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UPSTREAM: mm, page_alloc: move draining pcplists to page isolation users

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Currently, pcplists are drained during set_migratetype_isolate() which
means once per pageblock processed start_isolate_page_range().  This is
somewhat wasteful.  Moreover, the callers might need different guarantees,
and the draining is currently prone to races and does not guarantee that
no page from isolated pageblock will end up on the pcplist after the
drain.

Better guarantees are added by later patches and require explicit actions
by page isolation users that need them.  Thus it makes sense to move the
current imperfect draining to the callers also as a preparation step.

Link: https://lkml.kernel.org/r/20201111092812.11329-7-vbabka@suse.cz
Suggested-by: David Hildenbrand <david@redhat.com>
Suggested-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 7612921f2376d51d020ae2f06ffb7da40422b75b)
Change-Id: I10fc574024606c499ddda325d188d181aff7ceec
This commit is contained in:
Vlastimil Babka
2020-12-14 19:10:56 -08:00
committed by Todd Kjos
parent 13bc06efd9
commit b1e4543c27
3 changed files with 13 additions and 10 deletions
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2
mm/page_alloc.c
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@@ -8712,6 +8712,8 @@ int alloc_contig_range(unsigned long start, unsigned long end,
if (ret)
return ret;
drain_all_pages(cc.zone);
/*
* In case of -EBUSY, we'd like to know which page causes problem.
* So, just fall through. test_pages_isolated() has a tracepoint