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Subject[PATCH 06/21] Remove nr_mapped from scan controls structure
Subject: zoned VM stats: Remove nr_mapped from scan control
From: Christoph Lameter <clameter@sgi.com>

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.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

Index: linux-2.6.17-rc6-cl/mm/vmscan.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/vmscan.c 2006-06-13 10:16:55.059956905 -0700
+++ linux-2.6.17-rc6-cl/mm/vmscan.c 2006-06-13 10:17:36.276157024 -0700
@@ -48,8 +48,6 @@ 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;

@@ -749,7 +747,8 @@ static void shrink_active_list(unsigned
* how much memory
* is mapped.
*/
- mapped_ratio = (sc->nr_mapped * 100) / vm_total_pages;
+ mapped_ratio = (global_page_state(NR_MAPPED) * 100) /
+ vm_total_pages;

/*
* Now decide how much we really want to unmap some pages. The
@@ -996,7 +995,6 @@ unsigned long try_to_free_pages(struct z
}

for (priority = DEF_PRIORITY; priority >= 0; priority--) {
- sc.nr_mapped = global_page_state(NR_MAPPED);
sc.nr_scanned = 0;
if (!priority)
disable_swap_token();
@@ -1081,8 +1079,6 @@ loop_again:
total_scanned = 0;
nr_reclaimed = 0;
sc.may_writepage = !laptop_mode;
- sc.nr_mapped = global_page_state(NR_MAPPED);
-
inc_page_state(pageoutrun);

for (i = 0; i < pgdat->nr_zones; i++) {
@@ -1416,7 +1412,6 @@ unsigned long shrink_all_memory(unsigned
for (prio = DEF_PRIORITY; prio >= 0; prio--) {
unsigned long nr_to_scan = nr_pages - ret;

- sc.nr_mapped = global_page_state(NR_MAPPED);
sc.nr_scanned = 0;

ret += shrink_all_zones(nr_to_scan, prio, pass, &sc);
@@ -1558,7 +1553,6 @@ static int __zone_reclaim(struct zone *z
struct scan_control sc = {
.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
.may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
- .nr_mapped = global_page_state(NR_MAPPED),
.swap_cluster_max = max_t(unsigned long, nr_pages,
SWAP_CLUSTER_MAX),
.gfp_mask = gfp_mask,
-
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