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From: Vlastimil Babka <vbabka@suse.cz>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, Michal Hocko <mhocko@kernel.org>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	David Hildenbrand <david@redhat.com>,
	Oscar Salvador <osalvador@suse.de>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH v2 3/7] mm, page_alloc: remove setup_pageset()
Date: Thu,  8 Oct 2020 13:41:57 +0200	[thread overview]
Message-ID: <20201008114201.18824-4-vbabka@suse.cz> (raw)
In-Reply-To: <20201008114201.18824-1-vbabka@suse.cz>

We initialize boot-time pagesets with setup_pageset(), which sets high and
batch values that effectively disable pcplists.

We can remove this wrapper if we just set these values for all pagesets in
pageset_init(). Non-boot pagesets then subsequently update them to the proper
values.

No functional change.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 mm/page_alloc.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 463f40b12aca..f827b42a2475 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5899,7 +5899,7 @@ static void build_zonelists(pg_data_t *pgdat)
  * not check if the processor is online before following the pageset pointer.
  * Other parts of the kernel may not check if the zone is available.
  */
-static void setup_pageset(struct per_cpu_pageset *p);
+static void pageset_init(struct per_cpu_pageset *p);
 static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
 static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
 
@@ -5967,7 +5967,7 @@ build_all_zonelists_init(void)
 	 * (a chicken-egg dilemma).
 	 */
 	for_each_possible_cpu(cpu)
-		setup_pageset(&per_cpu(boot_pageset, cpu));
+		pageset_init(&per_cpu(boot_pageset, cpu));
 
 	mminit_verify_zonelist();
 	cpuset_init_current_mems_allowed();
@@ -6286,12 +6286,15 @@ static void pageset_init(struct per_cpu_pageset *p)
 	pcp = &p->pcp;
 	for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++)
 		INIT_LIST_HEAD(&pcp->lists[migratetype]);
-}
 
-static void setup_pageset(struct per_cpu_pageset *p)
-{
-	pageset_init(p);
-	pageset_update(&p->pcp, 0, 1);
+	/*
+	 * Set batch and high values safe for a boot pageset. A true percpu
+	 * pageset's initialization will update them subsequently. Here we don't
+	 * need to be as careful as pageset_update() as nobody can access the
+	 * pageset yet.
+	 */
+	pcp->high = 0;
+	pcp->batch = 1;
 }
 
 /*
-- 
2.28.0



  parent reply	other threads:[~2020-10-08 11:42 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 11:41 [PATCH v2 0/7] disable pcplists during memory offline Vlastimil Babka
2020-10-08 11:41 ` [PATCH v2 1/7] mm, page_alloc: clean up pageset high and batch update Vlastimil Babka
2020-10-25 14:17   ` Mike Rapoport
2020-10-08 11:41 ` [PATCH v2 2/7] mm, page_alloc: calculate pageset high and batch once per zone Vlastimil Babka
2020-10-08 11:41 ` Vlastimil Babka [this message]
2020-10-08 12:23   ` [PATCH v2 3/7] mm, page_alloc: remove setup_pageset() Michal Hocko
2020-10-08 12:56     ` Vlastimil Babka
2020-10-08 13:03       ` Michal Hocko
2020-10-22 12:34   ` Oscar Salvador
2020-10-08 11:41 ` [PATCH v2 4/7] mm, page_alloc: simplify pageset_update() Vlastimil Babka
2020-10-22 12:39   ` Oscar Salvador
2020-10-08 11:41 ` [PATCH v2 5/7] mm, page_alloc: cache pageset high and batch in struct zone Vlastimil Babka
2020-10-08 12:31   ` Michal Hocko
2020-10-08 17:55     ` Vlastimil Babka
2020-10-22 12:42       ` Oscar Salvador
2020-10-08 11:42 ` [PATCH v2 6/7] mm, page_alloc: move draining pcplists to page isolation users Vlastimil Babka
2020-10-22 12:44   ` Oscar Salvador
2020-10-08 11:42 ` [PATCH v2 7/7] mm, page_alloc: disable pcplists during memory offline Vlastimil Babka
2020-10-08 12:45   ` Michal Hocko
2020-10-08 17:46     ` Vlastimil Babka
2020-10-22 12:52   ` Oscar Salvador

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