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From: Vlastimil Babka <vbabka@suse.cz>
To: Mel Gorman <mgorman@techsingularity.net>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: Chuck Lever <chuck.lever@oracle.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>, Michal Hocko <mhocko@kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	Linux-RT-Users <linux-rt-users@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/9] mm/page_alloc: Split per cpu page lists and zone stats
Date: Thu, 22 Apr 2021 14:19:53 +0200	[thread overview]
Message-ID: <45156f57-2fa9-71c8-aea5-d06d457c0236@suse.cz> (raw)
In-Reply-To: <20210422111441.24318-2-mgorman@techsingularity.net>

On 4/22/21 1:14 PM, Mel Gorman wrote:
> The per-cpu page allocator lists and the per-cpu vmstat deltas are stored
> in the same struct per_cpu_pages even though vmstats have no direct impact
> on the per-cpu page lists. This is inconsistent because the vmstats for a
> node are stored on a dedicated structure. The bigger issue is that the
> per_cpu_pages structure is not cache-aligned and stat updates either
> cache conflict with adjacent per-cpu lists incurring a runtime cost or
> padding is required incurring a memory cost.
> 
> This patch splits the per-cpu pagelists and the vmstat deltas into separate
> structures. It's mostly a mechanical conversion but some variable renaming
> is done to clearly distinguish the per-cpu pages structure (pcp) from
> the vmstats (pzstats).
> 
> Superficially, this appears to increase the size of the per_cpu_pages
> structure but the movement of expire fills a structure hole so there is
> no impact overall.
> 
> [lkp@intel.com: Check struct per_cpu_zonestat has a non-zero size]
> [vbabka@suse.cz: Init zone->per_cpu_zonestats properly]
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

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

  reply	other threads:[~2021-04-22 12:19 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 11:14 [PATCH 0/9 v5] Use local_lock for pcp protection and reduce stat overhead Mel Gorman
2021-04-22 11:14 ` [PATCH 1/9] mm/page_alloc: Split per cpu page lists and zone stats Mel Gorman
2021-04-22 12:19   ` Vlastimil Babka [this message]
2021-04-22 11:14 ` [PATCH 2/9] mm/page_alloc: Convert per-cpu list protection to local_lock Mel Gorman
2021-04-22 12:34   ` Vlastimil Babka
2021-04-22 11:14 ` [PATCH 3/9] mm/vmstat: Convert NUMA statistics to basic NUMA counters Mel Gorman
2021-04-22 15:18   ` Vlastimil Babka
2021-04-23  8:32     ` Mel Gorman
2021-04-22 11:14 ` [PATCH 4/9] mm/vmstat: Inline NUMA event counter updates Mel Gorman
2021-04-22 11:14 ` [PATCH 5/9] mm/page_alloc: Batch the accounting updates in the bulk allocator Mel Gorman
2021-04-22 11:14 ` [PATCH 6/9] mm/page_alloc: Reduce duration that IRQs are disabled for VM counters Mel Gorman
2021-04-22 11:14 ` [PATCH 7/9] mm/page_alloc: Explicitly acquire the zone lock in __free_pages_ok Mel Gorman
2021-04-22 11:14 ` [PATCH 8/9] mm/page_alloc: Avoid conflating IRQs disabled with zone->lock Mel Gorman
2021-04-22 11:14 ` [PATCH 9/9] mm/page_alloc: Update PGFREE outside the zone lock in __free_pages_ok Mel Gorman
2021-05-12  9:54 [PATCH 0/9 v6] Use local_lock for pcp protection and reduce stat overhead Mel Gorman
2021-05-12  9:54 ` [PATCH 1/9] mm/page_alloc: Split per cpu page lists and zone stats Mel Gorman

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