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From: Vlastimil Babka <vbabka@suse.cz>
To: Michal Hocko <mhocko@kernel.org>, linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	Johannes Weiner <hannes@cmpxchg.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>,
	Wen Congyang <wency@cn.fujitsu.com>
Subject: Re: [PATCH 4/9] mm, memory_hotplug: drop zone from build_all_zonelists
Date: Wed, 19 Jul 2017 15:33:32 +0200
Message-ID: <d32539e9-8ac3-7536-a205-8953d436b301@suse.cz> (raw)
In-Reply-To: <20170714080006.7250-5-mhocko@kernel.org>

On 07/14/2017 10:00 AM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
> 
> build_all_zonelists gets a zone parameter to initialize zone's
> pagesets. There is only a single user which gives a non-NULL
> zone parameter and that one doesn't really need the rest of the
> build_all_zonelists (see 6dcd73d7011b ("memory-hotplug: allocate zone's
> pcp before onlining pages")).
> 
> Therefore remove setup_zone_pageset from build_all_zonelists and call it
> from its only user directly. This will also remove a pointless zonlists
> rebuilding which is always good.
> 
> Cc: Wen Congyang <wency@cn.fujitsu.com>
> Signed-off-by: Michal Hocko <mhocko@suse.com>

Acked-by: Vlastimil Babka <vbabka@suse.cz>

with a small point below

...

> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index ebc3311555b1..00e117922b3f 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5065,7 +5065,6 @@ static void build_zonelists(pg_data_t *pgdat)
>  static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
>  static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
>  static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
> -static void setup_zone_pageset(struct zone *zone);
>  
>  /*
>   * Global mutex to protect against size modification of zonelists
> @@ -5146,19 +5145,14 @@ build_all_zonelists_init(void)
>   * unless system_state == SYSTEM_BOOTING.
>   *
>   * __ref due to (1) call of __meminit annotated setup_zone_pageset

Isn't the whole (1) in the comment invalid now?

> - * [we're only called with non-NULL zone through __meminit paths] and
> - * (2) call of __init annotated helper build_all_zonelists_init
> + * 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)
> +void __ref build_all_zonelists(pg_data_t *pgdat)
>  {
>  	if (system_state == SYSTEM_BOOTING) {
>  		build_all_zonelists_init();
>  	} else {
> -#ifdef CONFIG_MEMORY_HOTPLUG
> -		if (zone)
> -			setup_zone_pageset(zone);
> -#endif
>  		/* we have to stop all cpus to guarantee there is no user
>  		   of zonelist */
>  		stop_machine_cpuslocked(__build_all_zonelists, pgdat, NULL);
> @@ -5432,7 +5426,7 @@ static void __meminit zone_pageset_init(struct zone *zone, int cpu)
>  	pageset_set_high_and_batch(zone, pcp);
>  }
>  
> -static void __meminit setup_zone_pageset(struct zone *zone)
> +void __meminit setup_zone_pageset(struct zone *zone)
>  {
>  	int cpu;
>  	zone->pageset = alloc_percpu(struct per_cpu_pageset);
> 

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  reply index

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-14  7:59 [PATCH 0/9] cleanup zonelists initialization Michal Hocko
2017-07-14  7:59 ` [PATCH 1/9] mm, page_alloc: rip out ZONELIST_ORDER_ZONE Michal Hocko
2017-07-14  9:36   ` Mel Gorman
2017-07-14 10:47     ` Michal Hocko
2017-07-14 11:16       ` Mel Gorman
2017-07-14 11:38         ` Michal Hocko
2017-07-14 12:56           ` Mel Gorman
2017-07-14 13:01             ` Mel Gorman
2017-07-14 13:08             ` Michal Hocko
2017-07-19  9:33   ` Vlastimil Babka
2017-07-19 13:44     ` Michal Hocko
2017-07-14  7:59 ` [PATCH 2/9] mm, page_alloc: remove boot pageset initialization from memory hotplug Michal Hocko
2017-07-14  9:39   ` Mel Gorman
2017-07-19 13:15   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 3/9] mm, page_alloc: do not set_cpu_numa_mem on empty nodes initialization Michal Hocko
2017-07-14  9:48   ` Mel Gorman
2017-07-14 10:50     ` Michal Hocko
2017-07-14 12:32       ` Mel Gorman
2017-07-14 12:39         ` Michal Hocko
2017-07-14 12:56           ` Mel Gorman
2017-07-19 13:19   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 4/9] mm, memory_hotplug: drop zone from build_all_zonelists Michal Hocko
2017-07-19 13:33   ` Vlastimil Babka [this message]
2017-07-20  8:15     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 5/9] mm, memory_hotplug: remove explicit build_all_zonelists from try_online_node Michal Hocko
2017-07-14 12:14   ` Michal Hocko
2017-07-20  6:13   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 6/9] mm, page_alloc: simplify zonelist initialization Michal Hocko
2017-07-14  9:55   ` Mel Gorman
2017-07-14 10:51     ` Michal Hocko
2017-07-14 12:46   ` Mel Gorman
2017-07-14 13:02     ` Michal Hocko
2017-07-14 14:18       ` Mel Gorman
2017-07-17  6:06         ` Michal Hocko
2017-07-17  8:07           ` Mel Gorman
2017-07-17  8:19             ` Michal Hocko
2017-07-17  8:58               ` Mel Gorman
2017-07-17  9:15                 ` Michal Hocko
2017-07-20  6:55   ` Vlastimil Babka
2017-07-20  7:19     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 7/9] mm, page_alloc: remove stop_machine from build_all_zonelists Michal Hocko
2017-07-14  9:59   ` Mel Gorman
2017-07-14 11:00     ` Michal Hocko
2017-07-14 12:47       ` Mel Gorman
2017-07-14 11:29   ` Vlastimil Babka
2017-07-14 11:43     ` Michal Hocko
2017-07-14 11:45       ` Michal Hocko
2017-07-20  6:16         ` Vlastimil Babka
2017-07-20  7:24   ` Vlastimil Babka
2017-07-20  9:21     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 8/9] mm, memory_hotplug: get rid of zonelists_mutex Michal Hocko
2017-07-14  8:00 ` [PATCH 9/9] mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations Michal Hocko
2017-07-20  8:04   ` Vlastimil Babka
2017-07-21 14:39 [PATCH -v1 0/9] cleanup zonelists initialization Michal Hocko
2017-07-21 14:39 ` [PATCH 4/9] mm, memory_hotplug: drop zone from build_all_zonelists Michal Hocko

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