Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Mel Gorman wrote:
> > #define PG_checked               8      /* kill me in 2.5.<early>. */
> >
> > ?
> >
> > At least PG_uncached isn't used on many architectures too, so could
> > be reused. I don't know why those that use it don't check VMAs instead.
>
>
> PG_unchecked appears to be totally unused. It's only users are the macros
> that manipulate the bit and mm/page_alloc.c . It appears it has been a
> long time since it was used to it is a canditate for reuse.

Just a notification..
from 2.6.14

PageUncached      375 include/asm-ia64/uaccess.h 	if (PageUncached(page))
PageUncached      393 include/asm-ia64/uaccess.h 	if (PageUncached(page))

This is used by /dev/mem


PageChecked       196 fs/afs/dir.c   		if (!PageChecked(page))
PageChecked       169 fs/ext2/dir.c  		if (!PageChecked(page))
PageChecked      1372 fs/ext3/inode.c 	if (!page_has_buffers(page) || PageChecked(page)) {
PageChecked      1441 fs/ext3/inode.c 	WARN_ON(PageChecked(page));
PageChecked      2350 fs/reiserfs/inode.c 	int checked = PageChecked(page);
PageChecked      2853 fs/reiserfs/inode.c 	WARN_ON(PageChecked(page));

This is used by fs, now.

-- kame

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