* [PATCH] mm/memory-failure: do pgoff calculation before for_each_process()
@ 2020-08-18 8:26 Xianting Tian
2020-08-18 8:46 ` HORIGUCHI NAOYA(堀口 直也)
0 siblings, 1 reply; 2+ messages in thread
From: Xianting Tian @ 2020-08-18 8:26 UTC (permalink / raw)
To: naoya.horiguchi, akpm; +Cc: linux-mm, linux-kernel, Xianting Tian
There is no need to calcaulate pgoff in each loop of for_each_process(),
so move it to the place before for_each_process(), which can save some
CPU cycles.
Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
---
mm/memory-failure.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 47b8ccb1f..7dc2c9d3b 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -484,11 +484,12 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
struct vm_area_struct *vma;
struct task_struct *tsk;
struct address_space *mapping = page->mapping;
+ pgoff_t pgoff;
i_mmap_lock_read(mapping);
read_lock(&tasklist_lock);
+ pgoff = page_to_pgoff(page);
for_each_process(tsk) {
- pgoff_t pgoff = page_to_pgoff(page);
struct task_struct *t = task_early_kill(tsk, force_early);
if (!t)
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mm/memory-failure: do pgoff calculation before for_each_process()
2020-08-18 8:26 [PATCH] mm/memory-failure: do pgoff calculation before for_each_process() Xianting Tian
@ 2020-08-18 8:46 ` HORIGUCHI NAOYA(堀口 直也)
0 siblings, 0 replies; 2+ messages in thread
From: HORIGUCHI NAOYA(堀口 直也) @ 2020-08-18 8:46 UTC (permalink / raw)
To: Xianting Tian; +Cc: akpm, linux-mm, linux-kernel
On Tue, Aug 18, 2020 at 04:26:47PM +0800, Xianting Tian wrote:
> There is no need to calcaulate pgoff in each loop of for_each_process(),
> so move it to the place before for_each_process(), which can save some
> CPU cycles.
>
> Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
Looks good to me. Thank you.
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-08-18 8:26 [PATCH] mm/memory-failure: do pgoff calculation before for_each_process() Xianting Tian
2020-08-18 8:46 ` HORIGUCHI NAOYA(堀口 直也)
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