linux-kernel - [PATCH 07/10] mm/memory-failure: share the i_mmap

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Message-Id: <1414697657-1678-8-git-send-email-dave@stgolabs.net>
Date:	Thu, 30 Oct 2014 12:34:14 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	akpm@...ux-foundation.org
Cc:	hughd@...gle.com, riel@...hat.com, mgorman@...e.de,
	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, dbueso@...e.de, linux-mm@...ck.org,
	Davidlohr Bueso <dave@...olabs.net>
Subject: [PATCH 07/10] mm/memory-failure: share the i_mmap_rwsem

No brainer conversion: collect_procs_file() only schedules
a process for later kill, share the lock, similarly to
the anon vma variant.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...el.linux.com>
---
 mm/memory-failure.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e1646fe..e619625 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -466,7 +466,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
 	struct task_struct *tsk;
 	struct address_space *mapping = page->mapping;
 
-	i_mmap_lock_write(mapping);
+	i_mmap_lock_read(mapping);
 	read_lock(&tasklist_lock);
 	for_each_process(tsk) {
 		pgoff_t pgoff = page_to_pgoff(page);
@@ -488,7 +488,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
 		}
 	}
 	read_unlock(&tasklist_lock);
-	i_mmap_unlock_write(mapping);
+	i_mmap_unlock_read(mapping);
 }
 
 /*
-- 
1.8.4.5

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