lkml.org 
[lkml]   [2007]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC 13/26] SLUB: Add SlabReclaimable() to avoid repeated reclaim attempts
Christoph Lameter wrote:
> Add a flag SlabReclaimable() that is set on slabs with a method
> that allows defrag/reclaim. Clear the flag if a reclaim action is not
> successful in reducing the number of objects in a slab. The reclaim
> flag is set again if all objects have been allocated from it.
>
> Signed-off-by: Christoph Lameter <clameter@sgi.com>
> ---
> mm/slub.c | 42 ++++++++++++++++++++++++++++++++++++------
> 1 file changed, 36 insertions(+), 6 deletions(-)
>
> Index: linux-2.6/mm/slub.c
> ===================================================================
> --- linux-2.6.orig/mm/slub.c 2007-08-28 20:10:37.000000000 -0700
> +++ linux-2.6/mm/slub.c 2007-08-28 20:10:47.000000000 -0700
> @@ -107,6 +107,8 @@
> #define SLABDEBUG 0
> #endif
>
> +#define SLABRECLAIMABLE (1 << PG_dirty)
> +
> static inline int SlabFrozen(struct page *page)
> {
> return page->flags & FROZEN;
> @@ -137,6 +139,21 @@ static inline void ClearSlabDebug(struct
> page->flags &= ~SLABDEBUG;
> }
>
> +static inline int SlabReclaimable(struct page *page)
> +{
> + return page->flags & SLABRECLAIMABLE;
> +}
> +
> +static inline void SetSlabReclaimable(struct page *page)
> +{
> + page->flags |= SLABRECLAIMABLE;
> +}
> +
> +static inline void ClearSlabReclaimable(struct page *page)
> +{
> + page->flags &= ~SLABRECLAIMABLE;
> +}

Why is it safe to not use the normal page flag bit operators
for these page flags operations?

--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-19 17:11    [W:0.123 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site