The patch titled
Subject: mm/memory.c: share the i_mmap_rwsem
has been added to the -mm tree. Its filename is
mm-memoryc-share-the-i_mmap_rwsem.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memoryc-share-the-i_mmap_rwsem.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/mm-memoryc-share-the-i_mmap_rwsem.patch
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------------------------------------------------------
From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Subject: mm/memory.c: share the i_mmap_rwsem
The unmap_mapping_range family of functions do the unmapping of user pages
(ultimately via zap_page_range_single) without touching the actual
interval tree, thus share the lock.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/memory.c~mm-memoryc-share-the-i_mmap_rwsem mm/memory.c
--- a/mm/memory.c~mm-memoryc-share-the-i_mmap_rwsem
+++ a/mm/memory.c
@@ -2392,12 +2392,12 @@ void unmap_mapping_range(struct address_
details.last_index = ULONG_MAX;
- i_mmap_lock_write(mapping);
+ i_mmap_lock_read(mapping);
if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
unmap_mapping_range_tree(&mapping->i_mmap, &details);
if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
- i_mmap_unlock_write(mapping);
+ i_mmap_unlock_read(mapping);
}
EXPORT_SYMBOL(unmap_mapping_range);
_
Patches currently in -mm which might be from dave@xxxxxxxxxxxx are
mmfs-introduce-helpers-around-the-i_mmap_mutex.patch
mm-use-new-helper-functions-around-the-i_mmap_mutex.patch
mm-convert-i_mmap_mutex-to-rwsem.patch
mm-rmap-share-the-i_mmap_rwsem.patch
uprobes-share-the-i_mmap_rwsem.patch
mm-xip-share-the-i_mmap_rwsem.patch
mm-memory-failure-share-the-i_mmap_rwsem.patch
mm-nommu-share-the-i_mmap_rwsem.patch
mm-memoryc-share-the-i_mmap_rwsem.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix-fix.patch
ipc-semc-increase-semmsl-semmni-semopm.patch
ipc-msg-increase-msgmni-remove-scaling.patch
ipc-msg-increase-msgmni-remove-scaling-checkpatch-fixes.patch
linux-next.patch
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