linux-kernel - Re: [PATCH 06/11] memcg: make inactive_anon_is

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Date:	Thu,  4 Dec 2008 15:14:20 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH 06/11] memcg: make inactive_anon_is_low()

> > +/*
> > + * The inactive anon list should be small enough that the VM never has to
> > + * do too much work, but large enough that each inactive page has a chance
> > + * to be referenced again before it is swapped out.
> > + *
> > + * this calculation is straightforward porting from
> > + * page_alloc.c::setup_per_zone_inactive_ratio().
> > + * it describe more detail.
> > + */
> > +static void mem_cgroup_set_inactive_ratio(struct mem_cgroup *memcg)
> > +{
> > +	unsigned int gb, ratio;
> > +
> > +	gb = res_counter_read_u64(&memcg->res, RES_LIMIT) >> 30;
> > +	if (gb)
> > +		ratio = int_sqrt(10 * gb);
> 
> I don't understand where the magic number 10 comes from?

the function comment write to

  this calculation is straightforward porting from
  page_alloc.c::setup_per_zone_inactive_ratio().
  it describe more detail.





> > @@ -1400,7 +1412,7 @@ static unsigned long shrink_list(enum lr
> >  	}
> > 
> >  	if (lru == LRU_ACTIVE_ANON &&
> > -	    (!scan_global_lru(sc) || inactive_anon_is_low(zone))) {
> > +	    inactive_anon_is_low(zone, sc)) {
> 
> Can't we merge the line with the "if" statement

Will fix.

thanks.



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