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[PATCH] zoned vm counters: remove NR_FILE_MAPPED from scan control structure 

We can now access the number of pages in a mapped state in an inexpensive way
in shrink_active_list.  So drop the nr_mapped field from scan_control.

[akpm@osdl.org: bugfix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-06-30 01:55:36 -07:00 committed by Linus Torvalds
parent 347ce434d5
commit bf02cf4b6c
1 changed files with 2 additions and 9 deletions
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11
mm/vmscan.c
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@ -47,8 +47,6 @@ struct scan_control {
/* Incremented by the number of inactive pages that were scanned */
unsigned long nr_scanned;
unsigned long nr_mapped; /* From page_state */
/* This context's GFP mask */
gfp_t gfp_mask;
@ -744,7 +742,8 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
* how much memory
* is mapped.
*/
mapped_ratio = (sc->nr_mapped * 100) / vm_total_pages;
mapped_ratio = (global_page_state(NR_FILE_MAPPED) * 100) /
vm_total_pages;
/*
* Now decide how much we really want to unmap some pages. The
@ -990,7 +989,6 @@ unsigned long try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
}
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
sc.nr_mapped = global_page_state(NR_FILE_MAPPED);
sc.nr_scanned = 0;
if (!priority)
disable_swap_token();
@ -1075,8 +1073,6 @@ loop_again:
total_scanned = 0;
nr_reclaimed = 0;
sc.may_writepage = !laptop_mode;
sc.nr_mapped = global_page_state(NR_FILE_MAPPED);
inc_page_state(pageoutrun);
for (i = 0; i < pgdat->nr_zones; i++) {
@ -1407,9 +1403,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
for (prio = DEF_PRIORITY; prio >= 0; prio--) {
unsigned long nr_to_scan = nr_pages - ret;
sc.nr_mapped = global_page_state(NR_FILE_MAPPED);
sc.nr_scanned = 0;
ret += shrink_all_zones(nr_to_scan, prio, pass, &sc);
if (ret >= nr_pages)
goto out;
@ -1548,7 +1542,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
struct scan_control sc = {
.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
.may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
.nr_mapped = global_page_state(NR_FILE_MAPPED),
.swap_cluster_max = max_t(unsigned long, nr_pages,
SWAP_CLUSTER_MAX),
.gfp_mask = gfp_mask,