linux-kernel - Re: [PATCH RFC v2 4/4] memcg: implement memory thresholds

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Date:	Sat, 12 Dec 2009 15:11:33 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	nishimura@....nes.nec.co.jp
Cc:	containers@...ts.linux-foundation.org, linux-mm@...ck.org,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Dan Malek <dan@...eddedalley.com>,
	Vladislav Buzov <vbuzov@...eddedalley.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 4/4] memcg: implement memory thresholds

On Sat, Dec 12, 2009 at 5:19 AM, Daisuke Nishimura
<d-nishimura@....biglobe.ne.jp> wrote:
>> @@ -56,6 +61,7 @@ static int really_do_swap_account __initdata = 1; /* for remember boot option*/
>>
>>  static DEFINE_MUTEX(memcg_tasklist); /* can be hold under cgroup_mutex */
> This mutex has already removed in current mmotm.
> Please write a patch for memcg based on mmot.

Ok.

>
>>  #define SOFTLIMIT_EVENTS_THRESH (1000)
>> +#define THRESHOLDS_EVENTS_THRESH (100)
>>
>>  /*
>>   * Statistics for memory cgroup.
>
> (snip)
>
>> @@ -1363,6 +1395,11 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
>>       if (mem_cgroup_soft_limit_check(mem))
>>               mem_cgroup_update_tree(mem, page);
>>  done:
>> +     if (mem_cgroup_threshold_check(mem)) {
>> +             mem_cgroup_threshold(mem, false);
>> +             if (do_swap_account)
>> +                     mem_cgroup_threshold(mem, true);
>> +     }
>>       return 0;
>>  nomem:
>>       css_put(&mem->css);
>> @@ -1906,6 +1943,11 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
>>
>>       if (mem_cgroup_soft_limit_check(mem))
>>               mem_cgroup_update_tree(mem, page);
>> +     if (mem_cgroup_threshold_check(mem)) {
>> +             mem_cgroup_threshold(mem, false);
>> +             if (do_swap_account)
>> +                     mem_cgroup_threshold(mem, true);
>> +     }
>>       /* at swapout, this memcg will be accessed to record to swap */
>>       if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
>>               css_put(&mem->css);
> Can "if (do_swap_account)" check be moved into mem_cgroup_threshold ?

Ok, I'll move it. It will affect performance of
mem_cgroup_invalidate_thresholds(),
but I don't think that it's important.
--
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