linux-kernel - [PATCH v10 13/15] mm/vmscan: use relock for move_pages_to

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Message-Id: <1587970985-21629-15-git-send-email-alex.shi@linux.alibaba.com>
Date:   Mon, 27 Apr 2020 15:03:03 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, yang.shi@...ux.alibaba.com,
        willy@...radead.org, hannes@...xchg.org, lkp@...el.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, shakeelb@...gle.com,
        iamjoonsoo.kim@....com, richard.weiyang@...il.com
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Jann Horn <jannh@...gle.com>
Subject: [PATCH v10 13/15] mm/vmscan: use relock for move_pages_to_lru

From: Hugh Dickins <hughd@...gle.com>

Use the relock function to replace relocking action. And try to save few
lock times.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Jann Horn <jannh@...gle.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: cgroups@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
---
 mm/vmscan.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6dd3e1be5bbb..52d8a35fdf6a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1836,15 +1836,15 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 	enum lru_list lru;
 
 	while (!list_empty(list)) {
-		struct lruvec *new_lruvec = NULL;
-
 		page = lru_to_page(list);
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 		list_del(&page->lru);
 		if (unlikely(!page_evictable(page))) {
-			spin_unlock_irq(&lruvec->lru_lock);
+			if (lruvec) {
+				spin_unlock_irq(&lruvec->lru_lock);
+				lruvec = NULL;
+			}
 			putback_lru_page(page);
-			spin_lock_irq(&lruvec->lru_lock);
 			continue;
 		}
 
@@ -1858,12 +1858,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 		 *                                        list_add(&page->lru,)
 		 *     list_add(&page->lru,) //corrupt
 		 */
-		new_lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
-		if (new_lruvec != lruvec) {
-			if (lruvec)
-				spin_unlock_irq(&lruvec->lru_lock);
-			lruvec = lock_page_lruvec_irq(page);
-		}
+		lruvec = relock_page_lruvec_irq(page, lruvec);
 		SetPageLRU(page);
 
 		if (unlikely(put_page_testzero(page))) {
@@ -1872,8 +1867,8 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 
 			if (unlikely(PageCompound(page))) {
 				spin_unlock_irq(&lruvec->lru_lock);
+				lruvec = NULL;
 				(*get_compound_page_dtor(page))(page);
-				spin_lock_irq(&lruvec->lru_lock);
 			} else
 				list_add(&page->lru, &pages_to_free);
 			continue;
@@ -1891,7 +1886,6 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 		spin_lock_irq(&orig_lruvec->lru_lock);
 	}
 
-
 	/*
 	 * To save our caller's stack, now use input list for pages to free.
 	 */
-- 
1.8.3.1