From: Hugh Dickins <hughd@google.com>
To: Alex Shi <alex.shi@linux.alibaba.com>
Cc: 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
Subject: Re: [PATCH v18 15/32] mm/lru: move lock into lru_note_cost
Date: Mon, 21 Sep 2020 15:03:24 -0700 (PDT) [thread overview]
Message-ID: <alpine.LSU.2.11.2009211440570.5214@eggly.anvils> (raw)
In-Reply-To: <alpine.LSU.2.11.2009211434490.5214@eggly.anvils>
On Mon, 21 Sep 2020, Hugh Dickins wrote:
> On Mon, 24 Aug 2020, Alex Shi wrote:
>
> > We have to move lru_lock into lru_note_cost, since it cycle up on memcg
> > tree, for future per lruvec lru_lock replace. It's a bit ugly and may
> > cost a bit more locking, but benefit from multiple memcg locking could
> > cover the lost.
> >
> > Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
>
> Acked-by: Hugh Dickins <hughd@google.com>
>
> In your lruv19 github tree, you have merged 14/32 into this one: thanks.
Grr, I've only just started, and already missed some of my notes.
I wanted to point out that this patch does introduce an extra unlock+lock
in shrink_inactive_list(), even in a !CONFIG_MEMCG build. I think you've
done the right thing for now, keeping it simple, and maybe nobody will
notice the extra overhead; but I expect us to replace lru_note_cost()
by lru_note_cost_unlock_irq() later on, expecting the caller to do the
initial lock_irq().
lru_note_cost_page() looks redundant to me, but you're right not to
delete it here, unless Johannes asks you to add that in: that's his
business, and it may be dependent on the XXX at its callsite.
>
> > Cc: Johannes Weiner <hannes@cmpxchg.org>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: linux-mm@kvack.org
> > Cc: linux-kernel@vger.kernel.org
> > ---
> > mm/swap.c | 5 +++--
> > mm/vmscan.c | 4 +---
> > 2 files changed, 4 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/swap.c b/mm/swap.c
> > index 906255db6006..f80ccd6f3cb4 100644
> > --- a/mm/swap.c
> > +++ b/mm/swap.c
> > @@ -269,7 +269,9 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
> > {
> > do {
> > unsigned long lrusize;
> > + struct pglist_data *pgdat = lruvec_pgdat(lruvec);
> >
> > + spin_lock_irq(&pgdat->lru_lock);
> > /* Record cost event */
> > if (file)
> > lruvec->file_cost += nr_pages;
> > @@ -293,15 +295,14 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
> > lruvec->file_cost /= 2;
> > lruvec->anon_cost /= 2;
> > }
> > + spin_unlock_irq(&pgdat->lru_lock);
> > } while ((lruvec = parent_lruvec(lruvec)));
> > }
> >
> > void lru_note_cost_page(struct page *page)
> > {
> > - spin_lock_irq(&page_pgdat(page)->lru_lock);
> > lru_note_cost(mem_cgroup_page_lruvec(page, page_pgdat(page)),
> > page_is_file_lru(page), thp_nr_pages(page));
> > - spin_unlock_irq(&page_pgdat(page)->lru_lock);
> > }
> >
> > static void __activate_page(struct page *page, struct lruvec *lruvec)
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index ffccb94defaf..7b7b36bd1448 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -1971,19 +1971,17 @@ static int current_may_throttle(void)
> > &stat, false);
> >
> > spin_lock_irq(&pgdat->lru_lock);
> > -
> > move_pages_to_lru(lruvec, &page_list);
> >
> > __mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
> > - lru_note_cost(lruvec, file, stat.nr_pageout);
> > item = current_is_kswapd() ? PGSTEAL_KSWAPD : PGSTEAL_DIRECT;
> > if (!cgroup_reclaim(sc))
> > __count_vm_events(item, nr_reclaimed);
> > __count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
> > __count_vm_events(PGSTEAL_ANON + file, nr_reclaimed);
> > -
> > spin_unlock_irq(&pgdat->lru_lock);
> >
> > + lru_note_cost(lruvec, file, stat.nr_pageout);
> > mem_cgroup_uncharge_list(&page_list);
> > free_unref_page_list(&page_list);
> >
> > --
> > 1.8.3.1
> >
> >
>
next prev parent reply other threads:[~2020-09-21 22:03 UTC|newest]
Thread overview: 102+ 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 ` [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 ` [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 ` [PATCH v18 06/32] mm/thp: narrow lru locking Alex Shi
2020-09-10 13:49 ` Matthew Wilcox
2020-09-11 3:37 ` Alex Shi
2020-09-13 15:27 ` Matthew Wilcox
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 ` [PATCH v18 08/32] mm/vmscan: remove unnecessary lruvec adding 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 ` [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 ` [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 22:03 ` Hugh Dickins [this message]
2020-09-22 3:39 ` Alex Shi
2020-09-22 3:38 ` Alex Shi
2020-08-24 12:54 ` [PATCH v18 16/32] mm/lru: introduce TestClearPageLRU Alex Shi
2020-09-21 23:16 ` Hugh Dickins
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
2020-09-22 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 ` [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 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 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
2020-08-24 12:54 ` [PATCH v18 22/32] mm/vmscan: use relock for move_pages_to_lru Alex Shi
2020-09-22 5:44 ` Hugh Dickins
2020-09-23 1:55 ` Alex Shi
2020-08-24 12:54 ` [PATCH v18 23/32] mm/lru: revise the comments of lru_lock Alex Shi
2020-09-22 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
2020-09-23 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
2020-08-26 5:52 ` Alex Shi
2020-09-22 6:13 ` Hugh Dickins
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 12:55 ` [PATCH v18 27/32] mm/swap.c: optimizing __pagevec_lru_add lru_lock 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 ` [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
2020-09-09 1:01 ` Matthew Wilcox
2020-09-09 15:43 ` Alexander Duyck
2020-09-09 17:07 ` Matthew Wilcox
2020-09-09 18:24 ` Hugh Dickins
2020-09-09 20:15 ` Matthew Wilcox
2020-09-09 21:05 ` Hugh Dickins
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 18:42 ` [PATCH v18 00/32] per memcg lru_lock Andrew Morton
2020-08-24 19:50 ` Qian Cai
2020-08-24 20:24 ` Hugh Dickins
2020-08-25 1:56 ` Daniel Jordan
2020-08-25 3:26 ` Alex Shi
2020-08-25 11:39 ` Matthew Wilcox
2020-08-26 1:19 ` Daniel Jordan
2020-08-26 8:59 ` Alex Shi
2020-08-28 1:40 ` Daniel Jordan
2020-08-28 5:22 ` Alex Shi
2020-09-09 2:44 ` Aaron Lu
2020-09-09 11:40 ` Michal Hocko
2020-08-25 8:52 ` Alex Shi
2020-08-25 13:00 ` Alex Shi
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
2020-09-09 2:24 ` Wei Yang
2020-09-09 15:08 ` Alex Shi
2020-09-09 23:16 ` Hugh Dickins
2020-09-11 2:50 ` Alex Shi
2020-09-12 2:13 ` Hugh Dickins
2020-09-13 14:21 ` Alex Shi
2020-09-15 8:21 ` Hugh Dickins
2020-09-15 16:58 ` Daniel Jordan
2020-09-17 2:37 ` Alex Shi
2020-09-17 14:35 ` Daniel Jordan
2020-09-17 15:39 ` Alexander Duyck
2020-09-17 16:48 ` Daniel Jordan
2020-09-12 8:38 ` Hugh Dickins
2020-09-13 14:22 ` Alex Shi
2020-09-09 16:11 ` Alexander Duyck
2020-09-10 0:32 ` Hugh Dickins
2020-09-10 14:24 ` Alexander Duyck
2020-09-12 5:12 ` Hugh Dickins
2020-08-25 7:21 ` [PATCH v18 00/32] per memcg lru_lock Michal Hocko
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