The patch titled
mmap: save some cycles for the shared anonymous mapping
has been added to the -mm tree. Its filename is
mmap-save-some-cycles-for-the-shared-anonymous-mapping.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mmap: save some cycles for the shared anonymous mapping
From: Huang Shijie <shijie8@xxxxxxxxx>
shmem_zero_setup() does not change vm_start, pgoff or vm_flags, only some
drivers change them (such as /driver/video/bfin-t350mcqb-fb.c).
Move these codes to a more proper place to save cycles for shared
anonymous mapping.
Signed-off-by: Huang Shijie <shijie8@xxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff -puN mm/mmap.c~mmap-save-some-cycles-for-the-shared-anonymous-mapping mm/mmap.c
--- a/mm/mmap.c~mmap-save-some-cycles-for-the-shared-anonymous-mapping
+++ a/mm/mmap.c
@@ -1210,21 +1210,21 @@ munmap_back:
goto unmap_and_free_vma;
if (vm_flags & VM_EXECUTABLE)
added_exe_file_vma(mm);
+
+ /* Can addr have changed??
+ *
+ * Answer: Yes, several device drivers can do it in their
+ * f_op->mmap method. -DaveM
+ */
+ addr = vma->vm_start;
+ pgoff = vma->vm_pgoff;
+ vm_flags = vma->vm_flags;
} else if (vm_flags & VM_SHARED) {
error = shmem_zero_setup(vma);
if (error)
goto free_vma;
}
- /* Can addr have changed??
- *
- * Answer: Yes, several device drivers can do it in their
- * f_op->mmap method. -DaveM
- */
- addr = vma->vm_start;
- pgoff = vma->vm_pgoff;
- vm_flags = vma->vm_flags;
-
if (vma_wants_writenotify(vma))
vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED);
_
Patches currently in -mm which might be from shijie8@xxxxxxxxx are
mmap-remove-unnecessary-code.patch
mmap-save-some-cycles-for-the-shared-anonymous-mapping.patch
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