The patch titled
mm: simplify code of swap.c
has been added to the -mm tree. Its filename is
mm-simplify-code-of-swapc.patch
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out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: simplify code of swap.c
From: Shaohua Li <shaohua.li@xxxxxxxxx>
Clean up code and remove duplicate code. Next patch will use
pagevec_lru_move_fn introduced here too.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Hiroyuki Kamezawa <kamezawa.hiroyuki@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swap.c | 133 ++++++++++++++++++++++------------------------------
1 file changed, 58 insertions(+), 75 deletions(-)
diff -puN mm/swap.c~mm-simplify-code-of-swapc mm/swap.c
--- a/mm/swap.c~mm-simplify-code-of-swapc
+++ a/mm/swap.c
@@ -179,15 +179,13 @@ void put_pages_list(struct list_head *pa
}
EXPORT_SYMBOL(put_pages_list);
-/*
- * pagevec_move_tail() must be called with IRQ disabled.
- * Otherwise this may cause nasty races.
- */
-static void pagevec_move_tail(struct pagevec *pvec)
+static void pagevec_lru_move_fn(struct pagevec *pvec,
+ void (*move_fn)(struct page *page, void *arg),
+ void *arg)
{
int i;
- int pgmoved = 0;
struct zone *zone = NULL;
+ unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
@@ -195,30 +193,50 @@ static void pagevec_move_tail(struct pag
if (pagezone != zone) {
if (zone)
- spin_unlock(&zone->lru_lock);
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
zone = pagezone;
- spin_lock(&zone->lru_lock);
- }
- if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
- enum lru_list lru = page_lru_base_type(page);
- list_move_tail(&page->lru, &zone->lru[lru].list);
- mem_cgroup_rotate_reclaimable_page(page);
- pgmoved++;
+ spin_lock_irqsave(&zone->lru_lock, flags);
}
+
+ (*move_fn)(page, arg);
}
if (zone)
- spin_unlock(&zone->lru_lock);
- __count_vm_events(PGROTATED, pgmoved);
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
release_pages(pvec->pages, pvec->nr, pvec->cold);
pagevec_reinit(pvec);
}
+static void pagevec_move_tail_fn(struct page *page, void *arg)
+{
+ int *pgmoved = arg;
+ struct zone *zone = page_zone(page);
+
+ if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
+ enum lru_list lru = page_lru_base_type(page);
+ list_move_tail(&page->lru, &zone->lru[lru].list);
+ mem_cgroup_rotate_reclaimable_page(page);
+ (*pgmoved)++;
+ }
+}
+
+/*
+ * pagevec_move_tail() must be called with IRQ disabled.
+ * Otherwise this may cause nasty races.
+ */
+static void pagevec_move_tail(struct pagevec *pvec)
+{
+ int pgmoved = 0;
+
+ pagevec_lru_move_fn(pvec, pagevec_move_tail_fn, &pgmoved);
+ __count_vm_events(PGROTATED, pgmoved);
+}
+
/*
* Writeback is about to end against a page which has been marked for immediate
* reclaim. If it still appears to be reclaimable, move it to the tail of the
* inactive list.
*/
-void rotate_reclaimable_page(struct page *page)
+void rotate_reclaimable_page(struct page *page)
{
if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) &&
!PageUnevictable(page) && PageLRU(page)) {
@@ -369,10 +387,11 @@ void add_page_to_unevictable_list(struct
* be write it out by flusher threads as this is much more effective
* than the single-page writeout from reclaim.
*/
-static void lru_deactivate(struct page *page, struct zone *zone)
+static void lru_deactivate_fn(struct page *page, void *arg)
{
int lru, file;
bool active;
+ struct zone *zone = page_zone(page);
if (!PageLRU(page))
return;
@@ -412,31 +431,6 @@ static void lru_deactivate(struct page *
update_page_reclaim_stat(zone, page, file, 0);
}
-static void ____pagevec_lru_deactivate(struct pagevec *pvec)
-{
- int i;
- struct zone *zone = NULL;
-
- for (i = 0; i < pagevec_count(pvec); i++) {
- struct page *page = pvec->pages[i];
- struct zone *pagezone = page_zone(page);
-
- if (pagezone != zone) {
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
- }
- lru_deactivate(page, zone);
- }
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
-
- release_pages(pvec->pages, pvec->nr, pvec->cold);
- pagevec_reinit(pvec);
-}
-
-
/*
* Drain pages out of the cpu's pagevecs.
* Either "cpu" is the current CPU, and preemption has already been
@@ -466,7 +460,7 @@ static void drain_cpu_pagevecs(int cpu)
pvec = &per_cpu(lru_deactivate_pvecs, cpu);
if (pagevec_count(pvec))
- ____pagevec_lru_deactivate(pvec);
+ pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
}
/**
@@ -483,7 +477,7 @@ void deactivate_page(struct page *page)
struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
if (!pagevec_add(pvec, page))
- ____pagevec_lru_deactivate(pvec);
+ pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
put_cpu_var(lru_deactivate_pvecs);
}
}
@@ -630,44 +624,33 @@ void lru_add_page_tail(struct zone* zone
}
}
+static void ____pagevec_lru_add_fn(struct page *page, void *arg)
+{
+ enum lru_list lru = (enum lru_list)arg;
+ struct zone *zone = page_zone(page);
+ int file = is_file_lru(lru);
+ int active = is_active_lru(lru);
+
+ VM_BUG_ON(PageActive(page));
+ VM_BUG_ON(PageUnevictable(page));
+ VM_BUG_ON(PageLRU(page));
+
+ SetPageLRU(page);
+ if (active)
+ SetPageActive(page);
+ update_page_reclaim_stat(zone, page, file, active);
+ add_page_to_lru_list(zone, page, lru);
+}
+
/*
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
{
- int i;
- struct zone *zone = NULL;
-
VM_BUG_ON(is_unevictable_lru(lru));
- for (i = 0; i < pagevec_count(pvec); i++) {
- struct page *page = pvec->pages[i];
- struct zone *pagezone = page_zone(page);
- int file;
- int active;
-
- if (pagezone != zone) {
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
- }
- VM_BUG_ON(PageActive(page));
- VM_BUG_ON(PageUnevictable(page));
- VM_BUG_ON(PageLRU(page));
- SetPageLRU(page);
- active = is_active_lru(lru);
- file = is_file_lru(lru);
- if (active)
- SetPageActive(page);
- update_page_reclaim_stat(zone, page, file, active);
- add_page_to_lru_list(zone, page, lru);
- }
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- release_pages(pvec->pages, pvec->nr, pvec->cold);
- pagevec_reinit(pvec);
+ pagevec_lru_move_fn(pvec, ____pagevec_lru_add_fn, (void *)lru);
}
EXPORT_SYMBOL(____pagevec_lru_add);
_
Patches currently in -mm which might be from shaohua.li@xxxxxxxxx are
linux-next.patch
mm-vmscan-kswapd-should-not-free-an-excessive-number-of-pages-when-balancing-small-zones.patch
mm-simplify-code-of-swapc.patch
mm-batch-activate_page-to-reduce-lock-contention.patch
fs-ioctlc-remove-unnecessary-variable.patch
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