From: Oscar Salvador <osalvador@suse.de>
To: Huang Ying <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Zi Yan <ziy@nvidia.com>, Yang Shi <shy828301@gmail.com>
Subject: Re: [PATCH -V2 3/7] migrate_pages(): fix THP failure counting for -ENOMEM
Date: Mon, 11 Jul 2022 14:01:55 +0200 [thread overview]
Message-ID: <YswRMxPWz2juorft@localhost.localdomain> (raw)
In-Reply-To: <20220711084948.274787-4-ying.huang@intel.com>
On Mon, Jul 11, 2022 at 04:49:44PM +0800, Huang Ying wrote:
> In unmap_and_move(), if the new THP cannot be allocated, -ENOMEM will
> be returned, and migrate_pages() will try to split the THP unless
> "reason" is MR_NUMA_MISPLACED (that is, nosplit == true). But when
> nosplit == true, the THP migration failure will not be counted. This
> is incorrect. So in this patch, the THP migration failure will be
> counted for -ENOMEM regardless of nosplit is true or false. The
> nr_failed counting isn't fixed because it's not used. Added some
> comments for it per Baolin's suggestion.
>
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> Cc: Zi Yan <ziy@nvidia.com>
> Cc: Yang Shi <shy828301@gmail.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
> ---
> mm/migrate.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 794312072eb3..38e2c789a9c3 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1426,11 +1426,11 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> /*
> * When memory is low, don't bother to try to migrate
> * other pages, just exit.
> - * THP NUMA faulting doesn't split THP to retry.
> */
> - if (is_thp && !nosplit) {
> + if (is_thp) {
> nr_thp_failed++;
> - if (!try_split_thp(page, &thp_split_pages)) {
> + /* THP NUMA faulting doesn't split THP to retry. */
> + if (!nosplit && !try_split_thp(page, &thp_split_pages)) {
> nr_thp_split++;
> goto retry;
> }
> @@ -1446,6 +1446,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> * the caller otherwise the page refcnt will be leaked.
> */
> list_splice_init(&thp_split_pages, from);
> + /* nr_failed isn't updated for not used */
> nr_thp_failed += thp_retry;
> goto out;
> case -EAGAIN:
> --
> 2.30.2
>
>
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2022-07-11 12:01 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-11 8:49 [PATCH -V2 0/7] migrate_pages(): fix several bugs in error path Huang Ying
2022-07-11 8:49 ` [PATCH -V2 1/7] migrate: fix syscall move_pages() return value for failure Huang Ying
2022-07-11 11:52 ` Oscar Salvador
2022-07-12 0:59 ` Huang, Ying
2022-07-11 8:49 ` [PATCH -V2 2/7] migrate_pages(): remove unnecessary list_safe_reset_next() Huang Ying
2022-07-11 11:57 ` Oscar Salvador
2022-07-11 8:49 ` [PATCH -V2 3/7] migrate_pages(): fix THP failure counting for -ENOMEM Huang Ying
2022-07-11 12:01 ` Oscar Salvador [this message]
2022-07-11 8:49 ` [PATCH -V2 4/7] migrate_pages(): fix failure counting for THP subpages retrying Huang Ying
2022-07-11 12:13 ` Oscar Salvador
2022-07-11 8:49 ` [PATCH -V2 5/7] migrate_pages(): fix failure counting for THP on -ENOSYS Huang Ying
2022-07-11 12:26 ` Oscar Salvador
2022-07-13 8:30 ` Huang, Ying
2022-07-11 8:49 ` [PATCH -V2 6/7] migrate_pages(): fix failure counting for THP splitting Huang Ying
2022-07-11 12:39 ` Oscar Salvador
2022-07-11 8:49 ` [PATCH -V2 7/7] migrate_pages(): fix failure counting for retry Huang Ying
2022-07-11 12:52 ` Oscar Salvador
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