From: Alex Shi <alex.shi@linux.alibaba.com> To: akpm@linux-foundation.org, mgorman@techsingularity.net, tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shakeelb@google.com, iamjoonsoo.kim@lge.com, richard.weiyang@gmail.com, kirill@shutemov.name, alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com, vdavydov.dev@gmail.com, shy828301@gmail.com Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>, Stephen Rothwell <sfr@canb.auug.org.au> Subject: [PATCH v18 29/32] mm: Identify compound pages sooner in isolate_migratepages_block Date: Mon, 24 Aug 2020 20:55:02 +0800 [thread overview] Message-ID: <1598273705-69124-30-git-send-email-alex.shi@linux.alibaba.com> (raw) In-Reply-To: <1598273705-69124-1-git-send-email-alex.shi@linux.alibaba.com> From: Alexander Duyck <alexander.h.duyck@linux.intel.com> Since we are holding a reference to the page much sooner in isolate_migratepages_block we can move the PageCompound check out of the LRU locked section and instead just place it after get_page_unless_zero. By doing this we can allow any of the items that might trigger a failure to trigger a failure for the compound page rather than the order 0 page and as a result we should be able to process the pageblock faster. In addition by testing for PageCompound sooner we can avoid having the LRU flag cleared and then reset in the exception case. As a result this should prevent possible races where another thread might be attempting to pull the LRU pages from the list. Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org --- mm/compaction.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index 6bf5ccd8fcf6..a0e48d079124 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -984,6 +984,24 @@ static bool too_many_isolated(pg_data_t *pgdat) if (unlikely(!get_page_unless_zero(page))) goto isolate_fail; + /* + * Page is compound. We know the order before we know if it is + * on the LRU so we cannot assume it is THP. However since the + * page will have the LRU validated shortly we can use the value + * to skip over this page for now or validate the LRU is set and + * then isolate the entire compound page if we are isolating to + * generate a CMA page. + */ + if (PageCompound(page)) { + const unsigned int order = compound_order(page); + + if (likely(order < MAX_ORDER)) + low_pfn += (1UL << order) - 1; + + if (!cc->alloc_contig) + goto isolate_fail_put; + } + if (__isolate_lru_page_prepare(page, isolate_mode) != 0) goto isolate_fail_put; @@ -1009,23 +1027,8 @@ static bool too_many_isolated(pg_data_t *pgdat) if (test_and_set_skip(cc, page, low_pfn)) goto isolate_abort; } - - /* - * Page become compound since the non-locked check, - * and it's on LRU. It can only be a THP so the order - * is safe to read and it's 0 for tail pages. - */ - if (unlikely(PageCompound(page) && !cc->alloc_contig)) { - low_pfn += compound_nr(page) - 1; - SetPageLRU(page); - goto isolate_fail_put; - } } - /* The whole page is taken off the LRU; skip the tail pages. */ - if (PageCompound(page)) - low_pfn += compound_nr(page) - 1; - /* Successfully isolated */ del_page_from_lru_list(page, lruvec, page_lru(page)); mod_node_page_state(page_pgdat(page), -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Alex Shi <alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org> To: akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org, tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, khlebnikov-XoJtRXgx1JseBXzfvpsJ4g@public.gmane.org, daniel.m.jordan-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org, lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org, richard.weiyang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org, alexander.duyck-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, rong.a.chen-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, mhocko-IBi9RG/b67k@public.gmane.org, vdavydov.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, shy828301-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Cc: Alexander Duyck <alexander.h.duyck-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, Stephen Rothwell <sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org> Subject: [PATCH v18 29/32] mm: Identify compound pages sooner in isolate_migratepages_block Date: Mon, 24 Aug 2020 20:55:02 +0800 [thread overview] Message-ID: <1598273705-69124-30-git-send-email-alex.shi@linux.alibaba.com> (raw) In-Reply-To: <1598273705-69124-1-git-send-email-alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org> From: Alexander Duyck <alexander.h.duyck-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Since we are holding a reference to the page much sooner in isolate_migratepages_block we can move the PageCompound check out of the LRU locked section and instead just place it after get_page_unless_zero. By doing this we can allow any of the items that might trigger a failure to trigger a failure for the compound page rather than the order 0 page and as a result we should be able to process the pageblock faster. In addition by testing for PageCompound sooner we can avoid having the LRU flag cleared and then reset in the exception case. As a result this should prevent possible races where another thread might be attempting to pull the LRU pages from the list. Signed-off-by: Alexander Duyck <alexander.h.duyck-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Signed-off-by: Alex Shi <alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org> Cc: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> Cc: Stephen Rothwell <sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org> Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org --- mm/compaction.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index 6bf5ccd8fcf6..a0e48d079124 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -984,6 +984,24 @@ static bool too_many_isolated(pg_data_t *pgdat) if (unlikely(!get_page_unless_zero(page))) goto isolate_fail; + /* + * Page is compound. We know the order before we know if it is + * on the LRU so we cannot assume it is THP. However since the + * page will have the LRU validated shortly we can use the value + * to skip over this page for now or validate the LRU is set and + * then isolate the entire compound page if we are isolating to + * generate a CMA page. + */ + if (PageCompound(page)) { + const unsigned int order = compound_order(page); + + if (likely(order < MAX_ORDER)) + low_pfn += (1UL << order) - 1; + + if (!cc->alloc_contig) + goto isolate_fail_put; + } + if (__isolate_lru_page_prepare(page, isolate_mode) != 0) goto isolate_fail_put; @@ -1009,23 +1027,8 @@ static bool too_many_isolated(pg_data_t *pgdat) if (test_and_set_skip(cc, page, low_pfn)) goto isolate_abort; } - - /* - * Page become compound since the non-locked check, - * and it's on LRU. It can only be a THP so the order - * is safe to read and it's 0 for tail pages. - */ - if (unlikely(PageCompound(page) && !cc->alloc_contig)) { - low_pfn += compound_nr(page) - 1; - SetPageLRU(page); - goto isolate_fail_put; - } } - /* The whole page is taken off the LRU; skip the tail pages. */ - if (PageCompound(page)) - low_pfn += compound_nr(page) - 1; - /* Successfully isolated */ del_page_from_lru_list(page, lruvec, page_lru(page)); mod_node_page_state(page_pgdat(page), -- 1.8.3.1
next prev parent reply other threads:[~2020-08-24 12:56 UTC|newest] Thread overview: 201+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-24 12:54 [PATCH v18 00/32] per memcg lru_lock Alex Shi 2020-08-24 12:54 ` [PATCH v18 01/32] mm/memcg: warning on !memcg after readahead page charged Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 02/32] mm/memcg: bail out early from swap accounting when memcg is disabled Alex Shi 2020-08-24 12:54 ` [PATCH v18 03/32] mm/thp: move lru_add_page_tail func to huge_memory.c Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 04/32] mm/thp: clean up lru_add_page_tail Alex Shi 2020-08-24 12:54 ` [PATCH v18 05/32] mm/thp: remove code path which never got into Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 06/32] mm/thp: narrow lru locking Alex Shi 2020-09-10 13:49 ` Matthew Wilcox 2020-09-10 13:49 ` Matthew Wilcox 2020-09-11 3:37 ` Alex Shi 2020-09-11 3:37 ` Alex Shi 2020-09-13 15:27 ` Matthew Wilcox 2020-09-13 15:27 ` Matthew Wilcox 2020-09-19 1:00 ` Hugh Dickins 2020-09-19 1:00 ` Hugh Dickins 2020-08-24 12:54 ` [PATCH v18 07/32] mm/swap.c: stop deactivate_file_page if page not on lru Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 08/32] mm/vmscan: remove unnecessary lruvec adding Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 09/32] mm/page_idle: no unlikely double check for idle page counting Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 10/32] mm/compaction: rename compact_deferred as compact_should_defer Alex Shi 2020-08-24 12:54 ` [PATCH v18 11/32] mm/memcg: add debug checking in lock_page_memcg Alex Shi 2020-08-24 12:54 ` [PATCH v18 12/32] mm/memcg: optimize mem_cgroup_page_lruvec Alex Shi 2020-08-24 12:54 ` [PATCH v18 13/32] mm/swap.c: fold vm event PGROTATED into pagevec_move_tail_fn Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 14/32] mm/lru: move lru_lock holding in func lru_note_cost_page Alex Shi 2020-08-24 12:54 ` [PATCH v18 15/32] mm/lru: move lock into lru_note_cost Alex Shi 2020-09-21 21:36 ` Hugh Dickins 2020-09-21 21:36 ` Hugh Dickins 2020-09-21 21:36 ` Hugh Dickins 2020-09-21 22:03 ` Hugh Dickins 2020-09-21 22:03 ` Hugh Dickins 2020-09-22 3:39 ` Alex Shi 2020-09-22 3:39 ` Alex Shi 2020-09-22 3:38 ` Alex Shi 2020-09-22 3:38 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 16/32] mm/lru: introduce TestClearPageLRU Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-09-21 23:16 ` Hugh Dickins 2020-09-21 23:16 ` Hugh Dickins 2020-09-21 23:16 ` Hugh Dickins 2020-09-22 3:53 ` Alex Shi 2020-09-22 3:53 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 17/32] mm/compaction: do page isolation first in compaction Alex Shi 2020-09-21 23:49 ` Hugh Dickins 2020-09-21 23:49 ` Hugh Dickins 2020-09-22 4:57 ` Alex Shi 2020-09-22 4:57 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 18/32] mm/thp: add tail pages into lru anyway in split_huge_page() Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 19/32] mm/swap.c: serialize memcg changes in pagevec_lru_move_fn Alex Shi 2020-09-22 0:42 ` Hugh Dickins 2020-09-22 0:42 ` Hugh Dickins 2020-09-22 0:42 ` Hugh Dickins 2020-09-22 5:00 ` Alex Shi 2020-09-22 5:00 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 20/32] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi 2020-09-22 5:27 ` Hugh Dickins 2020-09-22 5:27 ` Hugh Dickins 2020-09-22 5:27 ` Hugh Dickins 2020-09-22 8:58 ` Alex Shi 2020-09-22 8:58 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 21/32] mm/lru: introduce the relock_page_lruvec function Alex Shi 2020-09-22 5:40 ` Hugh Dickins 2020-09-22 5:40 ` Hugh Dickins 2020-09-22 5:40 ` Hugh Dickins 2020-08-24 12:54 ` [PATCH v18 22/32] mm/vmscan: use relock for move_pages_to_lru Alex Shi 2020-09-22 5:44 ` Hugh Dickins 2020-09-22 5:44 ` Hugh Dickins 2020-09-23 1:55 ` Alex Shi 2020-09-23 1:55 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 23/32] mm/lru: revise the comments of lru_lock Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-09-22 5:48 ` Hugh Dickins 2020-09-22 5:48 ` Hugh Dickins 2020-08-24 12:54 ` [PATCH v18 24/32] mm/pgdat: remove pgdat lru_lock Alex Shi 2020-09-22 5:53 ` Hugh Dickins 2020-09-22 5:53 ` Hugh Dickins 2020-09-23 1:55 ` Alex Shi 2020-09-23 1:55 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 25/32] mm/mlock: remove lru_lock on TestClearPageMlocked in munlock_vma_page Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-26 5:52 ` Alex Shi 2020-08-26 5:52 ` Alex Shi 2020-09-22 6:13 ` Hugh Dickins 2020-09-22 6:13 ` Hugh Dickins 2020-09-22 6:13 ` Hugh Dickins 2020-09-23 1:58 ` Alex Shi 2020-09-23 1:58 ` Alex Shi 2020-08-24 12:54 ` [PATCH v18 26/32] mm/mlock: remove __munlock_isolate_lru_page Alex Shi 2020-08-24 12:54 ` Alex Shi 2020-08-24 12:55 ` [PATCH v18 27/32] mm/swap.c: optimizing __pagevec_lru_add lru_lock Alex Shi 2020-08-24 12:55 ` Alex Shi 2020-08-26 9:07 ` Alex Shi 2020-08-24 12:55 ` [PATCH v18 28/32] mm/compaction: Drop locked from isolate_migratepages_block Alex Shi 2020-08-24 12:55 ` Alex Shi [this message] 2020-08-24 12:55 ` [PATCH v18 29/32] mm: Identify compound pages sooner in isolate_migratepages_block Alex Shi 2020-08-24 12:55 ` [PATCH v18 30/32] mm: Drop use of test_and_set_skip in favor of just setting skip Alex Shi 2020-08-24 12:55 ` [PATCH v18 31/32] mm: Add explicit page decrement in exception path for isolate_lru_pages Alex Shi 2020-08-24 12:55 ` Alex Shi 2020-09-09 1:01 ` Matthew Wilcox 2020-09-09 1:01 ` Matthew Wilcox 2020-09-09 15:43 ` Alexander Duyck 2020-09-09 15:43 ` Alexander Duyck 2020-09-09 15:43 ` Alexander Duyck 2020-09-09 17:07 ` Matthew Wilcox 2020-09-09 17:07 ` Matthew Wilcox 2020-09-09 18:24 ` Hugh Dickins 2020-09-09 18:24 ` Hugh Dickins 2020-09-09 18:24 ` Hugh Dickins 2020-09-09 20:15 ` Matthew Wilcox 2020-09-09 20:15 ` Matthew Wilcox 2020-09-09 21:05 ` Hugh Dickins 2020-09-09 21:05 ` Hugh Dickins 2020-09-09 21:05 ` Hugh Dickins 2020-09-09 21:17 ` Alexander Duyck 2020-09-09 21:17 ` Alexander Duyck 2020-09-09 21:17 ` Alexander Duyck 2020-08-24 12:55 ` [PATCH v18 32/32] mm: Split release_pages work into 3 passes Alex Shi 2020-08-24 12:55 ` Alex Shi 2020-08-24 18:42 ` [PATCH v18 00/32] per memcg lru_lock Andrew Morton 2020-08-24 19:50 ` Qian Cai 2020-08-24 19:50 ` Qian Cai 2020-08-24 20:24 ` Hugh Dickins 2020-08-24 20:24 ` Hugh Dickins 2020-08-24 20:24 ` Hugh Dickins 2020-08-25 1:56 ` Daniel Jordan 2020-08-25 1:56 ` Daniel Jordan 2020-08-25 3:26 ` Alex Shi 2020-08-25 3:26 ` Alex Shi 2020-08-25 11:39 ` Matthew Wilcox 2020-08-25 11:39 ` Matthew Wilcox 2020-08-26 1:19 ` Daniel Jordan 2020-08-26 8:59 ` Alex Shi 2020-08-26 8:59 ` Alex Shi 2020-08-28 1:40 ` Daniel Jordan 2020-08-28 1:40 ` Daniel Jordan 2020-08-28 5:22 ` Alex Shi 2020-08-28 5:22 ` Alex Shi 2020-09-09 2:44 ` Aaron Lu 2020-09-09 2:44 ` Aaron Lu 2020-09-09 11:40 ` Michal Hocko 2020-08-25 8:52 ` Alex Shi 2020-08-25 8:52 ` Alex Shi 2020-08-25 13:00 ` Alex Shi 2020-08-25 13:00 ` Alex Shi 2020-08-27 7:01 ` Hugh Dickins 2020-08-27 7:01 ` Hugh Dickins 2020-08-27 12:20 ` Race between freeing and waking page Matthew Wilcox 2020-09-08 23:41 ` [PATCH v18 00/32] per memcg lru_lock: reviews Hugh Dickins 2020-09-08 23:41 ` Hugh Dickins 2020-09-09 2:24 ` Wei Yang 2020-09-09 2:24 ` Wei Yang 2020-09-09 15:08 ` Alex Shi 2020-09-09 15:08 ` Alex Shi 2020-09-09 23:16 ` Hugh Dickins 2020-09-09 23:16 ` Hugh Dickins 2020-09-11 2:50 ` Alex Shi 2020-09-11 2:50 ` Alex Shi 2020-09-12 2:13 ` Hugh Dickins 2020-09-12 2:13 ` Hugh Dickins 2020-09-13 14:21 ` Alex Shi 2020-09-13 14:21 ` Alex Shi 2020-09-15 8:21 ` Hugh Dickins 2020-09-15 8:21 ` Hugh Dickins 2020-09-15 8:21 ` Hugh Dickins 2020-09-15 16:58 ` Daniel Jordan 2020-09-15 16:58 ` Daniel Jordan 2020-09-16 12:44 ` Alex Shi 2020-09-17 2:37 ` Alex Shi 2020-09-17 2:37 ` Alex Shi 2020-09-17 14:35 ` Daniel Jordan 2020-09-17 14:35 ` Daniel Jordan 2020-09-17 15:39 ` Alexander Duyck 2020-09-17 15:39 ` Alexander Duyck 2020-09-17 15:39 ` Alexander Duyck 2020-09-17 16:48 ` Daniel Jordan 2020-09-17 16:48 ` Daniel Jordan 2020-09-12 8:38 ` Hugh Dickins 2020-09-12 8:38 ` Hugh Dickins 2020-09-12 8:38 ` Hugh Dickins 2020-09-13 14:22 ` Alex Shi 2020-09-13 14:22 ` Alex Shi 2020-09-09 16:11 ` Alexander Duyck 2020-09-09 16:11 ` Alexander Duyck 2020-09-09 16:11 ` Alexander Duyck 2020-09-10 0:32 ` Hugh Dickins 2020-09-10 0:32 ` Hugh Dickins 2020-09-10 0:32 ` Hugh Dickins 2020-09-10 14:24 ` Alexander Duyck 2020-09-10 14:24 ` Alexander Duyck 2020-09-10 14:24 ` Alexander Duyck 2020-09-12 5:12 ` Hugh Dickins 2020-09-12 5:12 ` Hugh Dickins 2020-09-12 5:12 ` Hugh Dickins 2020-08-25 7:21 ` [PATCH v18 00/32] per memcg lru_lock Michal Hocko 2020-08-25 7:21 ` Michal Hocko
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