sysfs: use singly-linked list for sysfs_dirent tree

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

View File

@ -23,8 +23,8 @@ struct sysfs_dirent {
atomic_t s_count;
atomic_t s_active;
struct sysfs_dirent * s_parent;
struct list_head s_sibling;
struct list_head s_children;
struct sysfs_dirent * s_sibling;
struct sysfs_dirent * s_children;
const char * s_name;
union {