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SubjectRe: [RFC 3/5] mm, page_alloc(): remove setup_pageset()
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On 07.09.20 18:36, Vlastimil Babka wrote:
> 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 specific
> values.
>

subject: s/page_alloc()/page_alloc/ to make it look consistent

> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/page_alloc.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f669a251f654..a0cab2c6055e 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5902,7 +5902,7 @@ 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();
> @@ -6228,12 +6228,13 @@ 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. Proper pageset's
> + * initialization will update them.
> + */
> + pcp->high = 0;
> + pcp->batch = 1;
> }
>
> static void zone_set_pageset_high_and_batch(struct zone *zone)
>

Had the same thought about barriers being useless when the pageset is
not hot.

LGTM

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Thanks,

David / dhildenb

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