linux-kernel - Re: [BUG] Page allocation failures with newest kernels

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Date:	Tue, 31 May 2016 12:29:51 +0200
From:	Marcin Wojtas <mw@...ihalf.com>
To:	Robin Murphy <robin.murphy@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Lior Amsalem <alior@...vell.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Grzegorz Jaszczyk <jaz@...ihalf.com>,
	Will Deacon <will.deacon@....com>, nadavh@...vell.com,
	Tomasz Nowicki <tn@...ihalf.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>
Subject: Re: [BUG] Page allocation failures with newest kernels

Hi Robin,

>
> I remember there were some issues around 4.2 with the revision of the arm64
> atomic implementations affecting the cmpxchg_double() in SLUB, but those
> should all be fixed (and the symptoms tended to be considerably more fatal).
> A stronger candidate would be 97303480753e (which landed in 4.4), which has
> various knock-on effects on the layout of SLUB internals - does fiddling
> with L1_CACHE_SHIFT make any difference?
>

I'll check the commits, thanks. I forgot to add L1_CACHE_SHIFT was my
first suspect - I had spent a long time debugging network controller,
which stopped working because of this change - L1_CACHE_BYTES (and
hence NET_SKB_PAD) not fitting HW constraints. Anyway reverting it
didn't help at all for page alloc issue.

Best regards,
Marcin