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Subject[PATCH 09/13] mm: remove swap_cluster_max from scan_control
The use of sc.swap_cluster_max is weird and redundant.

The callers should just set sc.priority/sc.nr_to_reclaim, and let
shrink_zone() decide the proper loop parameters.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
---
mm/vmscan.c | 15 ++++-----------
1 files changed, 4 insertions(+), 11 deletions(-)
--- linux-2.6.15-rc5-mm1.orig/mm/vmscan.c
+++ linux-2.6.15-rc5-mm1/mm/vmscan.c
@@ -76,12 +76,6 @@ struct scan_control {

/* Can pages be swapped as part of reclaim? */
int may_swap;
-
- /* This context's SWAP_CLUSTER_MAX. If freeing memory for
- * suspend, we effectively ignore SWAP_CLUSTER_MAX.
- * In this context, it doesn't matter that we scan the
- * whole list at once. */
- int swap_cluster_max;
};

#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
@@ -1121,7 +1115,6 @@ shrink_zone(struct zone *zone, struct sc
nr_inactive &= ~(SWAP_CLUSTER_MAX - 1);

sc->nr_to_scan = SWAP_CLUSTER_MAX;
- sc->nr_to_reclaim = sc->swap_cluster_max;

while (nr_active >= SWAP_CLUSTER_MAX * 1024 || nr_inactive) {
if (nr_active >= SWAP_CLUSTER_MAX * 1024) {
@@ -1260,7 +1253,7 @@ int try_to_free_pages(struct zone **zone
sc.nr_scanned = 0;
sc.nr_reclaimed = 0;
sc.priority = priority;
- sc.swap_cluster_max = SWAP_CLUSTER_MAX;
+ sc.nr_to_reclaim = SWAP_CLUSTER_MAX;
if (!priority)
disable_swap_token();
shrink_caches(zones, &sc);
@@ -1272,7 +1265,7 @@ int try_to_free_pages(struct zone **zone
}
total_scanned += sc.nr_scanned;
total_reclaimed += sc.nr_reclaimed;
- if (total_reclaimed >= sc.swap_cluster_max) {
+ if (total_reclaimed >= SWAP_CLUSTER_MAX) {
ret = 1;
goto out;
}
@@ -1284,7 +1277,7 @@ int try_to_free_pages(struct zone **zone
* that's undesirable in laptop mode, where we *want* lumpy
* writeout. So in laptop mode, write out the whole world.
*/
- if (total_scanned > sc.swap_cluster_max + sc.swap_cluster_max/2) {
+ if (total_scanned > SWAP_CLUSTER_MAX * 3 / 2) {
wakeup_pdflush(laptop_mode ? 0 : total_scanned);
sc.may_writepage = 1;
}
@@ -1365,7 +1358,7 @@ loop_again:
sc.nr_scanned = 0;
sc.nr_reclaimed = 0;
sc.priority = priority;
- sc.swap_cluster_max = nr_pages ? nr_pages : SWAP_CLUSTER_MAX;
+ sc.nr_to_reclaim = nr_pages ? nr_pages : SWAP_CLUSTER_MAX;

/* The swap token gets in the way of swapout... */
if (!priority)
--
-
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