From: Huang Ying <ying.huang@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Huang Ying <ying.huang@intel.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Zi Yan <ziy@nvidia.com>, Yang Shi <shy828301@gmail.com>
Subject: [PATCH 2/7] migrate_pages(): remove unnecessary list_safe_reset_next()
Date: Fri, 24 Jun 2022 10:53:04 +0800 [thread overview]
Message-ID: <20220624025309.1033400-3-ying.huang@intel.com> (raw)
In-Reply-To: <20220624025309.1033400-1-ying.huang@intel.com>
Before commit b5bade978e9b ("mm: migrate: fix the return value of
migrate_pages()"), the tail pages of THP will be put in the "from"
list directly. So one of the loop cursors (page2) needs to be reset,
as is done in try_split_thp() via list_safe_reset_next(). But after
the commit, the tail pages of THP will be put in a dedicated
list (thp_split_pages). That is, the "from" list will not be changed
during splitting. So, it's unnecessary to call list_safe_reset_next()
anymore.
This is a code cleanup, no functionality changes are expected.
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
---
mm/migrate.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index a271554be7a1..82444e7df9f1 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1300,16 +1300,13 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
return rc;
}
-static inline int try_split_thp(struct page *page, struct page **page2,
- struct list_head *from)
+static inline int try_split_thp(struct page *page, struct list_head *split_pages)
{
- int rc = 0;
+ int rc;
lock_page(page);
- rc = split_huge_page_to_list(page, from);
+ rc = split_huge_page_to_list(page, split_pages);
unlock_page(page);
- if (!rc)
- list_safe_reset_next(page, *page2, lru);
return rc;
}
@@ -1413,7 +1410,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
/* THP migration is unsupported */
if (is_thp) {
nr_thp_failed++;
- if (!try_split_thp(page, &page2, &thp_split_pages)) {
+ if (!try_split_thp(page, &thp_split_pages)) {
nr_thp_split++;
goto retry;
}
@@ -1432,7 +1429,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
*/
if (is_thp && !nosplit) {
nr_thp_failed++;
- if (!try_split_thp(page, &page2, &thp_split_pages)) {
+ if (!try_split_thp(page, &thp_split_pages)) {
nr_thp_split++;
goto retry;
}
--
2.30.2
next prev parent reply other threads:[~2022-06-24 2:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-24 2:53 [PATCH 0/7] migrate_pages(): fix several bugs in error path Huang Ying
2022-06-24 2:53 ` [PATCH 1/7] migrate: fix syscall move_pages() return value for failure Huang Ying
2022-06-24 2:53 ` Huang Ying [this message]
2022-06-24 9:22 ` [PATCH 2/7] migrate_pages(): remove unnecessary list_safe_reset_next() Baolin Wang
2022-06-24 2:53 ` [PATCH 3/7] migrate_pages(): fix THP failure counting for -ENOMEM Huang Ying
2022-06-24 9:36 ` Baolin Wang
2022-06-24 2:53 ` [PATCH 4/7] migrate_pages(): fix failure counting for THP subpages retrying Huang Ying
2022-06-24 9:45 ` Baolin Wang
2022-06-27 1:46 ` Huang, Ying
2022-06-27 3:59 ` Baolin Wang
2022-06-27 4:23 ` Huang, Ying
2022-06-27 5:56 ` Baolin Wang
2022-06-24 2:53 ` [PATCH 5/7] migrate_pages(): fix failure counting for THP on -ENOSYS Huang Ying
2022-06-24 9:51 ` Baolin Wang
2022-06-24 10:11 ` [PATCH 0/7] migrate_pages(): fix several bugs in error path Baolin Wang
2022-06-27 2:30 ` Huang, Ying
2022-06-27 2:24 ` [PATCH 6/7] migrate_pages(): fix failure counting for THP splitting Huang Ying
2022-06-27 4:24 ` Baolin Wang
2022-06-27 2:25 ` [PATCH 7/7] migrate_pages(): fix failure counting for retry Huang Ying
2022-06-27 4:29 ` Baolin Wang
2022-06-27 6:21 ` Huang, Ying
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220624025309.1033400-3-ying.huang@intel.com \
--to=ying.huang@intel.com \
--cc=akpm@linux-foundation.org \
--cc=baolin.wang@linux.alibaba.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=shy828301@gmail.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).