[PATCH 07/10] mm/memory-failure: share the i_mmap_rwsem

From: Davidlohr Bueso
Date: Thu Oct 30 2014 - 15:43:22 EST


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@xxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
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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