[PATCH 14/17] vmscan: add scan_control.priority

[Wu Fengguang]

It seems most vmscan functions need the priority parameter.
It will simplify code to put it into scan_control.

It will be referenced in the next patch. This patch could convert
the many exising functnions, but let's keep it simple at first.

Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 mm/vmscan.c |    4 ++++
 1 file changed, 4 insertions(+)

--- linux-next.orig/mm/vmscan.c	2010-09-10 13:13:41.000000000 +0800
+++ linux-next/mm/vmscan.c	2010-09-10 13:17:01.000000000 +0800
@@ -78,6 +78,8 @@ struct scan_control {
 
 	int order;
 
+	int priority;
+
 	/*
 	 * Intend to reclaim enough continuous memory rather than reclaim
 	 * enough amount of memory. i.e, mode for high order allocation.
@@ -1875,6 +1877,7 @@ static unsigned long do_try_to_free_page
 
 	for (priority = DEF_PRIORITY; priority >= 0; priority--) {
 		sc->nr_scanned = 0;
+		sc->priority = priority;
 		if (!priority)
 			disable_swap_token();
 		all_unreclaimable = shrink_zones(priority, zonelist, sc);
@@ -2127,6 +2130,7 @@ loop_again:
 			disable_swap_token();
 
 		all_zones_ok = 1;
+		sc.priority = priority;
 
 		/*
 		 * Scan in the highmem->dma direction for the highest


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