linux-kernel - Re: [PATCH 0/2] arm64: TLB flush issues

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Message-ID: <20140502153019.GA9179@linaro.org>
Date:	Fri, 2 May 2014 16:30:21 +0100
From:	Steve Capper <steve.capper@...aro.org>
To:	Mark Salter <msalter@...hat.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] arm64: TLB flush issues

On Fri, May 02, 2014 at 11:20:33AM -0400, Mark Salter wrote:
> As explained in more detail in the second patch, I have observed a soft
> lockup under some loads. These lockups were in flush_tlb_kernel_range()
> which was looping through a very large address range. While looking into
> this, I also noticed the flush routines in tlb.S were not properly
> handling pages larger than 4k. This is corrected in the first patch.
> The second patch limits the loop size for the flush_tlb_[kernel_]range
> functions. It uses an arbitrary constant to limit the loop, but it
> would be better if it were based on actual tlb size or some other
> heuristic.
> 
> Mark Salter (2):
>   arm64: fix unnecessary tlb flushes
>   arm64: fix soft lockup due to large tlb flush range
> 
>  arch/arm64/include/asm/tlbflush.h | 28 +++++++++++++++++++++++++---
>  arch/arm64/mm/tlb.S               |  4 ++--
>  2 files changed, 27 insertions(+), 5 deletions(-)
> 

Hi Mark,
As a heads-up, I posted this earlier today:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-May/252837.html

Cheers,
-- 
Steve
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