linux-kernel - Re: [linux-usb-devel] [PATCH 3/4] usb: allocated usb releated dma buffer with?kmalloc

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Message-Id: <200707030912.40185.oliver@neukum.org>
Date:	Tue, 3 Jul 2007 09:12:39 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Greg KH <greg@...ah.com>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [linux-usb-devel] [PATCH 3/4] usb: allocated usb releated dma buffer with?kmalloc_node

Am Dienstag, 3. Juli 2007 schrieb Greg KH:
> > > Ok, so two drivers might need this, but not the whole usb core, right?
> > 
> > If those two drivers need the extended allocator, why not use it where
> > it is beneficial, even if the benefit is small?
> 
> What is the benefit?  Speed isn't an issue here, so what is?

Speed is always an issue. Every cycle used in the kernel is lost to
user space.

	Regards
		Oliver

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