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Subject[RFC 3/7] shrink_page_list: Support isolating dirty pages on laundry list
If a laundry list is specified then do not write out pages but put
dirty pages on a laundry list for later processing.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
mm/vmscan.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c 2007-08-19 23:13:28.000000000 -0700
+++ linux-2.6/mm/vmscan.c 2007-08-19 23:27:00.000000000 -0700
@@ -380,16 +380,22 @@ cannot_free:
}

/*
- * shrink_page_list() returns the number of reclaimed pages
+ * shrink_page_list() returns the number of reclaimed pages.
+ *
+ * If laundry is specified then dirty pages are put onto the
+ * laundry list and no writes are triggered.
*/
static unsigned long shrink_page_list(struct list_head *page_list,
- struct scan_control *sc)
+ struct scan_control *sc, struct list_head *laundry)
{
LIST_HEAD(ret_pages);
struct pagevec freed_pvec;
int pgactivate = 0;
unsigned long nr_reclaimed = 0;

+ if (list_empty(page_list))
+ return 0;
+
cond_resched();

pagevec_init(&freed_pvec, 1);
@@ -407,10 +413,11 @@ static unsigned long shrink_page_list(st
if (TestSetPageLocked(page))
goto keep;

- VM_BUG_ON(PageActive(page));
-
sc->nr_scanned++;

+ if (PageActive(page))
+ goto keep_locked;
+
if (!sc->may_swap && page_mapped(page))
goto keep_locked;

@@ -506,6 +513,12 @@ static unsigned long shrink_page_list(st
if (!may_write_to_queue(mapping->backing_dev_info))
goto keep_locked;

+ if (laundry) {
+ list_add(&page->lru, laundry);
+ unlock_page(page);
+ continue;
+ }
+
/* Page is dirty, try to write it out here */
switch(pageout(page, mapping)) {
case PAGE_ACTIVATE:
@@ -817,7 +830,7 @@ static unsigned long shrink_inactive_lis
spin_unlock_irq(&zone->lru_lock);

nr_scanned += nr_scan;
- nr_freed = shrink_page_list(&page_list, sc);
+ nr_freed = shrink_page_list(&page_list, sc, NULL);
nr_reclaimed += nr_freed;
local_irq_disable();
if (current_is_kswapd()) {
--
-
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