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: [RFC 2/5] mm, page_alloc: calculate pageset high and batch once per zone
Date: Mon, 7 Sep 2020 18:36:25 +0200 [thread overview]
Message-ID: <20200907163628.26495-3-vbabka@suse.cz> (raw)
In-Reply-To: <20200907163628.26495-1-vbabka@suse.cz>
We currently call pageset_set_high_and_batch() for each possible cpu,
which repeats the same calculations of high and batch values.
Instead call it once per zone, and it applies the calculated values
to all per-cpu pagesets of the zone.
This also allows removing zone_pageset_init() and __zone_pcp_update() wrappers.
No functional change.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
mm/page_alloc.c | 40 +++++++++++++++++-----------------------
1 file changed, 17 insertions(+), 23 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0b516208afda..f669a251f654 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6236,12 +6236,13 @@ static void setup_pageset(struct per_cpu_pageset *p)
pageset_update(&p->pcp, 0, 1);
}
-static void pageset_set_high_and_batch(struct zone *zone,
- struct per_cpu_pageset *p)
+static void zone_set_pageset_high_and_batch(struct zone *zone)
{
unsigned long new_high;
unsigned long new_batch;
int fraction = READ_ONCE(percpu_pagelist_fraction);
+ int cpu;
+ struct per_cpu_pageset *p;
if (fraction) {
new_high = zone_managed_pages(zone) / fraction;
@@ -6253,23 +6254,25 @@ static void pageset_set_high_and_batch(struct zone *zone,
new_high = 6 * new_batch;
new_batch = max(1UL, 1 * new_batch);
}
- pageset_update(&p->pcp, new_high, new_batch);
-}
-
-static void __meminit zone_pageset_init(struct zone *zone, int cpu)
-{
- struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu);
- pageset_init(pcp);
- pageset_set_high_and_batch(zone, pcp);
+ for_each_possible_cpu(cpu) {
+ p = per_cpu_ptr(zone->pageset, cpu);
+ pageset_update(&p->pcp, new_high, new_batch);
+ }
}
void __meminit setup_zone_pageset(struct zone *zone)
{
int cpu;
+ struct per_cpu_pageset *p;
+
zone->pageset = alloc_percpu(struct per_cpu_pageset);
- for_each_possible_cpu(cpu)
- zone_pageset_init(zone, cpu);
+ for_each_possible_cpu(cpu) {
+ p = per_cpu_ptr(zone->pageset, cpu);
+ pageset_init(p);
+ }
+
+ zone_set_pageset_high_and_batch(zone);
}
/*
@@ -8002,15 +8005,6 @@ int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write,
return 0;
}
-static void __zone_pcp_update(struct zone *zone)
-{
- unsigned int cpu;
-
- for_each_possible_cpu(cpu)
- pageset_set_high_and_batch(zone,
- per_cpu_ptr(zone->pageset, cpu));
-}
-
/*
* percpu_pagelist_fraction - changes the pcp->high for each zone on each
* cpu. It is the fraction of total pages in each zone that a hot per cpu
@@ -8043,7 +8037,7 @@ int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write,
goto out;
for_each_populated_zone(zone)
- __zone_pcp_update(zone);
+ zone_set_pageset_high_and_batch(zone);
out:
mutex_unlock(&pcp_batch_high_lock);
return ret;
@@ -8659,7 +8653,7 @@ EXPORT_SYMBOL(free_contig_range);
void __meminit zone_pcp_update(struct zone *zone)
{
mutex_lock(&pcp_batch_high_lock);
- __zone_pcp_update(zone);
+ zone_set_pageset_high_and_batch(zone);
mutex_unlock(&pcp_batch_high_lock);
}
--
2.28.0
next prev parent reply other threads:[~2020-09-07 16:42 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-07 16:36 [RFC 0/5] disable pcplists during page isolation Vlastimil Babka
2020-09-07 16:36 ` [RFC 1/5] mm, page_alloc: clean up pageset high and batch update Vlastimil Babka
2020-09-10 8:31 ` Oscar Salvador
2020-09-10 8:34 ` Oscar Salvador
2020-09-10 10:47 ` David Hildenbrand
2020-09-17 16:05 ` Vlastimil Babka
2020-09-07 16:36 ` Vlastimil Babka [this message]
2020-09-10 9:00 ` [RFC 2/5] mm, page_alloc: calculate pageset high and batch once per zone Oscar Salvador
2020-09-10 10:56 ` David Hildenbrand
2020-09-07 16:36 ` [RFC 3/5] mm, page_alloc(): remove setup_pageset() Vlastimil Babka
2020-09-10 9:23 ` Oscar Salvador
2020-09-10 9:57 ` Oscar Salvador
2020-09-18 9:37 ` Vlastimil Babka
2020-09-10 11:00 ` David Hildenbrand
2020-09-07 16:36 ` [RFC 4/5] mm, page_alloc: cache pageset high and batch in struct zone Vlastimil Babka
2020-09-10 11:30 ` Oscar Salvador
2020-09-18 12:02 ` Vlastimil Babka
2020-09-07 16:36 ` [RFC 5/5] mm, page_alloc: disable pcplists during page isolation Vlastimil Babka
2020-09-09 10:48 ` Vlastimil Babka
2020-09-09 11:36 ` Michal Hocko
2020-09-09 11:44 ` David Hildenbrand
2020-09-09 12:57 ` David Hildenbrand
2020-09-09 11:55 ` Vlastimil Babka
2020-09-10 10:29 ` David Hildenbrand
2020-09-10 11:05 ` Vlastimil Babka
2020-09-10 12:42 ` David Hildenbrand
2020-09-09 12:53 ` Pavel Tatashin
2020-09-08 18:29 ` [RFC 0/5] " David Hildenbrand
2020-09-09 10:54 ` Vlastimil Babka
2020-09-09 11:27 ` osalvador
2020-09-09 11:29 ` David Hildenbrand
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