linux-kernel - RE: new execve/kernel

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Date:	Fri, 19 Oct 2012 17:16:50 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Al Viro <viro@...IV.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linus-arch@...r.kernel.org" <linus-arch@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	David Howells <dhowells@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Michal Simek <monstr@...str.eu>,
	Jonas Bonn <jonas@...thpole.se>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Richard Kuo <rkuo@...eaurora.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Lennox Wu <lennox.wu@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Mundt <lethal@...ux-sh.org>,
	Chris Zankel <chris@...kel.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Guan Xuetao <gxt@...c.pku.edu.cn>
Subject: RE: new execve/kernel_thread design

> Surprisingly enough, ia64 one seems to work on actual hardware; I have sent
> Tony an incremental patch cleaning copy_thread() up, waiting for results of
> testing that on SMP box.

Tiny bit faster than plain 3.7-rc1. lmbench3 reports fork+execve test at between
558 to 567 usec with the new code, compared with 562-572 usec with the old.

-Tony
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