From: Michal Hocko <mhocko@suse.com>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: akpm@linux-foundation.org, hannes@cmpxchg.org, vbabka@suse.cz,
axboe@kernel.dk, iamjoonsoo.kim@lge.com, alexs@kernel.org,
apopple@nvidia.com, willy@infradead.org, minchan@kernel.org,
david@redhat.com, shli@fb.com, hillf.zj@alibaba-inc.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] mm/vmscan: fix misleading comment in isolate_lru_pages()
Date: Mon, 12 Jul 2021 09:28:21 +0200 [thread overview]
Message-ID: <YOvvFaYMBhISeGEI@dhcp22.suse.cz> (raw)
In-Reply-To: <20210710100329.49174-6-linmiaohe@huawei.com>
On Sat 10-07-21 18:03:29, Miaohe Lin wrote:
> We couldn't know whether the page is being freed elsewhere until we failed
> to increase the page count.
This is moving a hard to understand comment from one place to another.
If anything this would benefit from what that elsewhere might be
typically or simply drop the comment altogether.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> mm/vmscan.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index a74760c48bd8..6e26b3c93242 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1891,7 +1891,6 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> */
> scan += nr_pages;
> if (!__isolate_lru_page_prepare(page, mode)) {
> - /* It is being freed elsewhere */
> list_move(&page->lru, src);
> continue;
> }
> @@ -1901,6 +1900,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> * page release code relies on it.
> */
> if (unlikely(!get_page_unless_zero(page))) {
> + /* It is being freed elsewhere. */
> list_move(&page->lru, src);
> continue;
> }
> --
> 2.23.0
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-07-12 8:09 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-10 10:03 [PATCH 0/5] Cleanup and fixup for vmscan Miaohe Lin
2021-07-10 10:03 ` [PATCH 1/5] mm/vmscan: put the redirtied MADV_FREE pages back to anonymous LRU list Miaohe Lin
2021-07-10 23:22 ` Yu Zhao
2021-07-12 7:11 ` Miaohe Lin
2021-07-13 7:25 ` Yu Zhao
2021-07-13 13:16 ` Miaohe Lin
2021-07-12 7:22 ` Michal Hocko
2021-07-12 11:03 ` Miaohe Lin
2021-07-13 9:30 ` Michal Hocko
2021-07-13 13:13 ` Miaohe Lin
2021-07-13 13:34 ` Matthew Wilcox
2021-07-14 11:36 ` Miaohe Lin
2021-07-14 11:48 ` Matthew Wilcox
2021-07-14 19:43 ` John Hubbard
2021-07-15 11:30 ` Miaohe Lin
2021-07-16 0:01 ` John Hubbard
2021-07-16 1:53 ` Miaohe Lin
2021-07-10 10:03 ` [PATCH 2/5] mm/vmscan: remove misleading setting to sc->priority Miaohe Lin
2021-07-12 7:24 ` Michal Hocko
2021-07-12 11:10 ` Miaohe Lin
2021-07-10 10:03 ` [PATCH 3/5] mm/vmscan: remove unneeded return value of kswapd_run() Miaohe Lin
2021-07-12 7:25 ` Michal Hocko
2021-07-10 10:03 ` [PATCH 4/5] mm/vmscan: add 'else' to remove check_pending label Miaohe Lin
2021-07-12 7:26 ` Michal Hocko
2021-07-10 10:03 ` [PATCH 5/5] mm/vmscan: fix misleading comment in isolate_lru_pages() Miaohe Lin
2021-07-12 7:28 ` Michal Hocko [this message]
2021-07-12 11:16 ` Miaohe Lin
2021-07-13 9:32 ` Michal Hocko
2021-07-13 12:50 ` Miaohe Lin
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