linux-kernel - Re: [PATCH 2/5] mm/page_alloc.c: Pull out init code from build_all

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Message-ID: <alpine.DEB.2.10.1502021624090.667@chino.kir.corp.google.com>
Date:	Mon, 2 Feb 2015 16:25:25 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vishnu Pratap Singh <vishnu.ps@...sung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mm/page_alloc.c: Pull out init code from
 build_all_zonelists

On Tue, 3 Feb 2015, Rasmus Villemoes wrote:

> Pulling the code protected by if (system_state == SYSTEM_BOOTING) into
> its own helper allows us to shrink .text a little. This relies on
> build_all_zonelists already having a __ref annotation. Add a comment
> explaining why so one doesn't have to track it down through git log.
> 

I think we should see the .text savings in the changelog to decide whether 
we want a __ref function (granted, with comment) calling an __init 
function in the source code.

> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  mm/page_alloc.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 7633c503a116..c58aa42a3387 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3945,18 +3945,29 @@ static int __build_all_zonelists(void *data)
>  	return 0;
>  }
>  
> +static noinline void __init
> +build_all_zonelists_init(void)
> +{
> +	__build_all_zonelists(NULL);
> +	mminit_verify_zonelist();
> +	cpuset_init_current_mems_allowed();
> +}
> +
>  /*
>   * Called with zonelists_mutex held always
>   * unless system_state == SYSTEM_BOOTING.
> + *
> + * __ref due to (1) call of __meminit annotated setup_zone_pageset
> + * [we're only called with non-NULL zone through __meminit paths] and
> + * (2) call of __init annotated helper build_all_zonelists_init
> + * [protected by SYSTEM_BOOTING].
>   */
>  void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone)
>  {
>  	set_zonelist_order();
>  
>  	if (system_state == SYSTEM_BOOTING) {
> -		__build_all_zonelists(NULL);
> -		mminit_verify_zonelist();
> -		cpuset_init_current_mems_allowed();
> +		build_all_zonelists_init();
>  	} else {
>  #ifdef CONFIG_MEMORY_HOTPLUG
>  		if (zone)
--
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