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quota: Make quota stat accounting lockless.

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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>
This commit is contained in:
Dmitry Monakhov
2010-04-26 20:03:33 +04:00
committed by Jan Kara
parent da8d1ba22f
commit dde9588853
4 changed files with 107 additions and 47 deletions
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4
fs/quota/quota_tree.c
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@@ -384,7 +384,7 @@ int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
} else {
ret = 0;
}
dqstats.writes++;
dqstats_inc(DQST_WRITES);
kfree(ddquot);
return ret;
@@ -634,7 +634,7 @@ int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
spin_unlock(&dq_data_lock);
kfree(ddquot);
out:
dqstats.reads++;
dqstats_inc(DQST_READS);
return ret;
}
EXPORT_SYMBOL(qtree_read_dquot);