From: Barry Song <21cnbao@gmail.com> To: Yu Zhao <yuzhao@google.com> Cc: "Stephen Rothwell" <sfr@rothwell.id.au>, Linux-MM <linux-mm@kvack.org>, "Andi Kleen" <ak@linux.intel.com>, "Andrew Morton" <akpm@linux-foundation.org>, "Aneesh Kumar" <aneesh.kumar@linux.ibm.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Hillf Danton" <hdanton@sina.com>, "Jens Axboe" <axboe@kernel.dk>, "Jesse Barnes" <jsbarnes@google.com>, "Johannes Weiner" <hannes@cmpxchg.org>, "Jonathan Corbet" <corbet@lwn.net>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Matthew Wilcox" <willy@infradead.org>, "Mel Gorman" <mgorman@suse.de>, "Michael Larabel" <Michael@michaellarabel.com>, "Michal Hocko" <mhocko@kernel.org>, "Mike Rapoport" <rppt@kernel.org>, "Rik van Riel" <riel@surriel.com>, "Vlastimil Babka" <vbabka@suse.cz>, "Will Deacon" <will@kernel.org>, "Ying Huang" <ying.huang@intel.com>, LAK <linux-arm-kernel@lists.infradead.org>, "Linux Doc Mailing List" <linux-doc@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, "Kernel Page Reclaim v2" <page-reclaim@google.com>, x86 <x86@kernel.org>, "Brian Geffon" <bgeffon@google.com>, "Jan Alexander Steffens" <heftig@archlinux.org>, "Oleksandr Natalenko" <oleksandr@natalenko.name>, "Steven Barrett" <steven@liquorix.net>, "Suleiman Souhlal" <suleiman@google.com>, "Daniel Byrne" <djbyrne@mtu.edu>, "Donald Carr" <d@chaos-reins.com>, "Holger Hoffstätte" <holger@applied-asynchrony.com>, "Konstantin Kharlamov" <Hi-Angel@yandex.ru>, "Shuang Zhai" <szhai2@cs.rochester.edu>, "Sofia Trinh" <sofia.trinh@edi.works>, "Vaibhav Jain" <vaibhav@linux.ibm.com> Subject: Re: [PATCH v10 06/14] mm: multi-gen LRU: minimal implementation Date: Fri, 15 Apr 2022 22:26:07 +1200 [thread overview] Message-ID: <CAGsJ_4yYP1Wv7_KqX+bo2u=YZNGAqYsLf8evekqz9Y6djbWD7Q@mail.gmail.com> (raw) In-Reply-To: <YliFs3NOHeo2LeXl@google.com> On Fri, Apr 15, 2022 at 8:36 AM Yu Zhao <yuzhao@google.com> wrote: > > On Thu, Apr 14, 2022 at 06:03:10PM +1200, Barry Song wrote: > > > > On Thu, Apr 7, 2022 at 3:16 PM Yu Zhao <yuzhao@google.com> wrote: > > > > > > + > > > +static int isolate_folios(struct lruvec *lruvec, struct scan_control *sc, int swappiness, > > > + int *type_scanned, struct list_head *list) > > > +{ > > > + int i; > > > + int type; > > > + int scanned; > > > + int tier = -1; > > > + DEFINE_MIN_SEQ(lruvec); > > > + > > > + VM_BUG_ON(!seq_is_valid(lruvec)); > > > + > > > + /* > > > + * Try to make the obvious choice first. When anon and file are both > > > + * available from the same generation, interpret swappiness 1 as file > > > + * first and 200 as anon first. > > > + */ > > > > Has this changed the ABI of swapiness? > > No. > > > or it is only something > > meaningful for the internal code? > > This is how swappiness is interpreted. > > > if so, can we rename it to > > something else? otherwise, it is quite confusing. > > Feel free to suggest something. > > > it seems 1 is set internally as a magic number here: > > +static void lru_gen_shrink_lruvec(struct lruvec *lruvec, struct > > scan_control *sc) > > +{ > > + ... > > + else if (!cgroup_reclaim(sc) && get_swappiness(lruvec, sc)) > > + swappiness = 1; > > + else > > + swappiness = 0; > > + } > > obviously this swappiness is neither /proc/sys/vm/swappiness nor > > /sys/fs/cgroup/memory/<group>/>memory.swappiness, right? > > Right. > > > > @@ -3928,6 +4726,11 @@ static void age_active_anon(struct pglist_data *pgdat, > > > struct mem_cgroup *memcg; > > > struct lruvec *lruvec; > > > > > > + if (lru_gen_enabled()) { > > > + lru_gen_age_node(pgdat, sc); > > > + return; > > > + } > > > > is it really a good place for lru_gen_age_node() since the function > > is named age_active_anon() > > but here you are doing aging for both anon and file pages? > > Yes. > > > obviously > > lru_gen_age_node() is not > > doing "age active anon". > ;> We can rename it if you have something in mind. i wonder if we can directly do: if (lru_gen_enabled()) lru_gen_age_node(pgdat, sc); else age_active_anon(); rather than: /* * Do some background aging of the anon list, to give * pages a chance to be referenced before reclaiming. All * pages are rotated regardless of classzone as this is * about consistent aging. */ age_active_anon() { if (lru_gen_enabled()) return lru_gen_age_node(pgdat, sc); } the comment above makes no sense to lru_gen_age_node(pgdat, sc); another way is that we can add a wrapper for them as below, age_node() { if (lru_gen_enabled()) return lru_gen_age_node(pgdat, sc); age_active_anon(); } Thanks Barry
WARNING: multiple messages have this Message-ID (diff)
From: Barry Song <21cnbao@gmail.com> To: Yu Zhao <yuzhao@google.com> Cc: "Stephen Rothwell" <sfr@rothwell.id.au>, Linux-MM <linux-mm@kvack.org>, "Andi Kleen" <ak@linux.intel.com>, "Andrew Morton" <akpm@linux-foundation.org>, "Aneesh Kumar" <aneesh.kumar@linux.ibm.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Hillf Danton" <hdanton@sina.com>, "Jens Axboe" <axboe@kernel.dk>, "Jesse Barnes" <jsbarnes@google.com>, "Johannes Weiner" <hannes@cmpxchg.org>, "Jonathan Corbet" <corbet@lwn.net>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Matthew Wilcox" <willy@infradead.org>, "Mel Gorman" <mgorman@suse.de>, "Michael Larabel" <Michael@michaellarabel.com>, "Michal Hocko" <mhocko@kernel.org>, "Mike Rapoport" <rppt@kernel.org>, "Rik van Riel" <riel@surriel.com>, "Vlastimil Babka" <vbabka@suse.cz>, "Will Deacon" <will@kernel.org>, "Ying Huang" <ying.huang@intel.com>, LAK <linux-arm-kernel@lists.infradead.org>, "Linux Doc Mailing List" <linux-doc@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, "Kernel Page Reclaim v2" <page-reclaim@google.com>, x86 <x86@kernel.org>, "Brian Geffon" <bgeffon@google.com>, "Jan Alexander Steffens" <heftig@archlinux.org>, "Oleksandr Natalenko" <oleksandr@natalenko.name>, "Steven Barrett" <steven@liquorix.net>, "Suleiman Souhlal" <suleiman@google.com>, "Daniel Byrne" <djbyrne@mtu.edu>, "Donald Carr" <d@chaos-reins.com>, "Holger Hoffstätte" <holger@applied-asynchrony.com>, "Konstantin Kharlamov" <Hi-Angel@yandex.ru>, "Shuang Zhai" <szhai2@cs.rochester.edu>, "Sofia Trinh" <sofia.trinh@edi.works>, "Vaibhav Jain" <vaibhav@linux.ibm.com> Subject: Re: [PATCH v10 06/14] mm: multi-gen LRU: minimal implementation Date: Fri, 15 Apr 2022 22:26:07 +1200 [thread overview] Message-ID: <CAGsJ_4yYP1Wv7_KqX+bo2u=YZNGAqYsLf8evekqz9Y6djbWD7Q@mail.gmail.com> (raw) In-Reply-To: <YliFs3NOHeo2LeXl@google.com> On Fri, Apr 15, 2022 at 8:36 AM Yu Zhao <yuzhao@google.com> wrote: > > On Thu, Apr 14, 2022 at 06:03:10PM +1200, Barry Song wrote: > > > > On Thu, Apr 7, 2022 at 3:16 PM Yu Zhao <yuzhao@google.com> wrote: > > > > > > + > > > +static int isolate_folios(struct lruvec *lruvec, struct scan_control *sc, int swappiness, > > > + int *type_scanned, struct list_head *list) > > > +{ > > > + int i; > > > + int type; > > > + int scanned; > > > + int tier = -1; > > > + DEFINE_MIN_SEQ(lruvec); > > > + > > > + VM_BUG_ON(!seq_is_valid(lruvec)); > > > + > > > + /* > > > + * Try to make the obvious choice first. When anon and file are both > > > + * available from the same generation, interpret swappiness 1 as file > > > + * first and 200 as anon first. > > > + */ > > > > Has this changed the ABI of swapiness? > > No. > > > or it is only something > > meaningful for the internal code? > > This is how swappiness is interpreted. > > > if so, can we rename it to > > something else? otherwise, it is quite confusing. > > Feel free to suggest something. > > > it seems 1 is set internally as a magic number here: > > +static void lru_gen_shrink_lruvec(struct lruvec *lruvec, struct > > scan_control *sc) > > +{ > > + ... > > + else if (!cgroup_reclaim(sc) && get_swappiness(lruvec, sc)) > > + swappiness = 1; > > + else > > + swappiness = 0; > > + } > > obviously this swappiness is neither /proc/sys/vm/swappiness nor > > /sys/fs/cgroup/memory/<group>/>memory.swappiness, right? > > Right. > > > > @@ -3928,6 +4726,11 @@ static void age_active_anon(struct pglist_data *pgdat, > > > struct mem_cgroup *memcg; > > > struct lruvec *lruvec; > > > > > > + if (lru_gen_enabled()) { > > > + lru_gen_age_node(pgdat, sc); > > > + return; > > > + } > > > > is it really a good place for lru_gen_age_node() since the function > > is named age_active_anon() > > but here you are doing aging for both anon and file pages? > > Yes. > > > obviously > > lru_gen_age_node() is not > > doing "age active anon". > ;> We can rename it if you have something in mind. i wonder if we can directly do: if (lru_gen_enabled()) lru_gen_age_node(pgdat, sc); else age_active_anon(); rather than: /* * Do some background aging of the anon list, to give * pages a chance to be referenced before reclaiming. All * pages are rotated regardless of classzone as this is * about consistent aging. */ age_active_anon() { if (lru_gen_enabled()) return lru_gen_age_node(pgdat, sc); } the comment above makes no sense to lru_gen_age_node(pgdat, sc); another way is that we can add a wrapper for them as below, age_node() { if (lru_gen_enabled()) return lru_gen_age_node(pgdat, sc); age_active_anon(); } Thanks Barry _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-04-15 10:26 UTC|newest] Thread overview: 198+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-07 3:15 [PATCH v10 00/14] Multi-Gen LRU Framework Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 01/14] mm: x86, arm64: add arch_has_hw_pte_young() Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 02/14] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 03/14] mm/vmscan.c: refactor shrink_node() Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-16 6:48 ` Miaohe Lin 2022-04-16 6:48 ` Miaohe Lin 2022-04-07 3:15 ` [PATCH v10 04/14] Revert "include/linux/mm_inline.h: fold __update_lru_size() into its sole caller" Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-16 6:50 ` Miaohe Lin 2022-04-16 6:50 ` Miaohe Lin 2022-04-07 3:15 ` [PATCH v10 05/14] mm: multi-gen LRU: groundwork Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-12 7:06 ` Peter Zijlstra 2022-04-12 7:06 ` Peter Zijlstra 2022-04-20 0:39 ` Yu Zhao 2022-04-20 0:39 ` Yu Zhao 2022-04-20 20:07 ` Linus Torvalds 2022-04-20 20:07 ` Linus Torvalds 2022-04-26 22:39 ` Yu Zhao 2022-04-26 22:39 ` Yu Zhao 2022-04-26 23:42 ` Andrew Morton 2022-04-26 23:42 ` Andrew Morton 2022-04-27 1:18 ` Yu Zhao 2022-04-27 1:18 ` Yu Zhao 2022-04-27 1:34 ` Andrew Morton 2022-04-27 1:34 ` Andrew Morton 2022-04-07 3:15 ` [PATCH v10 06/14] mm: multi-gen LRU: minimal implementation Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-14 6:03 ` Barry Song 2022-04-14 6:03 ` Barry Song 2022-04-14 20:36 ` Yu Zhao 2022-04-14 20:36 ` Yu Zhao 2022-04-14 21:39 ` Andrew Morton 2022-04-14 21:39 ` Andrew Morton 2022-04-14 22:14 ` Yu Zhao 2022-04-14 22:14 ` Yu Zhao 2022-04-15 10:15 ` Barry Song 2022-04-15 10:15 ` Barry Song 2022-04-15 20:17 ` Yu Zhao 2022-04-15 20:17 ` Yu Zhao 2022-04-15 10:26 ` Barry Song [this message] 2022-04-15 10:26 ` Barry Song 2022-04-15 20:18 ` Yu Zhao 2022-04-15 20:18 ` Yu Zhao 2022-04-14 11:47 ` Chen Wandun 2022-04-14 11:47 ` Chen Wandun 2022-04-14 20:53 ` Yu Zhao 2022-04-14 20:53 ` Yu Zhao 2022-04-15 2:23 ` Chen Wandun 2022-04-15 2:23 ` Chen Wandun 2022-04-15 5:25 ` Yu Zhao 2022-04-15 5:25 ` Yu Zhao 2022-04-15 6:31 ` Chen Wandun 2022-04-15 6:31 ` Chen Wandun 2022-04-15 6:44 ` Yu Zhao 2022-04-15 6:44 ` Yu Zhao 2022-04-15 9:27 ` Chen Wandun 2022-04-15 9:27 ` Chen Wandun 2022-04-18 9:58 ` Barry Song 2022-04-18 9:58 ` Barry Song 2022-04-19 0:53 ` Yu Zhao 2022-04-19 0:53 ` Yu Zhao 2022-04-19 4:25 ` Barry Song 2022-04-19 4:25 ` Barry Song 2022-04-19 4:36 ` Barry Song 2022-04-19 4:36 ` Barry Song 2022-04-19 22:25 ` Yu Zhao 2022-04-19 22:25 ` Yu Zhao 2022-04-19 22:20 ` Yu Zhao 2022-04-19 22:20 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 07/14] mm: multi-gen LRU: exploit locality in rmap Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-27 4:32 ` Aneesh Kumar K.V 2022-04-27 4:32 ` Aneesh Kumar K.V 2022-04-27 4:38 ` Yu Zhao 2022-04-27 4:38 ` Yu Zhao 2022-04-27 5:31 ` Aneesh Kumar K V 2022-04-27 5:31 ` Aneesh Kumar K V 2022-04-27 6:00 ` Yu Zhao 2022-04-27 6:00 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 08/14] mm: multi-gen LRU: support page table walks Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-12 7:10 ` Peter Zijlstra 2022-04-12 7:10 ` Peter Zijlstra 2022-04-15 5:30 ` Yu Zhao 2022-04-15 5:30 ` Yu Zhao 2022-04-15 1:14 ` Yu Zhao 2022-04-15 1:14 ` Yu Zhao 2022-04-15 1:56 ` Andrew Morton 2022-04-15 1:56 ` Andrew Morton 2022-04-15 6:25 ` Yu Zhao 2022-04-15 6:25 ` Yu Zhao 2022-04-15 19:15 ` Andrew Morton 2022-04-15 19:15 ` Andrew Morton 2022-04-15 20:11 ` Yu Zhao 2022-04-15 20:11 ` Yu Zhao 2022-04-15 21:32 ` Andrew Morton 2022-04-15 21:32 ` Andrew Morton 2022-04-15 21:36 ` Linus Torvalds 2022-04-15 21:36 ` Linus Torvalds 2022-04-15 22:57 ` Yu Zhao 2022-04-15 22:57 ` Yu Zhao 2022-04-15 23:03 ` Linus Torvalds 2022-04-15 23:03 ` Linus Torvalds 2022-04-15 23:24 ` [page-reclaim] " Jesse Barnes 2022-04-15 23:24 ` Jesse Barnes 2022-04-15 23:31 ` Matthew Wilcox 2022-04-15 23:31 ` Matthew Wilcox 2022-04-15 23:37 ` Jesse Barnes 2022-04-15 23:37 ` Jesse Barnes 2022-04-15 23:49 ` Yu Zhao 2022-04-15 23:49 ` Yu Zhao 2022-04-16 16:32 ` Justin Forbes 2022-04-16 16:32 ` Justin Forbes 2022-04-19 22:32 ` Yu Zhao 2022-04-19 22:32 ` Yu Zhao 2022-04-29 14:10 ` zhong jiang 2022-04-29 14:10 ` zhong jiang 2022-04-30 8:34 ` Yu Zhao 2022-04-30 8:34 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 09/14] mm: multi-gen LRU: optimize multiple memcgs Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 10/14] mm: multi-gen LRU: kill switch Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-26 20:57 ` Yu Zhao 2022-04-26 20:57 ` Yu Zhao 2022-04-26 22:22 ` Andrew Morton 2022-04-26 22:22 ` Andrew Morton 2022-04-27 1:11 ` Yu Zhao 2022-04-27 1:11 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 11/14] mm: multi-gen LRU: thrashing prevention Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 12/14] mm: multi-gen LRU: debugfs interface Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-16 0:03 ` Yu Zhao 2022-04-16 0:03 ` Yu Zhao 2022-04-16 4:20 ` Andrew Morton 2022-04-16 4:20 ` Andrew Morton 2022-04-26 6:59 ` Yu Zhao 2022-04-26 6:59 ` Yu Zhao 2022-04-26 21:30 ` Andrew Morton 2022-04-26 21:30 ` Andrew Morton 2022-04-26 22:15 ` Yu Zhao 2022-04-26 22:15 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 13/14] mm: multi-gen LRU: admin guide Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 12:41 ` Bagas Sanjaya 2022-04-07 12:41 ` Bagas Sanjaya 2022-04-07 12:51 ` Jonathan Corbet 2022-04-07 12:51 ` Jonathan Corbet 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-16 2:22 ` Yu Zhao 2022-04-16 2:22 ` Yu Zhao 2022-04-07 3:15 ` [PATCH v10 14/14] mm: multi-gen LRU: design doc Yu Zhao 2022-04-07 3:15 ` Yu Zhao 2022-04-07 11:39 ` Huang Shijie 2022-04-07 11:39 ` Huang Shijie 2022-04-07 12:41 ` Bagas Sanjaya 2022-04-07 12:41 ` Bagas Sanjaya 2022-04-07 12:52 ` Jonathan Corbet 2022-04-07 12:52 ` Jonathan Corbet 2022-04-08 4:48 ` Bagas Sanjaya 2022-04-08 4:48 ` Bagas Sanjaya 2022-04-12 2:16 ` Andrew Morton 2022-04-12 2:16 ` Andrew Morton 2022-04-26 7:42 ` Yu Zhao 2022-04-26 7:42 ` Yu Zhao 2022-04-07 3:24 ` [PATCH v10 00/14] Multi-Gen LRU Framework Yu Zhao 2022-04-07 3:24 ` Yu Zhao 2022-04-07 8:31 ` Stephen Rothwell 2022-04-07 8:31 ` Stephen Rothwell 2022-04-07 9:08 ` Yu Zhao 2022-04-07 9:08 ` Yu Zhao 2022-04-07 9:41 ` Yu Zhao 2022-04-07 9:41 ` Yu Zhao 2022-04-07 12:13 ` Stephen Rothwell 2022-04-07 12:13 ` Stephen Rothwell 2022-04-08 2:08 ` Yu Zhao 2022-04-08 2:08 ` Yu Zhao 2022-04-12 2:15 ` Andrew Morton 2022-04-12 2:15 ` Andrew Morton 2022-04-14 5:06 ` Andrew Morton 2022-04-14 5:06 ` Andrew Morton 2022-04-20 0:50 ` Yu Zhao 2022-04-20 0:50 ` Yu Zhao
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