linux-kernel - Re: [PATCH 1/3] swiotlb: Warn on allocation failure in swiotlb_alloc

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Date:	Tue, 2 Dec 2014 13:46:15 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Joerg Roedel <jroedel@...e.de>
Cc:	Joerg Roedel <joro@...tes.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] swiotlb: Warn on allocation failure in
 swiotlb_alloc_coherent

On Tue, Dec 02, 2014 at 03:41:22PM +0100, Joerg Roedel wrote:
> On Mon, Dec 01, 2014 at 03:28:03PM -0500, Konrad Rzeszutek Wilk wrote:
> > On Fri, Nov 28, 2014 at 12:29:07PM +0100, Joerg Roedel wrote:
> > > From: Joerg Roedel <jroedel@...e.de>
> > > 
> > > Print a warning when all allocation tries have been failed
> > > and the function is about to return NULL. This prepares for
> > > calling the function with __GFP_NOWARN to suppress
> > > allocation failure warnings before all fall-backs have
> > > failed.
> > 
> > This can be quite noisy. Especially the dump-stack.
> 
> Well, this is as noisy as the dump_stack()s from the page-allocator when
> the first allocation try fails. The goal of the first two patches in

Right, on the first allocation. Subsequent allocations won't be so noisy
in the page-allocator (I think?). While this will be noisy on subsequent
ones.

> this series is to only print a warning (with stack-trace) when
> alloc_coherent failed, and not when only an intermediate step failed
> that has a fall-back anyway (and might thus be no real problem).
> 
> 
> 	Joerg
> 
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