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authorDave Chinner <dchinner@redhat.com>2011-07-08 14:14:38 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 01:44:34 -0400
commitfcb94f72d3e0f4f34b326c2986da8e5996daf72c (patch)
treea18da3a56f447264c0dc2501a41afc5890afc78c /fs/inode.c
parente9299f5058595a655c3b207cda9635e28b9197e6 (diff)
inode: convert inode_stat.nr_unused to per-cpu counters
Before we split up the inode_lru_lock, the unused inode counter needs to be made independent of the global inode_lru_lock. Convert it to per-cpu counters to do this. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/inode.c b/fs/inode.c
index cbdcab88105..9a036112171 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -95,6 +95,7 @@ EXPORT_SYMBOL(empty_aops);
struct inodes_stat_t inodes_stat;
static DEFINE_PER_CPU(unsigned int, nr_inodes);
+static DEFINE_PER_CPU(unsigned int, nr_unused);
static struct kmem_cache *inode_cachep __read_mostly;
@@ -109,7 +110,11 @@ static int get_nr_inodes(void)
static inline int get_nr_inodes_unused(void)
{
- return inodes_stat.nr_unused;
+ int i;
+ int sum = 0;
+ for_each_possible_cpu(i)
+ sum += per_cpu(nr_unused, i);
+ return sum < 0 ? 0 : sum;
}
int get_nr_dirty_inodes(void)
@@ -127,6 +132,7 @@ int proc_nr_inodes(ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
inodes_stat.nr_inodes = get_nr_inodes();
+ inodes_stat.nr_unused = get_nr_inodes_unused();
return proc_dointvec(table, write, buffer, lenp, ppos);
}
#endif
@@ -340,7 +346,7 @@ static void inode_lru_list_add(struct inode *inode)
spin_lock(&inode_lru_lock);
if (list_empty(&inode->i_lru)) {
list_add(&inode->i_lru, &inode_lru);
- inodes_stat.nr_unused++;
+ this_cpu_inc(nr_unused);
}
spin_unlock(&inode_lru_lock);
}
@@ -350,7 +356,7 @@ static void inode_lru_list_del(struct inode *inode)
spin_lock(&inode_lru_lock);
if (!list_empty(&inode->i_lru)) {
list_del_init(&inode->i_lru);
- inodes_stat.nr_unused--;
+ this_cpu_dec(nr_unused);
}
spin_unlock(&inode_lru_lock);
}
@@ -656,7 +662,7 @@ static void prune_icache(int nr_to_scan)
(inode->i_state & ~I_REFERENCED)) {
list_del_init(&inode->i_lru);
spin_unlock(&inode->i_lock);
- inodes_stat.nr_unused--;
+ this_cpu_dec(nr_unused);
continue;
}
@@ -693,7 +699,7 @@ static void prune_icache(int nr_to_scan)
spin_unlock(&inode->i_lock);
list_move(&inode->i_lru, &freeable);
- inodes_stat.nr_unused--;
+ this_cpu_dec(nr_unused);
}
if (current_is_kswapd())
__count_vm_events(KSWAPD_INODESTEAL, reap);