linux-kernel - Re: [patch] mm: memcontrol: fold move_anon() and move

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Message-ID: <20150114154210.GG4706@dhcp22.suse.cz>
Date:	Wed, 14 Jan 2015 16:42:10 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] mm: memcontrol: fold move_anon() and move_file()

On Tue 13-01-15 13:59:52, Johannes Weiner wrote:
> Turn the move type enum into flags and give the flags field a shorter
> name.  Once that is done, move_anon() and move_file() are simple
> enough to just fold them into the callsites.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Michal Hocko <mhocko@...e.cz>

one nit below

> ---
>  mm/memcontrol.c | 49 ++++++++++++++++++-------------------------------
>  1 file changed, 18 insertions(+), 31 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 5a5769e8b12c..692e96407627 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -360,21 +360,18 @@ static bool memcg_kmem_is_active(struct mem_cgroup *memcg)
>  
>  /* Stuffs for move charges at task migration. */
>  /*
> - * Types of charges to be moved. "move_charge_at_immitgrate" and
> - * "immigrate_flags" are treated as a left-shifted bitmap of these types.
> + * Types of charges to be moved.
>   */
> -enum move_type {
> -	MOVE_CHARGE_TYPE_ANON,	/* private anonymous page and swap of it */
> -	MOVE_CHARGE_TYPE_FILE,	/* file page(including tmpfs) and swap of it */
> -	NR_MOVE_TYPE,
> -};
> +#define MOVE_ANON	0x1U
> +#define MOVE_FILE	0x2U
> +#define MOVE_MASK	0x3U

#define MOVE_MASK	(MOVE_ANON | MOVE_FILE)

would be probably better
[...]
-- 
Michal Hocko
SUSE Labs
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