Commit bf02cf4b authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[PATCH] zoned vm counters: remove NR_FILE_MAPPED from scan control structure 



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.

[akpm@osdl.org: bugfix]
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 347ce434

mm/vmscan.c

+2 −9
Original line number Diff line number Diff line
@@ -47,8 +47,6 @@ 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;
@@ -744,7 +742,8 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone, 
		 * how much memory

		 * is mapped.

		 */

		mapped_ratio = (sc->nr_mapped * 100) / vm_total_pages;

		mapped_ratio = (global_page_state(NR_FILE_MAPPED) * 100) /

					vm_total_pages;



		/*

		 * Now decide how much we really want to unmap some pages.  The
@@ -990,7 +989,6 @@ unsigned long try_to_free_pages(struct zone **zones, gfp_t gfp_mask) 
	}



	for (priority = DEF_PRIORITY; priority >= 0; priority--) {

		sc.nr_mapped = global_page_state(NR_FILE_MAPPED);

		sc.nr_scanned = 0;

		if (!priority)

			disable_swap_token();
@@ -1075,8 +1073,6 @@ loop_again: 
	total_scanned = 0;

	nr_reclaimed = 0;

	sc.may_writepage = !laptop_mode;

	sc.nr_mapped = global_page_state(NR_FILE_MAPPED);



	inc_page_state(pageoutrun);



	for (i = 0; i < pgdat->nr_zones; i++) {
@@ -1407,9 +1403,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages) 
		for (prio = DEF_PRIORITY; prio >= 0; prio--) {

			unsigned long nr_to_scan = nr_pages - ret;



			sc.nr_mapped = global_page_state(NR_FILE_MAPPED);

			sc.nr_scanned = 0;



			ret += shrink_all_zones(nr_to_scan, prio, pass, &sc);

			if (ret >= nr_pages)

				goto out;
@@ -1548,7 +1542,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) 
	struct scan_control sc = {

		.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),

		.may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),

		.nr_mapped = global_page_state(NR_FILE_MAPPED),

		.swap_cluster_max = max_t(unsigned long, nr_pages,

					SWAP_CLUSTER_MAX),

		.gfp_mask = gfp_mask,

CRA Git | Maintained and supported by SUSTech CRA and CCSE