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From: Vlastimil Babka <vbabka@suse.cz>
To: Mel Gorman <mgorman@techsingularity.net>,
	Linux-MM <linux-mm@kvack.org>,
	Linux-RT-Users <linux-rt-users@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Chuck Lever <chuck.lever@oracle.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>, Michal Hocko <mhocko@kernel.org>,
	Oscar Salvador <osalvador@suse.de>
Subject: Re: [PATCH 01/11] mm/page_alloc: Split per cpu page lists and zone stats
Date: Mon, 12 Apr 2021 19:43:18 +0200
Message-ID: <81cf880c-826e-6bbf-3af0-22d7aa2d3075@suse.cz> (raw)
In-Reply-To: <20210407202423.16022-2-mgorman@techsingularity.net>

On 4/7/21 10:24 PM, Mel Gorman wrote:
> @@ -6691,7 +6697,7 @@ static __meminit void zone_pcp_init(struct zone *zone)
>  	 * relies on the ability of the linker to provide the
>  	 * offset of a (static) per cpu variable into the per cpu area.
>  	 */
> -	zone->pageset = &boot_pageset;
> +	zone->per_cpu_pageset = &boot_pageset;

I don't see any &boot_zonestats assignment here in zone_pcp_init() or its
caller(s), which seems strange, as zone_pcp_reset() does it.

>  	zone->pageset_high = BOOT_PAGESET_HIGH;
>  	zone->pageset_batch = BOOT_PAGESET_BATCH;
>  
> @@ -8954,17 +8960,19 @@ void zone_pcp_reset(struct zone *zone)
>  {
>  	unsigned long flags;
>  	int cpu;
> -	struct per_cpu_pageset *pset;
> +	struct per_cpu_zonestat *pzstats;
>  
>  	/* avoid races with drain_pages()  */
>  	local_irq_save(flags);
> -	if (zone->pageset != &boot_pageset) {
> +	if (zone->per_cpu_pageset != &boot_pageset) {
>  		for_each_online_cpu(cpu) {
> -			pset = per_cpu_ptr(zone->pageset, cpu);
> -			drain_zonestat(zone, pset);
> +			pzstats = per_cpu_ptr(zone->per_cpu_zonestats, cpu);
> +			drain_zonestat(zone, pzstats);
>  		}
> -		free_percpu(zone->pageset);
> -		zone->pageset = &boot_pageset;
> +		free_percpu(zone->per_cpu_pageset);
> +		free_percpu(zone->per_cpu_zonestats);
> +		zone->per_cpu_pageset = &boot_pageset;
> +		zone->per_cpu_zonestats = &boot_zonestats;

^ here

>  	}
>  	local_irq_restore(flags);
>  }

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 20:24 [PATCH 0/11 v2] Use local_lock for pcp protection and reduce stat overhead Mel Gorman
2021-04-07 20:24 ` [PATCH 01/11] mm/page_alloc: Split per cpu page lists and zone stats Mel Gorman
2021-04-12 17:43   ` Vlastimil Babka [this message]
2021-04-13 13:27     ` Mel Gorman
2021-04-07 20:24 ` [PATCH 02/11] mm/page_alloc: Convert per-cpu list protection to local_lock Mel Gorman
2021-04-08 10:52   ` Peter Zijlstra
2021-04-08 17:42     ` Mel Gorman
2021-04-09  6:39       ` Peter Zijlstra
2021-04-09  7:59         ` Mel Gorman
2021-04-09  8:24           ` Peter Zijlstra
2021-04-09 13:32             ` Mel Gorman
2021-04-09 18:55               ` Peter Zijlstra
2021-04-12 11:56                 ` Mel Gorman
2021-04-12 21:47                   ` Thomas Gleixner
2021-04-13 16:52                     ` Mel Gorman
2021-04-07 20:24 ` [PATCH 03/11] mm/memory_hotplug: Make unpopulated zones PCP structures unreachable during hot remove Mel Gorman
2021-04-07 20:24 ` [PATCH 04/11] mm/vmstat: Convert NUMA statistics to basic NUMA counters Mel Gorman
2021-04-14 12:56   ` Vlastimil Babka
2021-04-14 15:18     ` Mel Gorman
2021-04-14 15:56       ` Vlastimil Babka
2021-04-15 10:06         ` Mel Gorman
2021-04-07 20:24 ` [PATCH 05/11] mm/vmstat: Inline NUMA event counter updates Mel Gorman
2021-04-07 20:24 ` [PATCH 06/11] mm/page_alloc: Batch the accounting updates in the bulk allocator Mel Gorman
2021-04-07 20:24 ` [PATCH 07/11] mm/page_alloc: Reduce duration that IRQs are disabled for VM counters Mel Gorman
2021-04-07 20:24 ` [PATCH 08/11] mm/page_alloc: Remove duplicate checks if migratetype should be isolated Mel Gorman
2021-04-07 20:24 ` [PATCH 09/11] mm/page_alloc: Explicitly acquire the zone lock in __free_pages_ok Mel Gorman
2021-04-07 20:24 ` [PATCH 10/11] mm/page_alloc: Avoid conflating IRQs disabled with zone->lock Mel Gorman
2021-04-07 20:24 ` [PATCH 11/11] mm/page_alloc: Update PGFREE outside the zone lock in __free_pages_ok Mel Gorman
2021-04-08 10:56 ` [PATCH 0/11 v2] Use local_lock for pcp protection and reduce stat overhead Peter Zijlstra
2021-04-08 17:48   ` Mel Gorman
2021-04-14 13:39 [PATCH 0/11 v3] " Mel Gorman
2021-04-14 13:39 ` [PATCH 01/11] mm/page_alloc: Split per cpu page lists and zone stats Mel Gorman

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