linux-kernel - Re: [patch] x86, mm: pass in 'total' to __copy_from_user

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Message-ID: <20090228125816.GA14917@elte.hu>
Date:	Sat, 28 Feb 2009 13:58:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Salman Qazi <sqazi@...gle.com>, davem@...emloft.net,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch] x86, mm: pass in 'total' to __copy_from_user_*nocache()


* Nick Piggin <nickpiggin@...oo.com.au> wrote:

> > It might be wrong on the principle though, so will revert it 
> > if needed, before it spreads into too many topics.
> 
> I would say if Linus didn't like it, revert it.
> 
> Do you use NFS with 1500 byte packets with a high speed 
> network and really fast disks (or ramdisk)? Then maybe you can 
> measure vectored write speedup with your patch over Salman's 
> more basic one :)

Can you suggest some other workload that should show sensitivity 
to this detail too? Like a simple write() loop of non-4K-sized 
files or so?

	Ingo
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