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Tue, 29 Sep 2020 06:12:22 -0400 X-MC-Unique: T1dUa26qPwWeARzi7KwelQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B708D8015DB; Tue, 29 Sep 2020 10:12:19 +0000 (UTC) Received: from [10.36.112.157] (ovpn-112-157.ams2.redhat.com [10.36.112.157]) by smtp.corp.redhat.com (Postfix) with ESMTP id D006B7A431; Tue, 29 Sep 2020 10:12:15 +0000 (UTC) Subject: Re: [PATCH v1 3/5] mm/page_alloc: always move pages to the tail of the freelist in unset_migratetype_isolate() To: Wei Yang Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, Andrew Morton , Oscar Salvador , Alexander Duyck , Mel Gorman , Michal Hocko , Dave Hansen , Vlastimil Babka , Mike Rapoport , Scott Cheloha , Michael Ellerman References: <20200928182110.7050-1-david@redhat.com> <20200928182110.7050-4-david@redhat.com> <20200929091803.GB36904@L-31X9LVDL-1304.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200929091803.GB36904@L-31X9LVDL-1304.local> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On 29.09.20 11:18, Wei Yang wrote: > On Mon, Sep 28, 2020 at 08:21:08PM +0200, David Hildenbrand wrote: >> Page isolation doesn't actually touch the pages, it simply isolates >> pageblocks and moves all free pages to the MIGRATE_ISOLATE freelist. >> >> We already place pages to the tail of the freelists when undoing >> isolation via __putback_isolated_page(), let's do it in any case >> (e.g., if order <= pageblock_order) and document the behavior. >> >> Add a "to_tail" parameter to move_freepages_block() but introduce a >> a new move_to_free_list_tail() - similar to add_to_free_list_tail(). s/a a/a/ >> >> This change results in all pages getting onlined via online_pages() to >> be placed to the tail of the freelist. >> >> Reviewed-by: Oscar Salvador >> Cc: Andrew Morton >> Cc: Alexander Duyck >> Cc: Mel Gorman >> Cc: Michal Hocko >> Cc: Dave Hansen >> Cc: Vlastimil Babka >> Cc: Wei Yang >> Cc: Oscar Salvador >> Cc: Mike Rapoport >> Cc: Scott Cheloha >> Cc: Michael Ellerman >> Signed-off-by: David Hildenbrand >> --- >> include/linux/page-isolation.h | 4 ++-- >> mm/page_alloc.c | 35 +++++++++++++++++++++++----------- >> mm/page_isolation.c | 12 +++++++++--- >> 3 files changed, 35 insertions(+), 16 deletions(-) >> >> diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h >> index 572458016331..3eca9b3c5305 100644 >> --- a/include/linux/page-isolation.h >> +++ b/include/linux/page-isolation.h >> @@ -36,8 +36,8 @@ static inline bool is_migrate_isolate(int migratetype) >> struct page *has_unmovable_pages(struct zone *zone, struct page *page, >> int migratetype, int flags); >> void set_pageblock_migratetype(struct page *page, int migratetype); >> -int move_freepages_block(struct zone *zone, struct page *page, >> - int migratetype, int *num_movable); >> +int move_freepages_block(struct zone *zone, struct page *page, int migratetype, >> + bool to_tail, int *num_movable); >> >> /* >> * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE. >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index 9e3ed4a6f69a..d5a5f528b8ca 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -905,6 +905,15 @@ static inline void move_to_free_list(struct page *page, struct zone *zone, >> list_move(&page->lru, &area->free_list[migratetype]); >> } >> >> +/* Used for pages which are on another list */ >> +static inline void move_to_free_list_tail(struct page *page, struct zone *zone, >> + unsigned int order, int migratetype) >> +{ >> + struct free_area *area = &zone->free_area[order]; >> + >> + list_move_tail(&page->lru, &area->free_list[migratetype]); >> +} >> + > > Would it be better to pass the *to_tail* to move_to_free_list(), so we won't > have a new function? Hi, thanks for the review! See discussion in RFC + cover letter: "Add a "to_tail" parameter to move_freepages_block() but introduce a new move_to_free_list_tail() - similar to add_to_free_list_tail()."