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authorDmitry Monakhov <dmonakhov@openvz.org>2010-04-26 20:03:33 +0400
committerJan Kara <jack@suse.cz>2010-05-21 19:30:41 +0200
commitdde9588853b1bde542eab247f8838c472806688f (patch)
tree9f9c68bf63120056517bbfce78b75e6820cc4c4b /include/linux/quota.h
parentda8d1ba22fa1fd0c0e541a43d75ebb062589b14b (diff)
quota: Make quota stat accounting lockless.
Quota stats is mostly writable data structure. Let's alloc percpu bucket for each value. NOTE: dqstats_read() function is racy against dqstats_{inc,dec} and may return inconsistent value. But this is ok since absolute accuracy is not required. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'include/linux/quota.h')
-rw-r--r--include/linux/quota.h42
1 files changed, 34 insertions, 8 deletions
diff --git a/include/linux/quota.h b/include/linux/quota.h
index b462916b2a0a..cdfde10481b7 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -174,6 +174,8 @@ enum {
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
@@ -238,19 +240,43 @@ static inline int info_dirty(struct mem_dqinfo *info)
return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
}
+enum {
+ DQST_LOOKUPS,
+ DQST_DROPS,
+ DQST_READS,
+ DQST_WRITES,
+ DQST_CACHE_HITS,
+ DQST_ALLOC_DQUOTS,
+ DQST_FREE_DQUOTS,
+ DQST_SYNCS,
+ _DQST_DQSTAT_LAST
+};
+
struct dqstats {
- int lookups;
- int drops;
- int reads;
- int writes;
- int cache_hits;
- int allocated_dquots;
- int free_dquots;
- int syncs;
+ int stat[_DQST_DQSTAT_LAST];
};
+extern struct dqstats *dqstats_pcpu;
extern struct dqstats dqstats;
+static inline void dqstats_inc(unsigned int type)
+{
+#ifdef CONFIG_SMP
+ per_cpu_ptr(dqstats_pcpu, smp_processor_id())->stat[type]++;
+#else
+ dqstats.stat[type]++;
+#endif
+}
+
+static inline void dqstats_dec(unsigned int type)
+{
+#ifdef CONFIG_SMP
+ per_cpu_ptr(dqstats_pcpu, smp_processor_id())->stat[type]--;
+#else
+ dqstats.stat[type]--;
+#endif
+}
+
#define DQ_MOD_B 0 /* dquot modified since read */
#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */