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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-19 21:22:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-19 21:22:53 -0700 |
| commit | 257313b2a87795e07a0bdf58d0fffbdba8b31051 (patch) | |
| tree | ff5043526b0381cdc1f1f68d3c6f8ed3635e0ddb /security | |
| parent | 044aea9b83614948c98564000db07d1d32b2d29b (diff) | |
| download | lwn-257313b2a87795e07a0bdf58d0fffbdba8b31051.tar.gz lwn-257313b2a87795e07a0bdf58d0fffbdba8b31051.zip | |
selinux: avoid unnecessary avc cache stat hit count
There is no point in counting hits - we can calculate it from the number
of lookups and misses.
This makes the avc statistics a bit smaller, and makes the code
generation better too.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/avc.c | 9 | ||||
| -rw-r--r-- | security/selinux/include/avc.h | 1 | ||||
| -rw-r--r-- | security/selinux/selinuxfs.c | 10 |
3 files changed, 11 insertions, 9 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c index 5971e30e8239..3d2715fd35ea 100644 --- a/security/selinux/avc.c +++ b/security/selinux/avc.c @@ -343,11 +343,10 @@ static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass) node = avc_search_node(ssid, tsid, tclass); if (node) - avc_cache_stats_incr(hits); - else - avc_cache_stats_incr(misses); + return node; - return node; + avc_cache_stats_incr(misses); + return NULL; } static int avc_latest_notif_update(int seqno, int is_insert) @@ -765,7 +764,7 @@ int avc_has_perm_noaudit(u32 ssid, u32 tsid, rcu_read_lock(); node = avc_lookup(ssid, tsid, tclass); - if (!node) { + if (unlikely(!node)) { rcu_read_unlock(); if (in_avd) diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h index e77b2ac2908b..47fda963495d 100644 --- a/security/selinux/include/avc.h +++ b/security/selinux/include/avc.h @@ -41,7 +41,6 @@ struct sk_buff; */ struct avc_cache_stats { unsigned int lookups; - unsigned int hits; unsigned int misses; unsigned int allocations; unsigned int reclaims; diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index ea39cb742ae5..c0e1a0f52462 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1380,10 +1380,14 @@ static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) if (v == SEQ_START_TOKEN) seq_printf(seq, "lookups hits misses allocations reclaims " "frees\n"); - else - seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, - st->hits, st->misses, st->allocations, + else { + unsigned int lookups = st->lookups; + unsigned int misses = st->misses; + unsigned int hits = lookups - misses; + seq_printf(seq, "%u %u %u %u %u %u\n", lookups, + hits, misses, st->allocations, st->reclaims, st->frees); + } return 0; } |