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sysfs: use singly-linked list for sysfs_dirent tree

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Make sysfs_dirent use singly linked list for its tree structure.
sysfs_link_sibling() and sysfs_unlink_sibling() functions are added to
handle simpler cases.  It adds some complexity and cpu cycle overhead
but reduced memory footprint is worthwhile on big machines.

This change reduces the sizeof sysfs_dirent from 104 to 88 on 64bit
and from 60 to 52 on 32bit.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo
2007-06-14 03:45:18 +09:00
committed by Greg Kroah-Hartman
parent 8619f97989
commit 0c73f18b7d
4 changed files with 112 additions and 55 deletions
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3
fs/sysfs/mount.c
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@@ -26,11 +26,8 @@ static const struct super_operations sysfs_ops = {
static struct sysfs_dirent sysfs_root = {
.s_count = ATOMIC_INIT(1),
.s_sibling = LIST_HEAD_INIT(sysfs_root.s_sibling),
.s_children = LIST_HEAD_INIT(sysfs_root.s_children),
.s_type = SYSFS_ROOT,
.s_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
.s_iattr = NULL,
.s_ino = 1,
};