From: Fedorov Nikita <fedorov.nikita@h-partners.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>, <x86@kernel.org>,
<hpa@zytor.com>, Juergen Gross <jgross@suse.com>,
Ajay Kaher <ajay.kaher@broadcom.com>,
Alexey Makhalov <alexey.makhalov@broadcom.com>,
<bcm-kernel-feedback-list@broadcom.com>,
Arnd Bergmann <arnd@arndb.de>,
Peter Zijlstra <peterz@infradead.org>,
Boqun Feng <boqun@kernel.org>, Waiman Long <longman@redhat.com>,
Darren Hart <dvhart@infradead.org>,
Davidlohr Bueso <dave@stgolabs.net>, <andrealmeid@igalia.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>, Zi Yan <ziy@nvidia.com>,
Matthew Brost <matthew.brost@intel.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Rakie Kim <rakie.kim@sk.com>, <byungchul@sk.com>,
Gregory Price <gourry@gourry.net>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Anatoly Stepanov <stepanov.anatoly@huawei.com>
Cc: Nikita Fedorov <fedorov.nikita@h-partners.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <virtualization@lists.linux.dev>,
<linux-arch@vger.kernel.org>, <linux-mm@kvack.org>,
<guohanjun@huawei.com>, <wangkefeng.wang@huawei.com>,
<weiyongjun1@huawei.com>, <yusongping@huawei.com>,
<leijitang@huawei.com>, <artem.kuzin@huawei.com>,
<kang.sun@huawei.com>, <chenjieping3@huawei.com>
Subject: [RFC PATCH v3 7/7] futex: use hq-spinlock for hash buckets
Date: Thu, 16 Apr 2026 00:44:59 +0800 [thread overview]
Message-ID: <20260415164459.2904963-8-fedorov.nikita@h-partners.com> (raw)
In-Reply-To: <20260415164459.2904963-1-fedorov.nikita@h-partners.com>
Example of hq-spinlock enabled for futex hash-table bucket locks
(used in memcached testing scenario)
In the evaluated memcached workloads, this improved throughput by up to
10% on AMD EPYC 9654 and by up to 8% on Kunpeng 920, with corresponding
latency reductions.
Co-developed-by: Anatoly Stepanov <stepanov.anatoly@huawei.com>
Signed-off-by: Anatoly Stepanov <stepanov.anatoly@huawei.com>
Co-developed-by: Nikita Fedorov <fedorov.nikita@h-partners.com>
Signed-off-by: Nikita Fedorov <fedorov.nikita@h-partners.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 31e83a0978..042cdc7f75 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
prev parent reply other threads:[~2026-04-15 16:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-15 16:44 [RFC PATCH v3 0/7] Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 1/7] kernel: add hq-spinlock types Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 2/7] hq-spinlock: implement inner logic Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 3/7] hq-spinlock: add contention detection Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 4/7] hq-spinlock: add hq-spinlock tunables and debug statistics Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 5/7] kernel: introduce general hq-spinlock support Fedorov Nikita
2026-04-15 16:44 ` [RFC PATCH v3 6/7] lockref: use hq-spinlock Fedorov Nikita
2026-04-15 16:44 ` Fedorov Nikita [this message]
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