From: xu xin <xu.xin16@zte.com.cn>

There are two perfomance optimization patches for rmap_walk_ksm.

The patch [1/2] move the initializaion of addr from the position inside loop
to the position before the loop, since the variable will not change in the
loop.

The patch [2/2] optimize rmap_walk_ksm by passing a suitable page offset range
to the anon_vma_interval_tree_foreach loop to reduce ineffective checks.

The metric performance is seen at patch[2/2].

xu xin (2):
ksm: Initialize the addr only once in rmap_walk_ksm
ksm: Optimize rmap_walk_ksm by passing a suitable address range

mm/ksm.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

--
2.25.1

On 2/6/26 10:56, xu.xin16@zte.com.cn wrote:
> From: xu xin <xu.xin16@zte.com.cn>
> 
> There are two perfomance optimization patches for rmap_walk_ksm.
> 
> The patch [1/2] move the initializaion of addr from the position inside loop
> to the position before the loop, since the variable will not change in the
> loop.
> 
> The patch [2/2] optimize rmap_walk_ksm by passing a suitable page offset range
> to the anon_vma_interval_tree_foreach loop to reduce ineffective checks.
> 
> The metric performance is seen at patch[2/2].

For the future, we usually describe what changed between versions 
briefly in the cover letter. Thanks!

-- 
Cheers,

David