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

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Message-ID: <d0c0ae41-e0c6-4c90-9dbe-3b10a20a992e@huawei.com>
Date: Wed, 14 Jan 2026 00:36:15 +0300
From: Stepanov Anatoly <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>
Subject: Re: [RFC PATCH v2 5/5] kernel: futex: use HQ-spinlock for
 hash-buckets

On 12/6/2025 9:21 AM, Anatoly Stepanov wrote:
> 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


Hello,

gentle ping regarding the RFC

-- 
Anatoly Stepanov, Huawei