linux-kernel - Re: [RFC][PATCH -mmotm 2/4] memcg: remove mem_cgroup_try

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Message-ID: <56721.10.75.179.61.1228483455.squirrel@webmail-b.css.fujitsu.com>
Date:	Fri, 5 Dec 2008 22:24:15 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Daisuke Nishimura" <nishimura@....nes.nec.co.jp>
Cc:	"LKML" <linux-kernel@...r.kernel.org>,
	"linux-mm" <linux-mm@...ck.org>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Pavel Emelyanov" <xemul@...nvz.org>,
	"Li Zefan" <lizf@...fujitsu.com>,
	"Paul Menage" <menage@...gle.com>, nishimura@....nes.nec.co.jp
Subject: Re: [RFC][PATCH -mmotm 2/4] memcg: remove mem_cgroup_try_charge

Daisuke Nishimura said:
> Now, mem_cgroup_try_charge is not used by anyone, so we can remove it.
>
> Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Not Now, but after patch [1/4] ;)
Acked-by:KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

> ---
>  include/linux/memcontrol.h |    8 --------
>  mm/memcontrol.c            |   21 +--------------------
>  2 files changed, 1 insertions(+), 28 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index fe82b58..4b35739 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -40,8 +40,6 @@ struct mm_struct;
>  extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct
> *mm,
>  				gfp_t gfp_mask);
>  /* for swap handling */
> -extern int mem_cgroup_try_charge(struct mm_struct *mm,
> -		gfp_t gfp_mask, struct mem_cgroup **ptr);
>  extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
>  		struct page *page, gfp_t mask, struct mem_cgroup **ptr);
>  extern void mem_cgroup_commit_charge_swapin(struct page *page,
> @@ -135,12 +133,6 @@ static inline int mem_cgroup_cache_charge(struct page
> *page,
>  	return 0;
>  }
>
> -static inline int mem_cgroup_try_charge(struct mm_struct *mm,
> -			gfp_t gfp_mask, struct mem_cgroup **ptr)
> -{
> -	return 0;
> -}
> -
>  static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
>  		struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
>  {
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 50ee1be..9c5856b 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -808,27 +808,8 @@ nomem:
>  	return -ENOMEM;
>  }
>
> -/**
> - * mem_cgroup_try_charge - get charge of PAGE_SIZE.
> - * @mm: an mm_struct which is charged against. (when *memcg is NULL)
> - * @gfp_mask: gfp_mask for reclaim.
> - * @memcg: a pointer to memory cgroup which is charged against.
> - *
> - * charge against memory cgroup pointed by *memcg. if *memcg == NULL,
> estimated
> - * memory cgroup from @mm is got and stored in *memcg.
> - *
> - * Returns 0 if success. -ENOMEM at failure.
> - * This call can invoke OOM-Killer.
> - */
> -
> -int mem_cgroup_try_charge(struct mm_struct *mm,
> -			  gfp_t mask, struct mem_cgroup **memcg)
> -{
> -	return __mem_cgroup_try_charge(mm, mask, memcg, true);
> -}
> -
>  /*
> - * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup
> to be
> + * commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup
> to be
>   * USED state. If already USED, uncharge and return.
>   */
>
> --
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