linux-kernel - Re: [PATCH] android: lmk: add swap pte pmd in tasksize

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Date:	Wed, 30 Mar 2016 18:26:00 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Chen Feng <puck.chen@...ilicon.com>
Cc:	yalin wang <yalin.wang2010@...il.com>,
	Lu Bing <albert.lubing@...ilicon.com>,
	devel@...verdev.osuosl.org, dan.zhao@...ilicon.com,
	chenxiang9@...wei.com, xuyiping@...ilicon.com,
	suzhuangluan@...ilicon.com, linuxarm@...wei.com,
	riandrews@...roid.com, alan.wei@...ilicon.com,
	linux-kernel@...r.kernel.org, arve@...roid.com,
	saberlily.xia@...ilicon.com, shimingxing@...ilicon.com,
	oliver.fu@...ilicon.com, liuzixing@...wei.com,
	yudongbin@...ilicon.com, kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH] android: lmk: add swap pte pmd in tasksize

On Mon, Mar 14, 2016 at 09:26:00AM +0800, Chen Feng wrote:
> Hi greg,
> 
> On 2016/3/12 1:12, Greg KH wrote:
> > On Fri, Mar 11, 2016 at 05:05:45PM +0800, Chen Feng wrote:
> >>
> >>
> >> On 2016/3/11 15:30, yalin wang wrote:
> >>>
> >>>> On Mar 11, 2016, at 15:23, Lu Bing <albert.lubing@...ilicon.com> wrote:
> >>>>
> >>>> From: l00215322 <albert.lubing@...ilicon.com>
> >>>>
> >>>> Many android devices have zram,so we should add "MM_SWAPENTS" in tasksize.
> >>>> Refer oom_kill.c,we add pte&pmd also.
> >>>>
> >>>> Reviewed-by: Chen Feng <puck.chen@...ilicon.com>
> >>>> Reviewed-by: Fu Jun <oliver.fu@...ilicon.com>
> >>>> Reviewed-by: Xu YiPing <xuyiping@...ilicon.com>
> >>>> Reviewed-by: Yu DongBin <yudongbin@...ilicon.com>
> >>>> Signed-off-by: Lu Bing <albert.lubing@...ilicon.com>
> >>>> ---
> >>>> drivers/staging/android/lowmemorykiller.c | 4 +++-
> >>>> 1 file changed, 3 insertions(+), 1 deletion(-)
> >>>>
> >>>> diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
> >>>> index 8b5a4a8..0817d3b 100644
> >>>> --- a/drivers/staging/android/lowmemorykiller.c
> >>>> +++ b/drivers/staging/android/lowmemorykiller.c
> >>>> @@ -139,7 +139,9 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
> >>>> 			task_unlock(p);
> >>>> 			continue;
> >>>> 		}
> >>>> -		tasksize = get_mm_rss(p->mm);
> >>>> +		tasksize = get_mm_rss(p->mm) +
> >>>> +			get_mm_counter(p->mm, MM_SWAPENTS) +
> >>>> +			atomic_long_read(&p->mm->nr_ptes) + mm_nr_pmds(p->mm);
> >>> why not introduce a mm_nr_ptes()  help function here ?
> >>> more clear to see .
> >>>
> >> Since the code is in staging, we can add another patch to do this.
> > 
> > I do not understand this, please explain.
> > 
> I mean that we can submit another patch to add mm_nr_ptes() in mm-module and replace the code used nr_ptes
> with this interface(mm_nr_ptes()).
> 
> This patch is just change the score of task-size in low memory killer.

Ok, I'll drop this from my queue.