[PATCH 01/19] dcache: convert dentry_stat.nr_unused to per-cpu counters
From: Dave Chinner <david@fromorbit.com>
Date: 2012-11-27 23:14:28
Also in:
linux-fsdevel, linux-xfs, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
From: Dave Chinner <redacted> Before we split up the dcache_lru_lock, the unused dentry counter needs to be made independent of the global dcache_lru_lock. Convert it to per-cpu counters to do this. Signed-off-by: Dave Chinner <redacted> Reviewed-by: Christoph Hellwig <hch@lst.de> --- fs/dcache.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 3a463d0..2fc0daa 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c@@ -118,6 +118,7 @@ struct dentry_stat_t dentry_stat = { }; static DEFINE_PER_CPU(unsigned int, nr_dentry); +static DEFINE_PER_CPU(unsigned int, nr_dentry_unused); #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS) static int get_nr_dentry(void)
@@ -129,10 +130,20 @@ static int get_nr_dentry(void) return sum < 0 ? 0 : sum; } +static int get_nr_dentry_unused(void) +{ + int i; + int sum = 0; + for_each_possible_cpu(i) + sum += per_cpu(nr_dentry_unused, i); + return sum < 0 ? 0 : sum; +} + int proc_nr_dentry(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { dentry_stat.nr_dentry = get_nr_dentry(); + dentry_stat.nr_unused = get_nr_dentry_unused(); return proc_dointvec(table, write, buffer, lenp, ppos); } #endif
@@ -312,7 +323,7 @@ static void dentry_lru_add(struct dentry *dentry) spin_lock(&dcache_lru_lock); list_add(&dentry->d_lru, &dentry->d_sb->s_dentry_lru); dentry->d_sb->s_nr_dentry_unused++; - dentry_stat.nr_unused++; + this_cpu_inc(nr_dentry_unused); spin_unlock(&dcache_lru_lock); } }
@@ -322,7 +333,7 @@ static void __dentry_lru_del(struct dentry *dentry) list_del_init(&dentry->d_lru); dentry->d_flags &= ~DCACHE_SHRINK_LIST; dentry->d_sb->s_nr_dentry_unused--; - dentry_stat.nr_unused--; + this_cpu_dec(nr_dentry_unused); } /*
@@ -360,7 +371,7 @@ static void dentry_lru_move_list(struct dentry *dentry, struct list_head *list) if (list_empty(&dentry->d_lru)) { list_add_tail(&dentry->d_lru, list); dentry->d_sb->s_nr_dentry_unused++; - dentry_stat.nr_unused++; + this_cpu_inc(nr_dentry_unused); } else { list_move_tail(&dentry->d_lru, list); }
--
1.7.10
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