linux-kernel - [RFC PATCH v2 5/5] kernel: futex: use HQ-spinlock for hash-buckets

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Message-ID: <20251206062106.2109014-6-stepanov.anatoly@huawei.com>
Date: Sat, 6 Dec 2025 14:21:06 +0800
From: Anatoly Stepanov <stepanov.anatoly@...wei.com>
To: <peterz@...radead.org>, <boqun.feng@...il.com>, <longman@...hat.com>,
	<catalin.marinas@....com>, <will@...nel.org>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	<hpa@...or.com>, <arnd@...db.de>, <dvhart@...radead.org>,
	<dave@...olabs.net>, <andrealmeid@...lia.com>
CC: <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<guohanjun@...wei.com>, <wangkefeng.wang@...wei.com>,
	<weiyongjun1@...wei.com>, <yusongping@...wei.com>, <leijitang@...wei.com>,
	<artem.kuzin@...wei.com>, <fedorov.nikita@...artners.com>,
	<kang.sun@...wei.com>, Anatoly Stepanov <stepanov.anatoly@...wei.com>
Subject: [RFC PATCH v2 5/5] kernel: futex: use HQ-spinlock for hash-buckets

This is example of HQ-spinlock enabled for futex hash-table bucket locks
(used in memcached testing scenario)

Signed-off-by: Anatoly Stepanov <stepanov.anatoly@...wei.com>

Co-authored-by: Stepanov Anatoly <stepanov.anatoly@...wei.com>
Co-authored-by: Fedorov Nikita <fedorov.nikita@...artners.com>
---
 kernel/futex/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 125804fbb..05c6d1efc 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -1521,7 +1521,7 @@ static void futex_hash_bucket_init(struct futex_hash_bucket *fhb,
 #endif
 	atomic_set(&fhb->waiters, 0);
 	plist_head_init(&fhb->chain);
-	spin_lock_init(&fhb->lock);
+	spin_lock_init_hq(&fhb->lock);
 }
 
 #define FH_CUSTOM	0x01
-- 
2.34.1