linux-kernel - [patch 3/4] mm: page-writeback: inline account_page

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Date:	Tue, 21 Oct 2014 16:21:35 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 3/4] mm: page-writeback: inline account_page_dirtied() into single caller

A follow-up patch would have changed the call signature.  To save the
trouble, just fold it instead.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 include/linux/mm.h  |  1 -
 mm/page-writeback.c | 23 ++++-------------------
 2 files changed, 4 insertions(+), 20 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 27eb1bfbe704..b46461116cd2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1235,7 +1235,6 @@ int __set_page_dirty_no_writeback(struct page *page);
 int redirty_page_for_writepage(struct writeback_control *wbc,
 				struct page *page);
 void account_page_dirtied(struct page *page, struct address_space *mapping);
-void account_page_writeback(struct page *page);
 int set_page_dirty(struct page *page);
 int set_page_dirty_lock(struct page *page);
 int clear_page_dirty_for_io(struct page *page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index ff24c9d83112..ff6a5b07211e 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2116,23 +2116,6 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 EXPORT_SYMBOL(account_page_dirtied);
 
 /*
- * Helper function for set_page_writeback family.
- *
- * The caller must hold mem_cgroup_begin/end_update_page_stat() lock
- * while calling this function.
- * See test_set_page_writeback for example.
- *
- * NOTE: Unlike account_page_dirtied this does not rely on being atomic
- * wrt interrupts.
- */
-void account_page_writeback(struct page *page)
-{
-	mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
-	inc_zone_page_state(page, NR_WRITEBACK);
-}
-EXPORT_SYMBOL(account_page_writeback);
-
-/*
  * For address_spaces which do not use buffers.  Just tag the page as dirty in
  * its radix tree.
  *
@@ -2410,8 +2393,10 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
 	} else {
 		ret = TestSetPageWriteback(page);
 	}
-	if (!ret)
-		account_page_writeback(page);
+	if (!ret) {
+		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
+		inc_zone_page_state(page, NR_WRITEBACK);
+	}
 	mem_cgroup_end_update_page_stat(page, &locked, &memcg_flags);
 	return ret;
 
-- 
2.1.2

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