[PATCH 0/2] Two minor cleanups for compaction

[PATCH 0/2] Two minor cleanups for compaction

[Kemeng Shi]

Hi all, this series contains two random cleanups for compaction.
Patch 1 correct wrong comment in fast_isolate_freepages.
Patch 2 avoid to call unneeded pageblock_end_pfn when no_set_skip_hint
is set.
Thanks!

Kemeng Shi (2):
  mm/compaction: correct comment of candidate pfn in
    fast_isolate_freepages
  mm/compaction: avoid unneeded pageblock_end_pfn when no_set_skip_hint
    is set

 mm/compaction.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.30.0

Re: [PATCH 0/2] Two minor cleanups for compaction

[Baolin Wang]

On 7/20/2023 7:53 PM, Kemeng Shi wrote:
> Hi all, this series contains two random cleanups for compaction.
> Patch 1 correct wrong comment in fast_isolate_freepages.
> Patch 2 avoid to call unneeded pageblock_end_pfn when no_set_skip_hint
> is set.
> Thanks!

I only received the patch 2 in this patch set, and I checked the lore
archives[1], still did not find patch 1. You missed patch 1?

[1] 
https://lore.kernel.org/linux-mm/20230720115351.2039431-1-shikemeng@huaweicloud.com/

> 
> Kemeng Shi (2):
>    mm/compaction: correct comment of candidate pfn in
>      fast_isolate_freepages
>    mm/compaction: avoid unneeded pageblock_end_pfn when no_set_skip_hint
>      is set
> 
>   mm/compaction.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 

Re: [PATCH 0/2] Two minor cleanups for compaction

[Kemeng Shi]

on 7/20/2023 2:08 PM, Baolin Wang wrote:
> 
> 
> On 7/20/2023 7:53 PM, Kemeng Shi wrote:
>> Hi all, this series contains two random cleanups for compaction.
>> Patch 1 correct wrong comment in fast_isolate_freepages.
>> Patch 2 avoid to call unneeded pageblock_end_pfn when no_set_skip_hint
>> is set.
>> Thanks!
> 
> I only received the patch 2 in this patch set, and I checked the lore
> archives[1], still did not find patch 1. You missed patch 1?
> 
> [1] https://lore.kernel.org/linux-mm/20230720115351.2039431-1-shikemeng@huaweicloud.com/
> 
>>
>> Kemeng Shi (2):
>>    mm/compaction: correct comment of candidate pfn in
>>      fast_isolate_freepages
>>    mm/compaction: avoid unneeded pageblock_end_pfn when no_set_skip_hint
>>      is set
>>
>>   mm/compaction.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
> 
> 
Hi Baolin, thanks for the review and for reminding me of this. I can recive the patch 1
in my mail client. There maybe some problem in my mail server. I also found there is
a whole patchset I have sent is missing in lcore archives. I will try to resend these
patches. Thanks a lot.

-- 
Best wishes
Kemeng Shi

[PATCH 1/2] mm/compaction: correct comment of candidate pfn in fast_isolate_freepages

[Kemeng Shi]

If no preferred one was not found, we will use candidate page with maximum
pfn > min_pfn which is saved in high_pfn. Correct "minimum" to "maximum
candidate" in comment.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 mm/compaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index eb1d3d9a422c..c0d8d08fc163 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1526,7 +1526,7 @@ static void fast_isolate_freepages(struct compact_control *cc)
 				break;
 		}
 
-		/* Use a minimum pfn if a preferred one was not found */
+		/* Use a maximum candidate pfn if a preferred one was not found */
 		if (!page && high_pfn) {
 			page = pfn_to_page(high_pfn);
 
-- 
2.30.0

Re: [PATCH 1/2] mm/compaction: correct comment of candidate pfn in fast_isolate_freepages

[Kemeng Shi]

Hi Baolin, I try to resend a new v2 patchset, the patch 1 is still
missing. Here is the patch 1 in old version and I find it in lore
archive of lore.kernel.org with link [1].
It's likely that patch 1 is denied by linux-mm.kvack.org but accepted
by linux-kernel@vger.kernel.org. Is anyone know how to submit issue of
linux-mm.kvack.org, please let know. Thanks!

[1] https://lore.kernel.org/all/20230720115351.2039431-2-shikemeng@huaweicloud.com/

on 7/20/2023 7:53 PM, Kemeng Shi wrote:
> If no preferred one was not found, we will use candidate page with maximum
> pfn > min_pfn which is saved in high_pfn. Correct "minimum" to "maximum
> candidate" in comment.
> 
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
> ---
>  mm/compaction.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index eb1d3d9a422c..c0d8d08fc163 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1526,7 +1526,7 @@ static void fast_isolate_freepages(struct compact_control *cc)
>  				break;
>  		}
>  
> -		/* Use a minimum pfn if a preferred one was not found */
> +		/* Use a maximum candidate pfn if a preferred one was not found */
>  		if (!page && high_pfn) {
>  			page = pfn_to_page(high_pfn);
>  
> 

-- 
Best wishes
Kemeng Shi

[PATCH 1/2] mm/compaction: correct comment of candidate pfn in fast_isolate_freepages

[Kemeng Shi]

If no preferred one was not found, we will use candidate page with maximum
pfn > min_pfn which is saved in high_pfn. Correct "minimum" to "maximum
candidate" in comment.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 mm/compaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index eb1d3d9a422c..c0d8d08fc163 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1526,7 +1526,7 @@ static void fast_isolate_freepages(struct compact_control *cc)
 				break;
 		}
 
-		/* Use a minimum pfn if a preferred one was not found */
+		/* Use a maximum candidate pfn if a preferred one was not found */
 		if (!page && high_pfn) {
 			page = pfn_to_page(high_pfn);
 
-- 
2.30.0

[PATCH 2/2] mm/compaction: avoid unneeded pageblock_end_pfn when no_set_skip_hint is set

[Kemeng Shi]

Move pageblock_end_pfn after no_set_skip_hint check to avoid unneeded
pageblock_end_pfn if no_set_skip_hint is set.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 mm/compaction.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index c0d8d08fc163..9b7a0a69e19f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -458,12 +458,12 @@ static void update_cached_migrate(struct compact_control *cc, unsigned long pfn)
 {
 	struct zone *zone = cc->zone;
 
-	pfn = pageblock_end_pfn(pfn);
-
 	/* Set for isolation rather than compaction */
 	if (cc->no_set_skip_hint)
 		return;
 
+	pfn = pageblock_end_pfn(pfn);
+
 	if (pfn > zone->compact_cached_migrate_pfn[0])
 		zone->compact_cached_migrate_pfn[0] = pfn;
 	if (cc->mode != MIGRATE_ASYNC &&
-- 
2.30.0

Re: [PATCH 2/2] mm/compaction: avoid unneeded pageblock_end_pfn when no_set_skip_hint is set

[Baolin Wang]

On 7/20/2023 7:53 PM, Kemeng Shi wrote:
> Move pageblock_end_pfn after no_set_skip_hint check to avoid unneeded
> pageblock_end_pfn if no_set_skip_hint is set.
> 
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>

Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>

> ---
>   mm/compaction.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index c0d8d08fc163..9b7a0a69e19f 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -458,12 +458,12 @@ static void update_cached_migrate(struct compact_control *cc, unsigned long pfn)
>   {
>   	struct zone *zone = cc->zone;
>   
> -	pfn = pageblock_end_pfn(pfn);
> -
>   	/* Set for isolation rather than compaction */
>   	if (cc->no_set_skip_hint)
>   		return;
>   
> +	pfn = pageblock_end_pfn(pfn);
> +
>   	if (pfn > zone->compact_cached_migrate_pfn[0])
>   		zone->compact_cached_migrate_pfn[0] = pfn;
>   	if (cc->mode != MIGRATE_ASYNC &&