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Message-ID: <152506269054.7246.3941740801391514623.stgit@noble> Date: Mon, 30 Apr 2018 14:31:30 +1000 From: NeilBrown <neilb@...e.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Trond Myklebust <trond.myklebust@...marydata.com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Anna Schumaker <anna.schumaker@...app.com> Cc: linux-nfs@...r.kernel.org, Lai Jiangshan <jiangshanlai@...il.com>, Josh Triplett <josh@...htriplett.org>, Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org Subject: [PATCH 1/4] NFS: slight optimization for walking list for delegations There are 3 places where we walk the list of delegations for an nfs_client. In each case there are two nested loops, one for nfs_servers and one for nfs_delegations. When we find an interesting delegation we try to get an active reference to the server. If that fails, it is pointless to continue to look at the other delegation for the server as we will never be able to get an active reference. So instead of continuing in the inner loop, break out and continue in the outer loop. --- fs/nfs/delegation.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c index 1819d0d0ba4b..af32365894c8 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -495,7 +495,7 @@ int nfs_client_return_marked_delegations(struct nfs_client *clp) if (!nfs_delegation_need_return(delegation)) continue; if (!nfs_sb_active(server->super)) - continue; + break; inode = nfs_delegation_grab_inode(delegation); if (inode == NULL) { rcu_read_unlock(); @@ -887,7 +887,7 @@ void nfs_delegation_reap_unclaimed(struct nfs_client *clp) &delegation->flags) == 0) continue; if (!nfs_sb_active(server->super)) - continue; + break; inode = nfs_delegation_grab_inode(delegation); if (inode == NULL) { rcu_read_unlock(); @@ -995,7 +995,7 @@ void nfs_reap_expired_delegations(struct nfs_client *clp) &delegation->flags) == 0) continue; if (!nfs_sb_active(server->super)) - continue; + break; inode = nfs_delegation_grab_inode(delegation); if (inode == NULL) { rcu_read_unlock();
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