linux-kernel - Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt

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Message-ID: <53DC10FF.9050704@zytor.com>
Date:	Fri, 01 Aug 2014 15:13:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Denys Vlasenko <vda.linux@...glemail.com>
CC:	Denys Vlasenko <dvlasenk@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct
 pt_regs"

On 08/01/2014 03:11 PM, Denys Vlasenko wrote:
>>
>> Could you please try to see if there is a measurable change in the
>> latency of a trivial syscall?
> 
> Will do.
> Something along the lines of "how long does it take to execute two
> gazillions of getppid()?"
> 

Something like that, yes, but you have to run enough data points so you
can determine if the difference is statistically significant or just noise.

	-hpa

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