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From: Huacai Chen <chenhuacai@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>, yili0568@gmail.com
Cc: Huacai Chen <chenhuacai@loongson.cn>,
	Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Airlie <airlied@linux.ie>, Jonathan Corbet <corbet@lwn.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Xuefeng Li <lixuefeng@loongson.cn>,
	Yanteng Si <siyanteng@loongson.cn>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH V4 07/22] LoongArch: Add atomic/locking headers
Date: Sat, 2 Oct 2021 19:05:10 +0800	[thread overview]
Message-ID: <CAAhV-H5yA1_63OeYH-6KEgw1m8FUMDGHV0g_sw=F758HJhQ66w@mail.gmail.com> (raw)
In-Reply-To: <YVbrPHsDkhTl4FTA@hirez.programming.kicks-ass.net>

Hi, Peter,

On Fri, Oct 1, 2021 at 7:04 PM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Mon, Sep 27, 2021 at 02:42:44PM +0800, Huacai Chen wrote:
> > diff --git a/arch/loongarch/include/asm/spinlock.h b/arch/loongarch/include/asm/spinlock.h
> > new file mode 100644
> > index 000000000000..2544ee546596
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/spinlock.h
> > @@ -0,0 +1,12 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_SPINLOCK_H
> > +#define _ASM_SPINLOCK_H
> > +
> > +#include <asm/processor.h>
> > +#include <asm/qspinlock.h>
> > +#include <asm/qrwlock.h>
> > +
> > +#endif /* _ASM_SPINLOCK_H */
> > diff --git a/arch/loongarch/include/asm/spinlock_types.h b/arch/loongarch/include/asm/spinlock_types.h
> > new file mode 100644
> > index 000000000000..91f258401ef9
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/spinlock_types.h
> > @@ -0,0 +1,11 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_SPINLOCK_TYPES_H
> > +#define _ASM_SPINLOCK_TYPES_H
> > +
> > +#include <asm-generic/qspinlock_types.h>
> > +#include <asm-generic/qrwlock_types.h>
> > +
> > +#endif
>
> Also see the many lkml threads on this, is there big enough loongson to
> justify qspinlock? Have you tried a ticket lock?
Loongson-3A5000 supports NUMA, we have as many as 16 nodes, 64 cores
in total. And we have tried ticket lock which is worse than qspinlock.
Maybe Jun Yi (yili0568@gmail.com) can give some performace data?

Huacai

  reply	other threads:[~2021-10-02 11:05 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-27  6:42 [PATCH V4 00/22] arch: Add basic LoongArch support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 01/22] Documentation: LoongArch: Add basic documentations Huacai Chen
2021-09-27  6:42 ` [PATCH V4 02/22] Documentation/zh_CN: Add basic LoongArch documentations Huacai Chen
2021-09-27  6:42 ` [PATCH V4 03/22] LoongArch: Add elf-related definitions Huacai Chen
2021-09-27  6:42 ` [PATCH V4 04/22] LoongArch: Add writecombine support for drm Huacai Chen
2021-09-27  6:42 ` [PATCH V4 05/22] LoongArch: Add build infrastructure Huacai Chen
2021-09-27  6:42 ` [PATCH V4 06/22] LoongArch: Add CPU definition headers Huacai Chen
2021-09-30 15:30   ` Xi Ruoyao
2021-10-02 10:49     ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 07/22] LoongArch: Add atomic/locking headers Huacai Chen
2021-10-01 10:52   ` Peter Zijlstra
2021-10-02 11:47     ` Huacai Chen
2021-10-01 11:04   ` Peter Zijlstra
2021-10-02 11:05     ` Huacai Chen [this message]
2021-09-27  6:42 ` [PATCH V4 08/22] LoongArch: Add other common headers Huacai Chen
2021-09-27  6:42 ` [PATCH V4 09/22] LoongArch: Add boot and setup routines Huacai Chen
2021-09-27  6:52   ` Ard Biesheuvel
2021-09-29  3:24     ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 10/22] LoongArch: Add exception/interrupt handling Huacai Chen
2021-09-27  6:42 ` [PATCH V4 11/22] LoongArch: Add process management Huacai Chen
2021-10-03  2:48   ` Al Viro
2021-10-03  9:10     ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 12/22] LoongArch: Add memory management Huacai Chen
2021-09-27  6:42 ` [PATCH V4 13/22] LoongArch: Add system call support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 14/22] LoongArch: Add signal handling support Huacai Chen
2021-10-03  2:29   ` Al Viro
2021-10-03  9:09     ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 15/22] LoongArch: Add elf and module support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 16/22] LoongArch: Add misc common routines Huacai Chen
2021-10-01 11:03   ` Peter Zijlstra
2021-10-02 10:56     ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 17/22] LoongArch: Add some library functions Huacai Chen
2021-09-27  6:42 ` [PATCH V4 18/22] LoongArch: Add PCI controller support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 19/22] LoongArch: Add VDSO and VSYSCALL support Huacai Chen
2021-09-30 15:43   ` Xi Ruoyao
2021-10-02 10:53     ` Huacai Chen
2021-10-02 12:13       ` Xi Ruoyao
2021-10-02 12:44         ` Huacai Chen
2021-09-27  6:42 ` [PATCH V4 20/22] LoongArch: Add multi-processor (SMP) support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support Huacai Chen
2021-09-27  6:42 ` [PATCH V4 22/22] LoongArch: Add Loongson-3 default config file Huacai Chen

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