* [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-10 4:20 ` Yisheng Xie
0 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-10 4:20 UTC (permalink / raw)
To: akpm, vbabka, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
If the migrate target is a large free page and we ignore suitable,
it may not good for defrag. So move the ignore block suitable after
check large free page.
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
mm/compaction.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 0fdfde0..4bf2a5d 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
static bool suitable_migration_target(struct compact_control *cc,
struct page *page)
{
- if (cc->ignore_block_suitable)
- return true;
-
/* If the page is a large free page, then disallow migration */
if (PageBuddy(page)) {
/*
@@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
return false;
}
+ if (cc->ignore_block_suitable)
+ return true;
+
/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
if (migrate_async_suitable(get_pageblock_migratetype(page)))
return true;
--
1.7.12.4
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-10 4:20 ` Yisheng Xie
0 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-10 4:20 UTC (permalink / raw)
To: akpm, vbabka, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
If the migrate target is a large free page and we ignore suitable,
it may not good for defrag. So move the ignore block suitable after
check large free page.
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
mm/compaction.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 0fdfde0..4bf2a5d 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
static bool suitable_migration_target(struct compact_control *cc,
struct page *page)
{
- if (cc->ignore_block_suitable)
- return true;
-
/* If the page is a large free page, then disallow migration */
if (PageBuddy(page)) {
/*
@@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
return false;
}
+ if (cc->ignore_block_suitable)
+ return true;
+
/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
if (migrate_async_suitable(get_pageblock_migratetype(page)))
return true;
--
1.7.12.4
--
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
2017-03-10 4:20 ` Yisheng Xie
@ 2017-03-10 7:30 ` Vlastimil Babka
-1 siblings, 0 replies; 10+ messages in thread
From: Vlastimil Babka @ 2017-03-10 7:30 UTC (permalink / raw)
To: Yisheng Xie, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
On 03/10/2017 05:20 AM, Yisheng Xie wrote:
> If the migrate target is a large free page and we ignore suitable,
> it may not good for defrag. So move the ignore block suitable after
> check large free page.
Right. But in practice I expect close to no impact, because direct
compaction shouldn't have to be called if there's a >=pageblock_order
page already available.
> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
> ---
> mm/compaction.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 0fdfde0..4bf2a5d 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
> static bool suitable_migration_target(struct compact_control *cc,
> struct page *page)
> {
> - if (cc->ignore_block_suitable)
> - return true;
> -
> /* If the page is a large free page, then disallow migration */
> if (PageBuddy(page)) {
> /*
> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
> return false;
> }
>
> + if (cc->ignore_block_suitable)
> + return true;
> +
> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> if (migrate_async_suitable(get_pageblock_migratetype(page)))
> return true;
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-10 7:30 ` Vlastimil Babka
0 siblings, 0 replies; 10+ messages in thread
From: Vlastimil Babka @ 2017-03-10 7:30 UTC (permalink / raw)
To: Yisheng Xie, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
On 03/10/2017 05:20 AM, Yisheng Xie wrote:
> If the migrate target is a large free page and we ignore suitable,
> it may not good for defrag. So move the ignore block suitable after
> check large free page.
Right. But in practice I expect close to no impact, because direct
compaction shouldn't have to be called if there's a >=pageblock_order
page already available.
> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
> ---
> mm/compaction.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 0fdfde0..4bf2a5d 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
> static bool suitable_migration_target(struct compact_control *cc,
> struct page *page)
> {
> - if (cc->ignore_block_suitable)
> - return true;
> -
> /* If the page is a large free page, then disallow migration */
> if (PageBuddy(page)) {
> /*
> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
> return false;
> }
>
> + if (cc->ignore_block_suitable)
> + return true;
> +
> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> if (migrate_async_suitable(get_pageblock_migratetype(page)))
> return true;
>
--
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
2017-03-10 7:30 ` Vlastimil Babka
@ 2017-03-10 9:53 ` Yisheng Xie
-1 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-10 9:53 UTC (permalink / raw)
To: Vlastimil Babka, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes,
minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
Hi Vlastimil,
Thanks for comment.
On 2017/3/10 15:30, Vlastimil Babka wrote:
> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>> If the migrate target is a large free page and we ignore suitable,
>> it may not good for defrag. So move the ignore block suitable after
>> check large free page.
>
> Right. But in practice I expect close to no impact, because direct
> compaction shouldn't have to be called if there's a >=pageblock_order
> page already available.
>
Maybe you are right and this change is just based on logical analyses.
Presently, only in direct compaction, we increase the compaction priority,
and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
we can get better perf of slow path.
Thanks
Yisheng Xie
>> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
>> ---
>> mm/compaction.c | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/mm/compaction.c b/mm/compaction.c
>> index 0fdfde0..4bf2a5d 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
>> static bool suitable_migration_target(struct compact_control *cc,
>> struct page *page)
>> {
>> - if (cc->ignore_block_suitable)
>> - return true;
>> -
>> /* If the page is a large free page, then disallow migration */
>> if (PageBuddy(page)) {
>> /*
>> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
>> return false;
>> }
>>
>> + if (cc->ignore_block_suitable)
>> + return true;
>> +
>> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
>> if (migrate_async_suitable(get_pageblock_migratetype(page)))
>> return true;
>>
>
>
> .
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-10 9:53 ` Yisheng Xie
0 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-10 9:53 UTC (permalink / raw)
To: Vlastimil Babka, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes,
minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
Hi Vlastimil,
Thanks for comment.
On 2017/3/10 15:30, Vlastimil Babka wrote:
> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>> If the migrate target is a large free page and we ignore suitable,
>> it may not good for defrag. So move the ignore block suitable after
>> check large free page.
>
> Right. But in practice I expect close to no impact, because direct
> compaction shouldn't have to be called if there's a >=pageblock_order
> page already available.
>
Maybe you are right and this change is just based on logical analyses.
Presently, only in direct compaction, we increase the compaction priority,
and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
we can get better perf of slow path.
Thanks
Yisheng Xie
>> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
>> ---
>> mm/compaction.c | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/mm/compaction.c b/mm/compaction.c
>> index 0fdfde0..4bf2a5d 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
>> static bool suitable_migration_target(struct compact_control *cc,
>> struct page *page)
>> {
>> - if (cc->ignore_block_suitable)
>> - return true;
>> -
>> /* If the page is a large free page, then disallow migration */
>> if (PageBuddy(page)) {
>> /*
>> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
>> return false;
>> }
>>
>> + if (cc->ignore_block_suitable)
>> + return true;
>> +
>> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
>> if (migrate_async_suitable(get_pageblock_migratetype(page)))
>> return true;
>>
>
>
> .
>
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
2017-03-10 9:53 ` Yisheng Xie
@ 2017-03-13 9:51 ` Vlastimil Babka
-1 siblings, 0 replies; 10+ messages in thread
From: Vlastimil Babka @ 2017-03-13 9:51 UTC (permalink / raw)
To: Yisheng Xie, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
On 03/10/2017 10:53 AM, Yisheng Xie wrote:
> Hi Vlastimil,
>
> Thanks for comment.
> On 2017/3/10 15:30, Vlastimil Babka wrote:
>> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>>> If the migrate target is a large free page and we ignore suitable,
>>> it may not good for defrag. So move the ignore block suitable after
>>> check large free page.
>>
>> Right. But in practice I expect close to no impact, because direct
>> compaction shouldn't have to be called if there's a >=pageblock_order
>> page already available.
>>
> Maybe you are right and this change is just based on logical analyses.
I'm not opposing the change, it might be better for future-proofing the
function, just pointing out that it most likely won't have any visible
effect right now.
> Presently, only in direct compaction, we increase the compaction priority,
> and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
> we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
> we can get better perf of slow path.
That would need a very good evaluation at the very least. Migrating
pages into pageblocks other than movable ones brings the danger of later
unmovable/reclaimable allocations having to fallback to movable
pageblocks and causing permanent fragmentation. For direct compaction we
decided that it's better to risk permanent fragmentation than a
premature OOM, but for kcompactd there doesn't seem to be such
compelling reason.
> Thanks
> Yisheng Xie
>
>>> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
>>> ---
>>> mm/compaction.c | 6 +++---
>>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/mm/compaction.c b/mm/compaction.c
>>> index 0fdfde0..4bf2a5d 100644
>>> --- a/mm/compaction.c
>>> +++ b/mm/compaction.c
>>> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
>>> static bool suitable_migration_target(struct compact_control *cc,
>>> struct page *page)
>>> {
>>> - if (cc->ignore_block_suitable)
>>> - return true;
>>> -
>>> /* If the page is a large free page, then disallow migration */
>>> if (PageBuddy(page)) {
>>> /*
>>> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
>>> return false;
>>> }
>>>
>>> + if (cc->ignore_block_suitable)
>>> + return true;
>>> +
>>> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
>>> if (migrate_async_suitable(get_pageblock_migratetype(page)))
>>> return true;
>>>
>>
>>
>> .
>>
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-13 9:51 ` Vlastimil Babka
0 siblings, 0 replies; 10+ messages in thread
From: Vlastimil Babka @ 2017-03-13 9:51 UTC (permalink / raw)
To: Yisheng Xie, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes, minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
On 03/10/2017 10:53 AM, Yisheng Xie wrote:
> Hi Vlastimil,
>
> Thanks for comment.
> On 2017/3/10 15:30, Vlastimil Babka wrote:
>> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>>> If the migrate target is a large free page and we ignore suitable,
>>> it may not good for defrag. So move the ignore block suitable after
>>> check large free page.
>>
>> Right. But in practice I expect close to no impact, because direct
>> compaction shouldn't have to be called if there's a >=pageblock_order
>> page already available.
>>
> Maybe you are right and this change is just based on logical analyses.
I'm not opposing the change, it might be better for future-proofing the
function, just pointing out that it most likely won't have any visible
effect right now.
> Presently, only in direct compaction, we increase the compaction priority,
> and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
> we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
> we can get better perf of slow path.
That would need a very good evaluation at the very least. Migrating
pages into pageblocks other than movable ones brings the danger of later
unmovable/reclaimable allocations having to fallback to movable
pageblocks and causing permanent fragmentation. For direct compaction we
decided that it's better to risk permanent fragmentation than a
premature OOM, but for kcompactd there doesn't seem to be such
compelling reason.
> Thanks
> Yisheng Xie
>
>>> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
>>> ---
>>> mm/compaction.c | 6 +++---
>>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/mm/compaction.c b/mm/compaction.c
>>> index 0fdfde0..4bf2a5d 100644
>>> --- a/mm/compaction.c
>>> +++ b/mm/compaction.c
>>> @@ -991,9 +991,6 @@ static bool too_many_isolated(struct zone *zone)
>>> static bool suitable_migration_target(struct compact_control *cc,
>>> struct page *page)
>>> {
>>> - if (cc->ignore_block_suitable)
>>> - return true;
>>> -
>>> /* If the page is a large free page, then disallow migration */
>>> if (PageBuddy(page)) {
>>> /*
>>> @@ -1005,6 +1002,9 @@ static bool suitable_migration_target(struct compact_control *cc,
>>> return false;
>>> }
>>>
>>> + if (cc->ignore_block_suitable)
>>> + return true;
>>> +
>>> /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
>>> if (migrate_async_suitable(get_pageblock_migratetype(page)))
>>> return true;
>>>
>>
>>
>> .
>>
>
--
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
2017-03-13 9:51 ` Vlastimil Babka
@ 2017-03-13 12:16 ` Yisheng Xie
-1 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-13 12:16 UTC (permalink / raw)
To: Vlastimil Babka, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes,
minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
Hi Vlastimil,
Thanks for comment.
On 2017/3/13 17:51, Vlastimil Babka wrote:
> On 03/10/2017 10:53 AM, Yisheng Xie wrote:
>> Hi Vlastimil,
>>
>> Thanks for comment.
>> On 2017/3/10 15:30, Vlastimil Babka wrote:
>>> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>>>> If the migrate target is a large free page and we ignore suitable,
>>>> it may not good for defrag. So move the ignore block suitable after
>>>> check large free page.
>>>
>>> Right. But in practice I expect close to no impact, because direct
>>> compaction shouldn't have to be called if there's a >=pageblock_order
>>> page already available.
>>>
>> Maybe you are right and this change is just based on logical analyses.
>
> I'm not opposing the change, it might be better for future-proofing the
> function, just pointing out that it most likely won't have any visible
> effect right now.
Get it, maybe I should put these in the change log :)
>
>> Presently, only in direct compaction, we increase the compaction priority,
>> and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
>> we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
>> we can get better perf of slow path.
>
> That would need a very good evaluation at the very least. Migrating
> pages into pageblocks other than movable ones brings the danger of later
> unmovable/reclaimable allocations having to fallback to movable
> pageblocks and causing permanent fragmentation. For direct compaction we
> decided that it's better to risk permanent fragmentation than a
> premature OOM, but for kcompactd there doesn't seem to be such
> compelling reason.
Thanks for kindly explain.
>
>> Thanks
>> Yisheng Xie
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RFC] mm/compaction: ignore block suitable after check large free page
@ 2017-03-13 12:16 ` Yisheng Xie
0 siblings, 0 replies; 10+ messages in thread
From: Yisheng Xie @ 2017-03-13 12:16 UTC (permalink / raw)
To: Vlastimil Babka, akpm, mhocko, mgorman, iamjoonsoo.kim, rientjes,
minchan
Cc: linux-mm, linux-kernel, guohanjun, qiuxishi, liubo95
Hi Vlastimil,
Thanks for comment.
On 2017/3/13 17:51, Vlastimil Babka wrote:
> On 03/10/2017 10:53 AM, Yisheng Xie wrote:
>> Hi Vlastimil,
>>
>> Thanks for comment.
>> On 2017/3/10 15:30, Vlastimil Babka wrote:
>>> On 03/10/2017 05:20 AM, Yisheng Xie wrote:
>>>> If the migrate target is a large free page and we ignore suitable,
>>>> it may not good for defrag. So move the ignore block suitable after
>>>> check large free page.
>>>
>>> Right. But in practice I expect close to no impact, because direct
>>> compaction shouldn't have to be called if there's a >=pageblock_order
>>> page already available.
>>>
>> Maybe you are right and this change is just based on logical analyses.
>
> I'm not opposing the change, it might be better for future-proofing the
> function, just pointing out that it most likely won't have any visible
> effect right now.
Get it, maybe I should put these in the change log :)
>
>> Presently, only in direct compaction, we increase the compaction priority,
>> and ignore suitable at MIN_COMPACT_PRIORITY. I have a silly question, can
>> we do the similar thing in kcompactd? maybe by doing most work in kcompactd,
>> we can get better perf of slow path.
>
> That would need a very good evaluation at the very least. Migrating
> pages into pageblocks other than movable ones brings the danger of later
> unmovable/reclaimable allocations having to fallback to movable
> pageblocks and causing permanent fragmentation. For direct compaction we
> decided that it's better to risk permanent fragmentation than a
> premature OOM, but for kcompactd there doesn't seem to be such
> compelling reason.
Thanks for kindly explain.
>
>> Thanks
>> Yisheng Xie
--
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/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2017-03-13 12:17 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-10 4:20 [RFC] mm/compaction: ignore block suitable after check large free page Yisheng Xie
2017-03-10 4:20 ` Yisheng Xie
2017-03-10 7:30 ` Vlastimil Babka
2017-03-10 7:30 ` Vlastimil Babka
2017-03-10 9:53 ` Yisheng Xie
2017-03-10 9:53 ` Yisheng Xie
2017-03-13 9:51 ` Vlastimil Babka
2017-03-13 9:51 ` Vlastimil Babka
2017-03-13 12:16 ` Yisheng Xie
2017-03-13 12:16 ` Yisheng Xie
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