Subject: [to-be-updated] dcache-convert-dentry_statnr_unused-to-per-cpu-counters.patch removed from -mm tree
To: dchinner@xxxxxxxxxx,glommer@xxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 06 Jun 2013 12:34:23 -0700
The patch titled
Subject: dcache: convert dentry_stat.nr_unused to per-cpu counters
has been removed from the -mm tree. Its filename was
dcache-convert-dentry_statnr_unused-to-per-cpu-counters.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Dave Chinner <dchinner@xxxxxxxxxx>
Subject: dcache: convert dentry_stat.nr_unused to per-cpu counters
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.
Cc: Glauber Costa <glommer@xxxxxxxxxx>
Cc: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dcache.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff -puN fs/dcache.c~dcache-convert-dentry_statnr_unused-to-per-cpu-counters fs/dcache.c
--- a/fs/dcache.c~dcache-convert-dentry_statnr_unused-to-per-cpu-counters
+++ a/fs/dcache.c
@@ -118,8 +118,10 @@ struct dentry_stat_t dentry_stat = {
};
static DEFINE_PER_CPU(long, nr_dentry);
+static DEFINE_PER_CPU(long, nr_dentry_unused);
#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
+/* scan possible cpus instead of online and avoid worrying about CPU hotplug. */
static long get_nr_dentry(void)
{
int i;
@@ -129,10 +131,20 @@ static long get_nr_dentry(void)
return sum < 0 ? 0 : sum;
}
+static long get_nr_dentry_unused(void)
+{
+ int i;
+ long 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_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
#endif
@@ -312,7 +324,7 @@ static void dentry_lru_add(struct 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 +334,7 @@ static void __dentry_lru_del(struct dent
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);
}
/*
@@ -343,7 +355,7 @@ static void dentry_lru_move_list(struct
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);
}
_
Patches currently in -mm which might be from dchinner@xxxxxxxxxx are
linux-next.patch
dentry-move-to-per-sb-lru-locks.patch
dcache-remove-dentries-from-lru-before-putting-on-dispose-list.patch
dcache-remove-dentries-from-lru-before-putting-on-dispose-list-fix.patch
mm-new-shrinker-api.patch
shrinker-convert-superblock-shrinkers-to-new-api.patch
list-add-a-new-lru-list-type.patch
inode-convert-inode-lru-list-to-generic-lru-list-code.patch
dcache-convert-to-use-new-lru-list-infrastructure.patch
list_lru-per-node-list-infrastructure.patch
shrinker-add-node-awareness.patch
vmscan-per-node-deferred-work.patch
list_lru-per-node-api.patch
fs-convert-inode-and-dentry-shrinking-to-be-node-aware.patch
xfs-convert-buftarg-lru-to-generic-code.patch
xfs-rework-buffer-dispose-list-tracking.patch
xfs-convert-dquot-cache-lru-to-list_lru.patch
fs-convert-fs-shrinkers-to-new-scan-count-api.patch
drivers-convert-shrinkers-to-new-count-scan-api.patch
i915-bail-out-earlier-when-shrinker-cannot-acquire-mutex.patch
shrinker-convert-remaining-shrinkers-to-count-scan-api.patch
hugepage-convert-huge-zero-page-shrinker-to-new-shrinker-api.patch
shrinker-kill-old-shrink-api.patch
vmscan-also-shrink-slab-in-memcg-pressure.patch
memcglist_lru-duplicate-lrus-upon-kmemcg-creation.patch
lru-add-an-element-to-a-memcg-list.patch
list_lru-per-memcg-walks.patch
memcg-per-memcg-kmem-shrinking.patch
memcg-scan-cache-objects-hierarchically.patch
vmscan-take-at-least-one-pass-with-shrinkers.patch
super-targeted-memcg-reclaim.patch
memcg-move-initialization-to-memcg-creation.patch
vmpressure-in-kernel-notifications.patch
memcg-reap-dead-memcgs-upon-global-memory-pressure.patch
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