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Date: Fri, 1 Apr 2022 09:58:19 -0400 Message-Id: <20220401135820.1453829-1-zi.yan@sent.com> X-Mailer: git-send-email 2.35.1 Reply-To: Zi Yan MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: BBB082001B X-Rspam-User: Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=sent.com header.s=fm3 header.b=OuASuwFK; dkim=pass header.d=messagingengine.com header.s=fm3 header.b=f35dgA12; dmarc=pass (policy=none) header.from=sent.com; spf=pass (imf13.hostedemail.com: domain of zi.yan@sent.com designates 64.147.123.25 as permitted sender) smtp.mailfrom=zi.yan@sent.com X-Stat-Signature: 9xoxbifac7wtio9yybcuucgpdigydre4 X-HE-Tag: 1648821506-997570 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Zi Yan Move pageblock migratetype check code in the while loop to simplify the logic. It also saves redundant buddy page checking code. Suggested-by: Vlastimil Babka Link: https://lore.kernel.org/linux-mm/27ff69f9-60c5-9e59-feb2-295250077551= @suse.cz/ Signed-off-by: Zi Yan --- mm/page_alloc.c | 46 +++++++++++++++++----------------------------- 1 file changed, 17 insertions(+), 29 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 856473e54155..2ea106146686 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1054,7 +1054,6 @@ static inline void __free_one_page(struct page *page, int migratetype, fpi_t fpi_flags) { struct capture_control *capc =3D task_capc(zone); - unsigned int max_order =3D pageblock_order; unsigned long buddy_pfn; unsigned long combined_pfn; struct page *buddy; @@ -1070,8 +1069,7 @@ static inline void __free_one_page(struct page *page, VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page); VM_BUG_ON_PAGE(bad_range(zone, page), page); =20 -continue_merging: - while (order < max_order) { + while (order < MAX_ORDER - 1) { if (compaction_capture(capc, page, order, migratetype)) { __mod_zone_freepage_state(zone, -(1 << order), migratetype); @@ -1082,6 +1080,22 @@ static inline void __free_one_page(struct page *page, =20 if (!page_is_buddy(page, buddy, order)) goto done_merging; + + if (unlikely(order >=3D pageblock_order)) { + /* + * We want to prevent merge between freepages on pageblock + * without fallbacks and normal pageblock. Without this, + * pageblock isolation could cause incorrect freepage or CMA + * accounting or HIGHATOMIC accounting. + */ + int buddy_mt =3D get_pageblock_migratetype(buddy); + + if (migratetype !=3D buddy_mt + && (!migratetype_is_mergeable(migratetype) || + !migratetype_is_mergeable(buddy_mt))) + goto done_merging; + } + /* * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, * merge with it and move up one order. @@ -1095,32 +1109,6 @@ static inline void __free_one_page(struct page *page, pfn =3D combined_pfn; order++; } - if (order < MAX_ORDER - 1) { - /* If we are here, it means order is >=3D pageblock_order. - * We want to prevent merge between freepages on pageblock - * without fallbacks and normal pageblock. Without this, - * pageblock isolation could cause incorrect freepage or CMA - * accounting or HIGHATOMIC accounting. - * - * We don't want to hit this code for the more frequent - * low-order merging. - */ - int buddy_mt; - - buddy_pfn =3D __find_buddy_pfn(pfn, order); - buddy =3D page + (buddy_pfn - pfn); - - if (!page_is_buddy(page, buddy, order)) - goto done_merging; - buddy_mt =3D get_pageblock_migratetype(buddy); - - if (migratetype !=3D buddy_mt - && (!migratetype_is_mergeable(migratetype) || - !migratetype_is_mergeable(buddy_mt))) - goto done_merging; - max_order =3D order + 1; - goto continue_merging; - } =20 done_merging: set_buddy_order(page, order); --=20 2.35.1