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>

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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 111 additions and 54 deletions

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148

fs/sysfs/dir.c

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12

fs/sysfs/inode.c

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3

fs/sysfs/mount.c

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4

fs/sysfs/sysfs.h

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