation(inode);
        if (!delegation)
                goto out;
-       if (test_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags)) {
+       if (test_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) ||
+           atomic_long_read(&nfs_active_delegations) >= nfs_delegation_watermark) {
                spin_lock(&delegation->lock);
                if (delegation->inode &&
                    list_empty(&NFS_I(inode)->open_files) &&
@@ -1365,3 +1369,5 @@ out:
        rcu_read_unlock();
        return ret;
 }
+
+module_param_named(delegation_watermark, nfs_delegation_watermark, uint, 0644);