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

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Date:	Fri, 11 Mar 2016 09:12:13 -0800
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 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.

thanks,

greg k-h