Reorganise the members of struct page.
- Place ->flags at the start so the compiler can generate indirect
addressing rather than indirect+indexed for this commonly-accessed
field. Shrinks the kernel by ~100 bytes.
- Keep ->count with ->flags so they have the best chance of
being in the same cacheline.
mm.h | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
--- 2.5.29/include/linux/mm.h~page-reorg Sat Jul 27 23:39:05 2002
+++ 2.5.29-akpm/include/linux/mm.h Sat Jul 27 23:49:00 2002
@@ -149,12 +149,12 @@ struct pte_chain;
* TODO: make this structure smaller, it could be as small as 32 bytes.
*/
struct page {
+ unsigned long flags; /* atomic flags, some possibly
+ updated asynchronously */
+ atomic_t count; /* Usage count, see below. */
struct list_head list; /* ->mapping has some page lists. */
struct address_space *mapping; /* The inode (or ...) we belong to. */
unsigned long index; /* Our offset within mapping. */
- atomic_t count; /* Usage count, see below. */
- unsigned long flags; /* atomic flags, some possibly
- updated asynchronously */
struct list_head lru; /* Pageout list, eg. active_list;
protected by pagemap_lru_lock !! */
union {
.
-
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This archive was generated by hypermail 2b29 : Tue Jul 30 2002 - 14:00:28 EST