linux-kernel - [PATCH v2 7/8] mm/lru: likely enhancement

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Message-Id: <1573567588-47048-8-git-send-email-alex.shi@linux.alibaba.com>
Date:   Tue, 12 Nov 2019 22:06:27 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     alex.shi@...ux.alibaba.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        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
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Chris Down <chris@...isdown.name>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 7/8] mm/lru: likely enhancement

Use likely() to remove speculations according to pagevec usage mode.

Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Roman Gushchin <guro@...com>
Cc: Shakeel Butt <shakeelb@...gle.com>
Cc: Chris Down <chris@...isdown.name>
Cc: Tejun Heo <tj@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Cc: cgroups@...r.kernel.org
Cc: linux-mm@...ck.org
---
 include/linux/memcontrol.h | 8 ++++----
 mm/memcontrol.c            | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index f869897a68f0..2a6d7a503452 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1307,12 +1307,12 @@ static inline struct lruvec *relock_page_lruvec_irq(struct page *page,
 	struct pglist_data *pgdat = page_pgdat(page);
 	struct lruvec *lruvec;
 
-	if (!locked_lruvec)
+	if (unlikely(!locked_lruvec))
 		goto lock;
 
 	lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
-	if (locked_lruvec == lruvec)
+	if (likely(locked_lruvec == lruvec))
 		return lruvec;
 
 	spin_unlock_irq(&locked_lruvec->lru_lock);
@@ -1329,12 +1329,12 @@ static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page,
 	struct pglist_data *pgdat = page_pgdat(page);
 	struct lruvec *lruvec;
 
-	if (!locked_lruvec)
+	if (unlikely(!locked_lruvec))
 		goto lock;
 
 	lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
-	if (locked_lruvec == lruvec)
+	if (likely(locked_lruvec == lruvec))
 		return lruvec;
 
 	spin_unlock_irqrestore(&locked_lruvec->lru_lock, locked_lruvec->flags);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d2539bac4677..d95adf49fae3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1273,7 +1273,7 @@ struct lruvec *lock_page_lruvec_irq(struct page *page,
 	spin_lock_irq(&lruvec->lru_lock);
 
 	/* lruvec may changed in commit_charge() */
-	if (lruvec != mem_cgroup_page_lruvec(page, pgdat)) {
+	if (unlikely(lruvec != mem_cgroup_page_lruvec(page, pgdat))) {
 		spin_unlock_irq(&lruvec->lru_lock);
 		goto again;
 	}
@@ -1291,7 +1291,7 @@ struct lruvec *lock_page_lruvec_irqsave(struct page *page,
 	spin_lock_irqsave(&lruvec->lru_lock, lruvec->flags);
 
 	/* lruvec may changed in commit_charge() */
-	if (lruvec != mem_cgroup_page_lruvec(page, pgdat)) {
+	if (unlikely(lruvec != mem_cgroup_page_lruvec(page, pgdat))) {
 		spin_unlock_irqrestore(&lruvec->lru_lock, lruvec->flags);
 		goto again;
 	}
-- 
1.8.3.1