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authorMikulas Patocka <mpatocka@redhat.com>2011-07-21 19:59:22 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-22 17:43:30 -0700
commit7f9838fd01833ffb30177d964983076924344c9e (patch)
tree95487aa8962c0baaed05375f739a4a16a566a388 /fs/sysfs/sysfs.h
parent86028619b9f653a30f5aa0d331fdedd899a1eea5 (diff)
downloadop-kernel-dev-7f9838fd01833ffb30177d964983076924344c9e.zip
op-kernel-dev-7f9838fd01833ffb30177d964983076924344c9e.tar.gz
sysfs: count subdirectories
sysfs: count subdirectories This patch introduces a subdirectory counter for each sysfs directory. Without the patch, sysfs_refresh_inode would walk all entries of the directory to calculate the number of subdirectories. This patch improves time of "ls -la /sys/block" when there are 10000 block devices from 9 seconds to 0.19 seconds. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/sysfs.h')
-rw-r--r--fs/sysfs/sysfs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 845ab3a..6348e2c 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -19,6 +19,8 @@ struct sysfs_elem_dir {
struct kobject *kobj;
/* children list starts here and goes through sd->s_sibling */
struct sysfs_dirent *children;
+
+ unsigned long subdirs;
};
struct sysfs_elem_symlink {
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