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From: "Ken Chen" <kenchen@google.com>
To: "Hugh Dickins" <hugh@veritas.com>
Cc: "Adam Litke" <agl@us.ibm.com>, "Andrew Morton" <akpm@osdl.org>,
	"William Irwin" <wli@holomorphy.com>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Don't allow the stack to grow into hugetlb reserved regions
Date: Fri, 26 Jan 2007 14:48:44 -0800	[thread overview]
Message-ID: <b040c32a0701261448k122f5cc7q5368b3b16ee1dc1f@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0701262025590.22196@blonde.wat.veritas.com>

On 1/26/07, Hugh Dickins <hugh@veritas.com> wrote:
> Less trivial (and I wonder whether you've come to this from an ia64
> or a powerpc direction): I notice that ia64 has more stringent REGION
> checks in its ia64_do_page_fault, before calling expand_stack or
> expand_upwards.  So on that path, the usual path, I think your
> new check in acct_stack_growth is unnecessary on ia64;

I think you are correct. This appears to affect powerpc only. On ia64,
hugetlb lives in a completely different region and they can never step
into normal stack address space. And for x86, there isn't a thing called
"reserved address space" for hugetlb mapping.

        - Ken

  reply	other threads:[~2007-01-26 22:49 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-25 21:40 Adam Litke
2007-01-26 20:05 ` Andrew Morton
2007-01-26 21:02 ` Hugh Dickins
2007-01-26 22:48   ` Ken Chen [this message]
2007-01-27  9:08     ` Hugh Dickins
2007-01-28 20:27       ` Ken Chen
2007-01-29 17:26         ` Hugh Dickins
2007-01-29 18:32           ` Ken Chen
2007-01-29 18:34 Adam Litke

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