From: Oscar Salvador <osalvador@suse.de>
To: Muchun Song <songmuchun@bytedance.com>
Cc: mike.kravetz@oracle.com, akpm@linux-foundation.org,
n-horiguchi@ah.jp.nec.com, ak@linux.intel.com, mhocko@suse.cz,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Yang Shi <shy828301@gmail.com>, Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v4 1/6] mm: migrate: do not migrate HugeTLB page whose refcount is one
Date: Wed, 13 Jan 2021 11:57:01 +0100 [thread overview]
Message-ID: <20210113105657.GA26599@linux> (raw)
In-Reply-To: <20210113052209.75531-2-songmuchun@bytedance.com>
On Wed, Jan 13, 2021 at 01:22:04PM +0800, Muchun Song wrote:
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 4385f2fb5d18..a6631c4eb6a6 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1279,6 +1279,12 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
> return -ENOSYS;
> }
>
> + if (page_count(hpage) == 1) {
> + /* page was freed from under us. So we are done. */
> + putback_active_hugepage(hpage);
> + return MIGRATEPAGE_SUCCESS;
> + }
> +
I was a bit puzzled as why we did not go to the "goto" block that already does
this, but then I saw the put_new_page/new_hpage handlind further down.
It could be re-arranged but out of scope, so:
Reviewed-by: Oscar Salvador <osalvador@suse.de>
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2021-01-13 10:58 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-13 5:22 [PATCH v4 0/6] Fix some bugs about HugeTLB code Muchun Song
2021-01-13 5:22 ` [PATCH v4 1/6] mm: migrate: do not migrate HugeTLB page whose refcount is one Muchun Song
2021-01-13 10:30 ` David Hildenbrand
2021-01-13 10:57 ` Oscar Salvador [this message]
2021-01-13 11:03 ` [External] " Muchun Song
2021-01-13 5:22 ` [PATCH v4 2/6] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Muchun Song
2021-01-13 11:00 ` Oscar Salvador
2021-01-13 5:22 ` [PATCH v4 3/6] mm: hugetlb: fix a race between freeing and dissolving the page Muchun Song
2021-01-13 9:31 ` Michal Hocko
2021-01-13 5:22 ` [PATCH v4 4/6] mm: hugetlb: retry dissolve page when hitting race Muchun Song
2021-01-13 9:33 ` Michal Hocko
2021-01-13 10:14 ` [External] " Muchun Song
2021-01-13 10:38 ` Michal Hocko
2021-01-13 11:11 ` Muchun Song
2021-01-13 11:14 ` Oscar Salvador
2021-01-13 11:20 ` Muchun Song
2021-01-13 12:03 ` Michal Hocko
2021-01-13 11:22 ` Michal Hocko
2021-01-13 12:15 ` Muchun Song
2021-01-13 5:22 ` [PATCH v4 5/6] mm: hugetlb: fix a race between isolating and freeing page Muchun Song
2021-01-13 5:22 ` [PATCH v4 6/6] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active Muchun Song
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