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[PATCH] swap: swap extent list is ordered

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2005-09-03 15:54:34 -07:00 • committed by Linus Torvalds
commit 11d31886db
2 changed files with 9 additions and 20 deletions
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2
include/linux/swap.h
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@ -116,8 +116,6 @@ enum {
/*
* The in-memory structure used to track swap areas.
* extent_list.prev points at the lowest-index extent. That list is
* sorted.
*/
struct swap_info_struct {
unsigned int flags;