>>> On 16.06.23 11:21, lipeifeng@xxxxxxxx wrote:
>>> From: lipeifeng <lipeifeng@xxxxxxxx>
>>>
>>> Some of shrinkers during shrink_slab would enter synchronous-wait due
>>> to lock or other reasons, which would causes kswapd or direct_reclaim
>>> to be blocked.
>>>
>>> This patch export shrink_slab so that it can be called in drivers
>>> which can shrink memory independently.
>>>
>>> Signed-off-by: lipeifeng <lipeifeng@xxxxxxxx>
>>> ---
>>> mm/vmscan.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/mm/vmscan.c b/mm/vmscan.c index
>>> 6d0cd2840cf0..2e54fa52e7ec 100644
>>> --- a/mm/vmscan.c
>>> +++ b/mm/vmscan.c
>>> @@ -1043,7 +1043,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
>>> *
>>> * Returns the number of reclaimed slab objects.
>>> */
>>> -static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>>> +unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>>> struct mem_cgroup *memcg,
>>> int priority)
>>> {
>>> @@ -1087,6 +1087,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>>> cond_resched();
>>> return freed;
>>> }
>>> +EXPORT_SYMBOL_GPL(shrink_slab);
>>>
>>> static unsigned long drop_slab_node(int nid)
>>> {
>>
>>It feels like something we don't want arbitrary drivers to call.
>>
>>Unrelated to that, this better be sent along with actual driver usage.
>
>Hi Sir：
>
>Virtually, we have implemented async shrink_slabd isolated from kswapd and direct_reclaim.
>The goal above it is to avoid the sync-wait in kswapd or direct_reclaim due to some shrinkers.
>
>But the async shrink_slabd was only applied to mobile products so that I didn't make sure any risk in other products. For the above reasons, I wanna merge the patch to export shrink_slab and the patch of drivers would be considered to be pushed if I check all the risks.
>
>Some informal code files of driver are attached for your reference.
Hi Sir:
Pls help to review the patch merge it if no problems, thanks you very much.
-----邮件原件-----
发件人: 李培锋(wink)
发送时间: 2023年6月20日 11:05
收件人: David Hildenbrand <david@xxxxxxxxxx>; akpm@xxxxxxxxxxxxxxxxxxxx
抄送: linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; surenb@xxxxxxxxxx; gregkh@xxxxxxxxxx; zhangshiming@xxxxxxx; 郭健 <guojian@xxxxxxxx>
主题: 回复: [PATCH] mm: vmscan: export func:shrink_slab
On 16.06.23 11:21, lipeifeng@xxxxxxxx wrote:
>> From: lipeifeng <lipeifeng@xxxxxxxx>
>>
>> Some of shrinkers during shrink_slab would enter synchronous-wait due
>> to lock or other reasons, which would causes kswapd or direct_reclaim
>> to be blocked.
>>
>> This patch export shrink_slab so that it can be called in drivers
>> which can shrink memory independently.
>>
>> Signed-off-by: lipeifeng <lipeifeng@xxxxxxxx>
>> ---
>> mm/vmscan.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c index
>> 6d0cd2840cf0..2e54fa52e7ec 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -1043,7 +1043,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
>> *
>> * Returns the number of reclaimed slab objects.
>> */
>> -static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>> +unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>> struct mem_cgroup *memcg,
>> int priority)
>> {
>> @@ -1087,6 +1087,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>> cond_resched();
>> return freed;
>> }
>> +EXPORT_SYMBOL_GPL(shrink_slab);
>>
>> static unsigned long drop_slab_node(int nid)
>> {
>
>It feels like something we don't want arbitrary drivers to call.
>
>Unrelated to that, this better be sent along with actual driver usage.
Hi Sir：
Virtually, we have implemented async shrink_slabd isolated from kswapd and direct_reclaim.
The goal above it is to avoid the sync-wait in kswapd or direct_reclaim due to some shrinkers.
But the async shrink_slabd was only applied to mobile products so that I didn't make sure any risk in other products. For the above reasons, I wanna merge the patch to export shrink_slab and the patch of drivers would be considered to be pushed if I check all the risks.
Some informal code files of driver are attached for your reference.
-----邮件原件-----
发件人: David Hildenbrand <david@xxxxxxxxxx>
发送时间: 2023年6月16日 17:43
收件人: 李培锋(wink) <lipeifeng@xxxxxxxx>; akpm@xxxxxxxxxxxxxxxxxxxx
抄送: linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; surenb@xxxxxxxxxx; gregkh@xxxxxxxxxx
主题: Re: [PATCH] mm: vmscan: export func:shrink_slab
On 16.06.23 11:21, lipeifeng@xxxxxxxx wrote:
> From: lipeifeng <lipeifeng@xxxxxxxx>
>
> Some of shrinkers during shrink_slab would enter synchronous-wait due
> to lock or other reasons, which would causes kswapd or direct_reclaim
> to be blocked.
>
> This patch export shrink_slab so that it can be called in drivers
> which can shrink memory independently.
>
> Signed-off-by: lipeifeng <lipeifeng@xxxxxxxx>
> ---
> mm/vmscan.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c index
> 6d0cd2840cf0..2e54fa52e7ec 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1043,7 +1043,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
> *
> * Returns the number of reclaimed slab objects.
> */
> -static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> +unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> struct mem_cgroup *memcg,
> int priority)
> {
> @@ -1087,6 +1087,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> cond_resched();
> return freed;
> }
> +EXPORT_SYMBOL_GPL(shrink_slab);
>
> static unsigned long drop_slab_node(int nid)
> {
It feels like something we don't want arbitrary drivers to call.
Unrelated to that, this better be sent along with actual driver usage.
--
Cheers,
David / dhildenb
