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authorHugh Dickins <hugh@veritas.com>2005-09-03 18:54:34 -0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 03:05:40 -0400
commit11d31886dbcb61039ed3789e583d21c6e70960fd (patch)
treeddaebfd35080a530a30c56587707c2c5ef452591 /include/linux/swap.h
parent4cd3bb10ff0b21b77b5a4cd13b4bd36694e054c4 (diff)
[PATCH] swap: swap extent list is ordered
There are several comments that swap's extent_list.prev points to the lowest extent: that's not so, it's extent_list.next which points to it, as you'd expect. And a couple of loops in add_swap_extent which go all the way through the list, when they should just add to the other end. Fix those up, and let map_swap_page search the list forwards: profiles shows it to be twice as quick that way - because prefetch works better on how the structs are typically kmalloc'ed? or because usually more is written to than read from swap, and swap is allocated ascendingly? Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index bfe3e763ccf2..38f288475e67 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -116,8 +116,6 @@ enum {
116 116
117/* 117/*
118 * The in-memory structure used to track swap areas. 118 * The in-memory structure used to track swap areas.
119 * extent_list.prev points at the lowest-index extent. That list is
120 * sorted.
121 */ 119 */
122struct swap_info_struct { 120struct swap_info_struct {
123 unsigned int flags; 121 unsigned int flags;