linux-kernel - Re: [PATCH 7/7] sched, x86: Optimize the preempt

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Message-ID: <20130910134247.GC7537@gmail.com>
Date:	Tue, 10 Sep 2013 15:42:47 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Jan Beulich <jbeulich@...e.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>, Peter Anvin <hpa@...or.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 7/7] sched, x86: Optimize the preempt_schedule() call


* Peter Zijlstra <peterz@...radead.org> wrote:

> +	.macro SAVE_ALL
> +	pushl_cfi %eax
> +	CFI_REL_OFFSET eax, 0
> +	pushl_cfi %ebp
> +	CFI_REL_OFFSET ebp, 0
> +	pushl_cfi %edi
> +	CFI_REL_OFFSET edi, 0
> +	pushl_cfi %esi
> +	CFI_REL_OFFSET esi, 0
> +	pushl_cfi %edx
> +	CFI_REL_OFFSET edx, 0
> +	pushl_cfi %ecx
> +	CFI_REL_OFFSET ecx, 0
> +	pushl_cfi %ebx
> +	CFI_REL_OFFSET ebx, 0
> +	.endm
> +
> +	.macro RESTORE_ALL
> +	popl_cfi %ebx
> +	CFI_RESTORE ebx
> +	popl_cfi %ecx
> +	CFI_RESTORE ecx
> +	popl_cfi %edx
> +	CFI_RESTORE edx
> +	popl_cfi %esi
> +	CFI_RESTORE esi
> +	popl_cfi %edi
> +	CFI_RESTORE edi
> +	popl_cfi %ebp
> +	CFI_RESTORE ebp
> +	popl_cfi %eax
> +	CFI_RESTORE eax
> +	.endm

Side note: shouldn't the pushl_cfi and popl_cfi macros be adjusted, 
instead of open coding it?

Thanks,

	Ingo
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