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* [PATCH] mm/compaction: remove local variable is_lru
@ 2016-06-17  9:32 Ganesh Mahendran
  2016-06-17  9:49 ` Hillf Danton
  2016-06-17  9:50 ` Michal Hocko
  0 siblings, 2 replies; 9+ messages in thread
From: Ganesh Mahendran @ 2016-06-17  9:32 UTC (permalink / raw)
  To: linux-mm, linux-kernel
  Cc: akpm, vbabka, iamjoonsoo.kim, mhocko, hillf.zj, minchan,
	Ganesh Mahendran

local varialbe is_lru was used for tracking non-lru pages(such as
balloon pages).

But commit
112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
introduced a common framework for non-lru page migration and moved
the compound pages check before non-lru movable pages check.

So there is no need to use local variable is_lru.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
---
 mm/compaction.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index fbb7b38..780be7f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 	/* Time to isolate some pages for migration */
 	for (; low_pfn < end_pfn; low_pfn++) {
-		bool is_lru;
 
 		if (skip_on_failure && low_pfn >= next_skip_pfn) {
 			/*
@@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * It's possible to migrate LRU and non-lru movable pages.
 		 * Skip any other type of page
 		 */
-		is_lru = PageLRU(page);
-		if (!is_lru) {
+		if (!PageLRU(page)) {
 			/*
 			 * __PageMovable can return false positive so we need
 			 * to verify it under page_lock.
-- 
1.9.1

^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH] mm/compaction: remove local variable is_lru
@ 2016-06-17  9:32 Ganesh Mahendran
  2016-06-17  9:49 ` Hillf Danton
  2016-06-17  9:50 ` Michal Hocko
  0 siblings, 2 replies; 9+ messages in thread
From: Ganesh Mahendran @ 2016-06-17  9:32 UTC (permalink / raw)
  To: linux-mm, linux-kernel
  Cc: akpm, vbabka, iamjoonsoo.kim, mhocko, hillf.zj, minchan,
	Ganesh Mahendran

local varialbe is_lru was used for tracking non-lru pages(such as
balloon pages).

But commit
112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
introduced a common framework for non-lru page migration and moved
the compound pages check before non-lru movable pages check.

So there is no need to use local variable is_lru.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
---
 mm/compaction.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index fbb7b38..780be7f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 	/* Time to isolate some pages for migration */
 	for (; low_pfn < end_pfn; low_pfn++) {
-		bool is_lru;
 
 		if (skip_on_failure && low_pfn >= next_skip_pfn) {
 			/*
@@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * It's possible to migrate LRU and non-lru movable pages.
 		 * Skip any other type of page
 		 */
-		is_lru = PageLRU(page);
-		if (!is_lru) {
+		if (!PageLRU(page)) {
 			/*
 			 * __PageMovable can return false positive so we need
 			 * to verify it under page_lock.
-- 
1.9.1

--
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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
  2016-06-17  9:32 [PATCH] mm/compaction: remove local variable is_lru Ganesh Mahendran
@ 2016-06-17  9:49 ` Hillf Danton
  2016-06-17  9:50 ` Michal Hocko
  1 sibling, 0 replies; 9+ messages in thread
From: Hillf Danton @ 2016-06-17  9:49 UTC (permalink / raw)
  To: 'Ganesh Mahendran', linux-mm, linux-kernel
  Cc: akpm, vbabka, iamjoonsoo.kim, mhocko, minchan

> 
> local varialbe is_lru was used for tracking non-lru pages(such as
> balloon pages).
> 
> But commit
> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
> introduced a common framework for non-lru page migration and moved
> the compound pages check before non-lru movable pages check.
> 
> So there is no need to use local variable is_lru.
> 
> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
> ---

Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>

>  mm/compaction.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index fbb7b38..780be7f 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
> 
>  	/* Time to isolate some pages for migration */
>  	for (; low_pfn < end_pfn; low_pfn++) {
> -		bool is_lru;
> 
>  		if (skip_on_failure && low_pfn >= next_skip_pfn) {
>  			/*
> @@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  		 * It's possible to migrate LRU and non-lru movable pages.
>  		 * Skip any other type of page
>  		 */
> -		is_lru = PageLRU(page);
> -		if (!is_lru) {
> +		if (!PageLRU(page)) {
>  			/*
>  			 * __PageMovable can return false positive so we need
>  			 * to verify it under page_lock.
> --
> 1.9.1

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
@ 2016-06-17  9:49 ` Hillf Danton
  0 siblings, 0 replies; 9+ messages in thread
From: Hillf Danton @ 2016-06-17  9:49 UTC (permalink / raw)
  To: 'Ganesh Mahendran', linux-mm, linux-kernel
  Cc: akpm, vbabka, iamjoonsoo.kim, mhocko, minchan

> 
> local varialbe is_lru was used for tracking non-lru pages(such as
> balloon pages).
> 
> But commit
> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
> introduced a common framework for non-lru page migration and moved
> the compound pages check before non-lru movable pages check.
> 
> So there is no need to use local variable is_lru.
> 
> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
> ---

Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>

>  mm/compaction.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index fbb7b38..780be7f 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
> 
>  	/* Time to isolate some pages for migration */
>  	for (; low_pfn < end_pfn; low_pfn++) {
> -		bool is_lru;
> 
>  		if (skip_on_failure && low_pfn >= next_skip_pfn) {
>  			/*
> @@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  		 * It's possible to migrate LRU and non-lru movable pages.
>  		 * Skip any other type of page
>  		 */
> -		is_lru = PageLRU(page);
> -		if (!is_lru) {
> +		if (!PageLRU(page)) {
>  			/*
>  			 * __PageMovable can return false positive so we need
>  			 * to verify it under page_lock.
> --
> 1.9.1

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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see: http://www.linux-mm.org/ .
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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
  2016-06-17  9:32 [PATCH] mm/compaction: remove local variable is_lru Ganesh Mahendran
  2016-06-17  9:49 ` Hillf Danton
@ 2016-06-17  9:50 ` Michal Hocko
  2016-06-17 12:50   ` Vlastimil Babka
  1 sibling, 1 reply; 9+ messages in thread
From: Michal Hocko @ 2016-06-17  9:50 UTC (permalink / raw)
  To: Ganesh Mahendran
  Cc: linux-mm, linux-kernel, akpm, vbabka, iamjoonsoo.kim, hillf.zj, minchan

On Fri 17-06-16 17:32:51, Ganesh Mahendran wrote:
> local varialbe is_lru was used for tracking non-lru pages(such as
> balloon pages).
> 
> But commit
> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")

this commit sha is not stable because it is from the linux-next tree.

> introduced a common framework for non-lru page migration and moved
> the compound pages check before non-lru movable pages check.
> 
> So there is no need to use local variable is_lru.
> 
> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>

Other than that the patch looks ok and maybe it would be worth folding
into the mm-migrate-support-non-lru-movable-page-migration.patch

> ---
>  mm/compaction.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index fbb7b38..780be7f 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  
>  	/* Time to isolate some pages for migration */
>  	for (; low_pfn < end_pfn; low_pfn++) {
> -		bool is_lru;
>  
>  		if (skip_on_failure && low_pfn >= next_skip_pfn) {
>  			/*
> @@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  		 * It's possible to migrate LRU and non-lru movable pages.
>  		 * Skip any other type of page
>  		 */
> -		is_lru = PageLRU(page);
> -		if (!is_lru) {
> +		if (!PageLRU(page)) {
>  			/*
>  			 * __PageMovable can return false positive so we need
>  			 * to verify it under page_lock.
> -- 
> 1.9.1
> 

-- 
Michal Hocko
SUSE Labs

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
@ 2016-06-17  9:50 ` Michal Hocko
  2016-06-17 12:50   ` Vlastimil Babka
  0 siblings, 1 reply; 9+ messages in thread
From: Michal Hocko @ 2016-06-17  9:50 UTC (permalink / raw)
  To: Ganesh Mahendran
  Cc: linux-mm, linux-kernel, akpm, vbabka, iamjoonsoo.kim, hillf.zj, minchan

On Fri 17-06-16 17:32:51, Ganesh Mahendran wrote:
> local varialbe is_lru was used for tracking non-lru pages(such as
> balloon pages).
> 
> But commit
> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")

this commit sha is not stable because it is from the linux-next tree.

> introduced a common framework for non-lru page migration and moved
> the compound pages check before non-lru movable pages check.
> 
> So there is no need to use local variable is_lru.
> 
> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>

Other than that the patch looks ok and maybe it would be worth folding
into the mm-migrate-support-non-lru-movable-page-migration.patch

> ---
>  mm/compaction.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index fbb7b38..780be7f 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  
>  	/* Time to isolate some pages for migration */
>  	for (; low_pfn < end_pfn; low_pfn++) {
> -		bool is_lru;
>  
>  		if (skip_on_failure && low_pfn >= next_skip_pfn) {
>  			/*
> @@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  		 * It's possible to migrate LRU and non-lru movable pages.
>  		 * Skip any other type of page
>  		 */
> -		is_lru = PageLRU(page);
> -		if (!is_lru) {
> +		if (!PageLRU(page)) {
>  			/*
>  			 * __PageMovable can return false positive so we need
>  			 * to verify it under page_lock.
> -- 
> 1.9.1
> 

-- 
Michal Hocko
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
  2016-06-17  9:50 ` Michal Hocko
@ 2016-06-17 12:50   ` Vlastimil Babka
  2016-06-18  1:48     ` Ganesh Mahendran
  0 siblings, 1 reply; 9+ messages in thread
From: Vlastimil Babka @ 2016-06-17 12:50 UTC (permalink / raw)
  To: Michal Hocko, Ganesh Mahendran
  Cc: linux-mm, linux-kernel, akpm, iamjoonsoo.kim, hillf.zj, minchan

On 06/17/2016 11:50 AM, Michal Hocko wrote:
> On Fri 17-06-16 17:32:51, Ganesh Mahendran wrote:
>> local varialbe is_lru was used for tracking non-lru pages(such as
>> balloon pages).
>>
>> But commit
>> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
>
> this commit sha is not stable because it is from the linux-next tree.
>
>> introduced a common framework for non-lru page migration and moved
>> the compound pages check before non-lru movable pages check.
>>
>> So there is no need to use local variable is_lru.
>>
>> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
>
> Other than that the patch looks ok and maybe it would be worth folding
> into the mm-migrate-support-non-lru-movable-page-migration.patch

Agreed.

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
@ 2016-06-17 12:50   ` Vlastimil Babka
  2016-06-18  1:48     ` Ganesh Mahendran
  0 siblings, 1 reply; 9+ messages in thread
From: Vlastimil Babka @ 2016-06-17 12:50 UTC (permalink / raw)
  To: Michal Hocko, Ganesh Mahendran
  Cc: linux-mm, linux-kernel, akpm, iamjoonsoo.kim, hillf.zj, minchan

On 06/17/2016 11:50 AM, Michal Hocko wrote:
> On Fri 17-06-16 17:32:51, Ganesh Mahendran wrote:
>> local varialbe is_lru was used for tracking non-lru pages(such as
>> balloon pages).
>>
>> But commit
>> 112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
>
> this commit sha is not stable because it is from the linux-next tree.
>
>> introduced a common framework for non-lru page migration and moved
>> the compound pages check before non-lru movable pages check.
>>
>> So there is no need to use local variable is_lru.
>>
>> Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
>
> Other than that the patch looks ok and maybe it would be worth folding
> into the mm-migrate-support-non-lru-movable-page-migration.patch

Agreed.


--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH] mm/compaction: remove local variable is_lru
  2016-06-17 12:50   ` Vlastimil Babka
@ 2016-06-18  1:48     ` Ganesh Mahendran
  0 siblings, 0 replies; 9+ messages in thread
From: Ganesh Mahendran @ 2016-06-18  1:48 UTC (permalink / raw)
  To: Vlastimil Babka, akpm
  Cc: Michal Hocko, linux-mm, linux-kernel, iamjoonsoo.kim, hillf.zj, minchan

On Fri, Jun 17, 2016 at 02:50:12PM +0200, Vlastimil Babka wrote:
> On 06/17/2016 11:50 AM, Michal Hocko wrote:
> >On Fri 17-06-16 17:32:51, Ganesh Mahendran wrote:
> >>local varialbe is_lru was used for tracking non-lru pages(such as
> >>balloon pages).
> >>
> >>But commit
> >>112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
> >
> >this commit sha is not stable because it is from the linux-next tree.
> >
> >>introduced a common framework for non-lru page migration and moved
> >>the compound pages check before non-lru movable pages check.
> >>
> >>So there is no need to use local variable is_lru.
> >>
> >>Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
> >
> >Other than that the patch looks ok and maybe it would be worth folding
> >into the mm-migrate-support-non-lru-movable-page-migration.patch
> 
> Agreed.

Thanks.

Hi, Andrew:

Please help to fold this patch into:
mm-migrate-support-non-lru-movable-page-migration.patch

---

^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2016-06-18  1:48 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-06-17  9:32 [PATCH] mm/compaction: remove local variable is_lru Ganesh Mahendran
2016-06-17  9:49 ` Hillf Danton
2016-06-17  9:50 ` Michal Hocko
2016-06-17 12:50   ` Vlastimil Babka
2016-06-18  1:48     ` Ganesh Mahendran

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