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From: Charlie Jenkins <charlie@rivosinc.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Huacai Chen <chenhuacai@kernel.org>,
	WANG Xuerui <kernel@xen0n.name>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Alexandre Ghiti <alexghiti@rivosinc.com>,
	Arnd Bergmann <arnd@arndb.de>, Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	loongarch@lists.linux.dev
Subject: Re: [PATCH v6 0/4] entry: Move ret_from_fork() to C and inline syscall_exit_to_user_mode()
Date: Mon, 28 Apr 2025 14:54:40 -0700	[thread overview]
Message-ID: <aA_5IGGvXqB7v_EA@ghost> (raw)
In-Reply-To: <87frj613kz.ffs@tglx>

On Fri, Mar 21, 2025 at 10:22:36PM +0100, Thomas Gleixner wrote:
> On Thu, Mar 20 2025 at 10:29, Charlie Jenkins wrote:
> > Similar to commit 221a164035fd ("entry: Move
> > syscall_enter_from_user_mode() to header file"), move
> > syscall_exit_to_user_mode() to the header file as well.
> >
> > Testing was done with the byte-unixbench [1] syscall benchmark (which
> > calls getpid) and QEMU. On riscv I measured a 7.09246% improvement, on
> > x86 a 2.98843% improvement, on loongarch a 6.07954% improvement, and on
> > s390 a 11.1328% improvement.
> >
> > The Intel bot also reported "kernel test robot noticed a 1.9%
> > improvement of stress-ng.seek.ops_per_sec" [2]
> >
> > Since this is on QEMU, I know these numbers are not perfect, but they
> > show a trend of general improvement across all architectures that use
> > the generic entry code.
> 
> This looks sane now. I've bookmarked it as post-merge window material.

Has this been applied somewhere?

- Charlie

> 
> Thanks,
> 
>         tglx

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WARNING: multiple messages have this Message-ID (diff)
From: Charlie Jenkins <charlie@rivosinc.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Huacai Chen <chenhuacai@kernel.org>,
	WANG Xuerui <kernel@xen0n.name>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Alexandre Ghiti <alexghiti@rivosinc.com>,
	Arnd Bergmann <arnd@arndb.de>, Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	loongarch@lists.linux.dev
Subject: Re: [PATCH v6 0/4] entry: Move ret_from_fork() to C and inline syscall_exit_to_user_mode()
Date: Mon, 28 Apr 2025 14:54:40 -0700	[thread overview]
Message-ID: <aA_5IGGvXqB7v_EA@ghost> (raw)
In-Reply-To: <87frj613kz.ffs@tglx>

On Fri, Mar 21, 2025 at 10:22:36PM +0100, Thomas Gleixner wrote:
> On Thu, Mar 20 2025 at 10:29, Charlie Jenkins wrote:
> > Similar to commit 221a164035fd ("entry: Move
> > syscall_enter_from_user_mode() to header file"), move
> > syscall_exit_to_user_mode() to the header file as well.
> >
> > Testing was done with the byte-unixbench [1] syscall benchmark (which
> > calls getpid) and QEMU. On riscv I measured a 7.09246% improvement, on
> > x86 a 2.98843% improvement, on loongarch a 6.07954% improvement, and on
> > s390 a 11.1328% improvement.
> >
> > The Intel bot also reported "kernel test robot noticed a 1.9%
> > improvement of stress-ng.seek.ops_per_sec" [2]
> >
> > Since this is on QEMU, I know these numbers are not perfect, but they
> > show a trend of general improvement across all architectures that use
> > the generic entry code.
> 
> This looks sane now. I've bookmarked it as post-merge window material.

Has this been applied somewhere?

- Charlie

> 
> Thanks,
> 
>         tglx

  reply	other threads:[~2025-04-28 21:54 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-20 17:29 [PATCH v6 0/4] entry: Move ret_from_fork() to C and inline syscall_exit_to_user_mode() Charlie Jenkins
2025-03-20 17:29 ` Charlie Jenkins
2025-03-20 17:29 ` [PATCH v6 1/4] riscv: entry: Convert ret_from_fork() to C Charlie Jenkins
2025-03-20 17:29   ` Charlie Jenkins
2025-04-29  6:33   ` [tip: core/entry] " tip-bot2 for Charlie Jenkins
2025-03-20 17:29 ` [PATCH v6 2/4] riscv: entry: Split ret_from_fork() into user and kernel Charlie Jenkins
2025-03-20 17:29   ` Charlie Jenkins
2025-03-21  6:36   ` Alexandre Ghiti
2025-03-21  6:36     ` Alexandre Ghiti
2025-04-29  6:33   ` [tip: core/entry] " tip-bot2 for Charlie Jenkins
2025-03-20 17:29 ` [PATCH v6 3/4] LoongArch: entry: Migrate ret_from_fork() to C Charlie Jenkins
2025-03-20 17:29   ` Charlie Jenkins
2025-04-29  6:33   ` [tip: core/entry] " tip-bot2 for Charlie Jenkins
2025-05-05  4:58   ` [PATCH v6 3/4] " Huacai Chen
2025-05-05  4:58     ` Huacai Chen
2025-03-20 17:29 ` [PATCH v6 4/4] entry: Inline syscall_exit_to_user_mode() Charlie Jenkins
2025-03-20 17:29   ` Charlie Jenkins
2025-04-29  6:33   ` [tip: core/entry] " tip-bot2 for Charlie Jenkins
2025-03-21 21:22 ` [PATCH v6 0/4] entry: Move ret_from_fork() to C and inline syscall_exit_to_user_mode() Thomas Gleixner
2025-03-21 21:22   ` Thomas Gleixner
2025-04-28 21:54   ` Charlie Jenkins [this message]
2025-04-28 21:54     ` Charlie Jenkins
2025-04-29  6:22     ` Thomas Gleixner
2025-04-29  6:22       ` Thomas Gleixner

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