The isolate_pages() level in vmscan.c offers little but indirection:
merge it into isolate_lru_pages() as the compiler does, and use the
names nr_to_scan and nr_scanned in each case.
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
mm/vmscan.c | 61 ++++++++++++++++++++++----------------------------
1 file changed, 27 insertions(+), 34 deletions(-)
--- mmotm.orig/mm/vmscan.c 2011-12-30 21:21:34.651338587 -0800
+++ mmotm/mm/vmscan.c 2011-12-30 21:30:02.315350653 -0800
@@ -1136,25 +1136,36 @@ int __isolate_lru_page(struct page *page
* Appropriate locks must be held before calling this function.
*
* @nr_to_scan: The number of pages to look through on the list.
- * @src: The LRU list to pull pages off.
+ * @mz: The mem_cgroup_zone to pull pages from.
* @dst: The temp list to put pages on to.
- * @scanned: The number of pages that were scanned.
+ * @nr_scanned: The number of pages that were scanned.
* @order: The caller's attempted allocation order
* @mode: One of the LRU isolation modes
+ * @active: True [1] if isolating active pages
* @file: True [1] if isolating file [!anon] pages
*
* returns how many pages were moved onto *@dst.
*/
static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
- struct list_head *src, struct list_head *dst,
- unsigned long *scanned, int order, isolate_mode_t mode,
- int file)
+ struct mem_cgroup_zone *mz, struct list_head *dst,
+ unsigned long *nr_scanned, int order, isolate_mode_t mode,
+ int active, int file)
{
+ struct lruvec *lruvec;
+ struct list_head *src;
unsigned long nr_taken = 0;
unsigned long nr_lumpy_taken = 0;
unsigned long nr_lumpy_dirty = 0;
unsigned long nr_lumpy_failed = 0;
unsigned long scan;
+ int lru = LRU_BASE;
+
+ lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
+ if (active)
+ lru += LRU_ACTIVE;
+ if (file)
+ lru += LRU_FILE;
+ src = &lruvec->lists[lru];
for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
struct page *page;
@@ -1263,7 +1274,7 @@ static unsigned long isolate_lru_pages(u
nr_lumpy_failed++;
}
- *scanned = scan;
+ *nr_scanned = scan;
trace_mm_vmscan_lru_isolate(order,
nr_to_scan, scan,
@@ -1273,23 +1284,6 @@ static unsigned long isolate_lru_pages(u
return nr_taken;
}
-static unsigned long isolate_pages(unsigned long nr, struct mem_cgroup_zone *mz,
- struct list_head *dst,
- unsigned long *scanned, int order,
- isolate_mode_t mode, int active, int file)
-{
- struct lruvec *lruvec;
- int lru = LRU_BASE;
-
- lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
- if (active)
- lru += LRU_ACTIVE;
- if (file)
- lru += LRU_FILE;
- return isolate_lru_pages(nr, &lruvec->lists[lru], dst,
- scanned, order, mode, file);
-}
-
/*
* clear_active_flags() is a helper for shrink_active_list(), clearing
* any active bits from the pages in the list.
@@ -1559,9 +1553,9 @@ shrink_inactive_list(unsigned long nr_to
spin_lock_irq(&zone->lru_lock);
- nr_taken = isolate_pages(nr_to_scan, mz, &page_list,
- &nr_scanned, sc->order,
- reclaim_mode, 0, file);
+ nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list,
+ &nr_scanned, sc->order,
+ reclaim_mode, 0, file);
if (global_reclaim(sc)) {
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
@@ -1700,13 +1694,13 @@ static void move_active_pages_to_lru(str
__count_vm_events(PGDEACTIVATE, pgmoved);
}
-static void shrink_active_list(unsigned long nr_pages,
+static void shrink_active_list(unsigned long nr_to_scan,
struct mem_cgroup_zone *mz,
struct scan_control *sc,
int priority, int file)
{
unsigned long nr_taken;
- unsigned long pgscanned;
+ unsigned long nr_scanned;
unsigned long vm_flags;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
@@ -1726,16 +1720,15 @@ static void shrink_active_list(unsigned
spin_lock_irq(&zone->lru_lock);
- nr_taken = isolate_pages(nr_pages, mz, &l_hold,
- &pgscanned, sc->order,
- reclaim_mode, 1, file);
-
+ nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold,
+ &nr_scanned, sc->order,
+ reclaim_mode, 1, file);
if (global_reclaim(sc))
- zone->pages_scanned += pgscanned;
+ zone->pages_scanned += nr_scanned;
reclaim_stat->recent_scanned[file] += nr_taken;
- __count_zone_vm_events(PGREFILL, zone, pgscanned);
+ __count_zone_vm_events(PGREFILL, zone, nr_scanned);
if (file)
__mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
else
--
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