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Message-Id: <20090611192600.6D50.A69D9226@jp.fujitsu.com>
Date: Thu, 11 Jun 2009 19:26:48 +0900 (JST)
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To: linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Cc: kosaki.motohiro@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
Wu Fengguang <fengguang.wu@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH for mmotm 2/5]
Changes since Wu's original patch
- adding vmstat
- rename NR_TMPFS_MAPPED to NR_SWAP_BACKED_FILE_MAPPED
----------------------
Subject: [PATCH] introduce NR_SWAP_BACKED_FILE_MAPPED zone stat
Desirable zone reclaim implementaion want to know the number of
file-backed and unmapped pages.
Thus, we need to know number of swap-backed mapped pages for
calculate above number.
Cc: Mel Gorman <mel@....ul.ie>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
include/linux/mmzone.h | 2 ++
mm/rmap.c | 7 +++++++
mm/vmstat.c | 1 +
3 files changed, 10 insertions(+)
Index: b/include/linux/mmzone.h
===================================================================
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -88,6 +88,8 @@ enum zone_stat_item {
NR_ANON_PAGES, /* Mapped anonymous pages */
NR_FILE_MAPPED, /* pagecache pages mapped into pagetables.
only modified from process context */
+ NR_SWAP_BACKED_FILE_MAPPED, /* Similar to NR_FILE_MAPPED. but
+ only account swap-backed pages */
NR_FILE_PAGES,
NR_FILE_DIRTY,
NR_WRITEBACK,
Index: b/mm/rmap.c
===================================================================
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -829,6 +829,10 @@ void page_add_file_rmap(struct page *pag
{
if (atomic_inc_and_test(&page->_mapcount)) {
__inc_zone_page_state(page, NR_FILE_MAPPED);
+ if (PageSwapBacked(page))
+ __inc_zone_page_state(page,
+ NR_SWAP_BACKED_FILE_MAPPED);
+
mem_cgroup_update_mapped_file_stat(page, 1);
}
}
@@ -884,6 +888,9 @@ void page_remove_rmap(struct page *page)
__dec_zone_page_state(page, NR_ANON_PAGES);
} else {
__dec_zone_page_state(page, NR_FILE_MAPPED);
+ if (PageSwapBacked(page))
+ __dec_zone_page_state(page,
+ NR_SWAP_BACKED_FILE_MAPPED);
}
mem_cgroup_update_mapped_file_stat(page, -1);
/*
Index: b/mm/vmstat.c
===================================================================
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -633,6 +633,7 @@ static const char * const vmstat_text[]
"nr_mlock",
"nr_anon_pages",
"nr_mapped",
+ "nr_swap_backed_file_mapped",
"nr_file_pages",
"nr_dirty",
"nr_writeback",
--
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