mm, page_alloc: calculate pageset high and batch once per zone

We currently call pageset_set_high_and_batch() for each possible cpu,
which repeats the same calculations of high and batch values.

Instead call the function just once per zone, and make it apply the
calculated values to all per-cpu pagesets of the zone.

This also allows removing the zone_pageset_init() and __zone_pcp_update()
wrappers.

No functional change.

Link: https://lkml.kernel.org/r/20201111092812.11329-3-vbabka@suse.cz


Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>