The 'cred_unused' list, that is traversed by rpcauth_cache_shrinker is
ordered by time. If we hit a credential that is under the 60 second garbage
collection moratorium, we should exit because we know at that point that
all successive credentials are subject to the same moratorium...
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
net/sunrpc/auth.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 03ff9f9..2213dc5 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -236,10 +236,13 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) {
- /* Enforce a 60 second garbage collection moratorium */
+ /*
+ * Enforce a 60 second garbage collection moratorium
+ * Note that the cred_unused list must be time-ordered.
+ */
if (time_in_range(cred->cr_expire, expired, jiffies) &&
test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0)
- continue;
+ return 0;
list_del_init(&cred->cr_lru);
number_cred_unused--;
@@ -258,7 +261,7 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
if (nr_to_scan == 0)
break;
}
- return nr_to_scan;
+ return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
}
/*
@@ -275,8 +278,7 @@ rpcauth_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
if (list_empty(&cred_unused))
return 0;
spin_lock(&rpc_credcache_lock);
- nr_to_scan = rpcauth_prune_expired(&free, nr_to_scan);
- res = (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
+ res = rpcauth_prune_expired(&free, nr_to_scan);
spin_unlock(&rpc_credcache_lock);
rpcauth_destroy_credlist(&free);
return res;
--
1.6.6.1
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