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

From: KAMEZAWA Hiroyuki
Date: Tue Nov 22 2005 - 05:54:55 EST

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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