答复: 答复: [PATCH v3] mm/compaction:let proactive compaction order configurable

[Chu,Kaiping]

-----邮件原件-----
发件人: Rafael Aquini <aquini@xxxxxxxxxx> 
发送时间: 2021年4月30日 3:46
收件人: Chu,Kaiping <chukaiping@xxxxxxxxx>
抄送: mcgrof@xxxxxxxxxx; keescook@xxxxxxxxxxxx; yzaikin@xxxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; vbabka@xxxxxxx; nigupta@xxxxxxxxxx; bhe@xxxxxxxxxx; khalid.aziz@xxxxxxxxxx; iamjoonsoo.kim@xxxxxxx; mateusznosek0@xxxxxxxxx; sh_def@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx
主题: Re: 答复: [PATCH v3] mm/compaction:let proactive compaction order configurable

On Wed, Apr 28, 2021 at 01:17:40AM +0000, Chu,Kaiping wrote:
> Please see my answer inline.
> 
> -----邮件原件-----
> 发件人: Rafael Aquini <aquini@xxxxxxxxxx>
> 发送时间: 2021年4月26日 9:31
> 收件人: Chu,Kaiping <chukaiping@xxxxxxxxx>
> 抄送: mcgrof@xxxxxxxxxx; keescook@xxxxxxxxxxxx; yzaikin@xxxxxxxxxx; 
> akpm@xxxxxxxxxxxxxxxxxxxx; vbabka@xxxxxxx; nigupta@xxxxxxxxxx; 
> bhe@xxxxxxxxxx; khalid.aziz@xxxxxxxxxx; iamjoonsoo.kim@xxxxxxx; 
> mateusznosek0@xxxxxxxxx; sh_def@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; 
> linux-fsdevel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx
> 主题: Re: [PATCH v3] mm/compaction:let proactive compaction order 
> configurable
> 
> On Sun, Apr 25, 2021 at 09:21:02AM +0800, chukaiping wrote:
> > Currently the proactive compaction order is fixed to 
> > COMPACTION_HPAGE_ORDER(9), it's OK in most machines with lots of 
> > normal 4KB memory, but it's too high for the machines with small 
> > normal memory, for example the machines with most memory configured 
> > as 1GB hugetlbfs huge pages. In these machines the max order of free 
> > pages is often below 9, and it's always below 9 even with hard 
> > compaction. This will lead to proactive compaction be triggered very 
> > frequently. In these machines we only care about order of 3 or 4.
> > This patch export the oder to proc and let it configurable by user, 
> > and the default value is still COMPACTION_HPAGE_ORDER.
> > 
> > Signed-off-by: chukaiping <chukaiping@xxxxxxxxx>
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> 
> Two minor nits on the commit log message: 
> * there seems to be a whitespage missing in your short log: 
>   "... mm/compaction:let ..."
> --> I will fix it in next patch.
> 
> * has the path really been reported by a test robot?
> --> Yes. There is a compile error in v1, I fixed it in v2.
>

> So, no... the test robot should not be listed as Reported-by. 
I did it as below suggestion in the build error notification email sent by kernel test robot.
" If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>"