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,
aaron.lwe@gmail.com
Subject: Re: [PATCH v19 07/20] mm/vmscan: remove unnecessary lruvec adding
Date: Sat, 26 Sep 2020 14:14:56 +0800 [thread overview]
Message-ID: <30c65309-df19-b83b-5879-cce860ce55ef@linux.alibaba.com> (raw)
In-Reply-To: <1600918115-22007-8-git-send-email-alex.shi@linux.alibaba.com>
This patch has some conflict on akpm. But since Yu Zhao ask for
revert his patch 'mm: use add_page_to_lru_list()/page_lru()/page_off_lru()'
we should not needs for rebase on it.
Thanks
Alex
在 2020/9/24 上午11:28, Alex Shi 写道:
> We don't have to add a freeable page into lru and then remove from it.
> This change saves a couple of actions and makes the moving more clear.
>
> The SetPageLRU needs to be kept before put_page_testzero for list
> integrity, otherwise:
>
> #0 move_pages_to_lru #1 release_pages
> if !put_page_testzero
> if (put_page_testzero())
> !PageLRU //skip lru_lock
> SetPageLRU()
> list_add(&page->lru,)
> list_add(&page->lru,)
>
> [akpm@linux-foundation.org: coding style fixes]
> Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
> Acked-by: Hugh Dickins <hughd@google.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.kernel.org
> ---
> mm/vmscan.c | 38 +++++++++++++++++++++++++-------------
> 1 file changed, 25 insertions(+), 13 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 466fc3144fff..32102e5d354d 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1850,26 +1850,30 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
> while (!list_empty(list)) {
> page = lru_to_page(list);
> VM_BUG_ON_PAGE(PageLRU(page), page);
> + list_del(&page->lru);
> if (unlikely(!page_evictable(page))) {
> - list_del(&page->lru);
> spin_unlock_irq(&pgdat->lru_lock);
> putback_lru_page(page);
> spin_lock_irq(&pgdat->lru_lock);
> continue;
> }
> - lruvec = mem_cgroup_page_lruvec(page, pgdat);
>
> + /*
> + * The SetPageLRU needs to be kept here for list integrity.
> + * Otherwise:
> + * #0 move_pages_to_lru #1 release_pages
> + * if !put_page_testzero
> + * if (put_page_testzero())
> + * !PageLRU //skip lru_lock
> + * SetPageLRU()
> + * list_add(&page->lru,)
> + * list_add(&page->lru,)
> + */
> SetPageLRU(page);
> - lru = page_lru(page);
>
> - nr_pages = thp_nr_pages(page);
> - update_lru_size(lruvec, lru, page_zonenum(page), nr_pages);
> - list_move(&page->lru, &lruvec->lists[lru]);
> -
> - if (put_page_testzero(page)) {
> + if (unlikely(put_page_testzero(page))) {
> __ClearPageLRU(page);
> __ClearPageActive(page);
> - del_page_from_lru_list(page, lruvec, lru);
>
> if (unlikely(PageCompound(page))) {
> spin_unlock_irq(&pgdat->lru_lock);
> @@ -1877,11 +1881,19 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
> spin_lock_irq(&pgdat->lru_lock);
> } else
> list_add(&page->lru, &pages_to_free);
> - } else {
> - nr_moved += nr_pages;
> - if (PageActive(page))
> - workingset_age_nonresident(lruvec, nr_pages);
> +
> + continue;
> }
> +
> + lruvec = mem_cgroup_page_lruvec(page, pgdat);
> + lru = page_lru(page);
> + nr_pages = thp_nr_pages(page);
> +
> + update_lru_size(lruvec, lru, page_zonenum(page), nr_pages);
> + list_add(&page->lru, &lruvec->lists[lru]);
> + nr_moved += nr_pages;
> + if (PageActive(page))
> + workingset_age_nonresident(lruvec, nr_pages);
> }
>
> /*
>
next prev parent reply other threads:[~2020-09-26 6:17 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 3:28 [PATCH v19 00/20] per memcg lru_lock Alex Shi
2020-09-24 3:28 ` [PATCH v19 01/20] mm/memcg: warning on !memcg after readahead page charged Alex Shi
2020-09-24 3:28 ` [PATCH v19 02/20] mm/memcg: bail early from swap accounting if memcg disabled Alex Shi
2020-09-24 3:28 ` [PATCH v19 03/20] mm/thp: move lru_add_page_tail func to huge_memory.c Alex Shi
2020-09-26 6:06 ` Alex Shi
2020-09-24 3:28 ` [PATCH v19 04/20] mm/thp: use head for head page in lru_add_page_tail Alex Shi
2020-09-24 3:28 ` [PATCH v19 05/20] mm/thp: Simplify lru_add_page_tail() Alex Shi
2020-09-24 3:28 ` [PATCH v19 06/20] mm/thp: narrow lru locking Alex Shi
2020-09-26 6:08 ` Alex Shi
2020-09-24 3:28 ` [PATCH v19 07/20] mm/vmscan: remove unnecessary lruvec adding Alex Shi
2020-09-26 6:14 ` Alex Shi [this message]
2020-09-24 3:28 ` [PATCH v19 08/20] mm: page_idle_get_page() does not need lru_lock Alex Shi
2020-09-24 3:28 ` [PATCH v19 09/20] mm/memcg: add debug checking in lock_page_memcg Alex Shi
2020-09-24 3:28 ` [PATCH v19 10/20] mm/swap.c: fold vm event PGROTATED into pagevec_move_tail_fn Alex Shi
2020-09-24 3:28 ` [PATCH v19 11/20] mm/lru: move lock into lru_note_cost Alex Shi
2020-09-24 3:28 ` [PATCH v19 12/20] mm/vmscan: remove lruvec reget in move_pages_to_lru Alex Shi
2020-09-24 3:28 ` [PATCH v19 13/20] mm/mlock: remove lru_lock on TestClearPageMlocked Alex Shi
2020-09-24 3:28 ` [PATCH v19 14/20] mm/mlock: remove __munlock_isolate_lru_page Alex Shi
2020-09-24 3:28 ` [PATCH v19 15/20] mm/lru: introduce TestClearPageLRU Alex Shi
2020-09-24 3:28 ` [PATCH v19 16/20] mm/compaction: do page isolation first in compaction Alex Shi
2020-09-24 3:28 ` [PATCH v19 17/20] mm/swap.c: serialize memcg changes in pagevec_lru_move_fn Alex Shi
2020-09-24 3:28 ` [PATCH v19 18/20] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2020-10-21 7:23 ` Alex Shi
2020-10-23 2:00 ` Rong Chen
2020-10-25 21:51 ` Hugh Dickins
2020-10-26 1:41 ` Alex Shi
2020-10-27 0:36 ` Rong Chen
2020-09-24 3:28 ` [PATCH v19 19/20] mm/lru: introduce the relock_page_lruvec function Alex Shi
2020-09-24 3:28 ` [PATCH v19 20/20] mm/lru: revise the comments of lru_lock Alex Shi
2020-09-24 18:06 ` [PATCH v19 00/20] per memcg lru_lock Daniel Jordan
2020-09-25 0:01 ` Alex Shi
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