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Date: Wed, 28 May 2014 22:14:28 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
MIME-Version: 1.0
Subject: Re: [RFC 2/2] x86_64: expand kernel stack to 16K
References: <1401260039-18189-1-git-send-email-minchan@kernel.org>	<1401260039-18189-2-git-send-email-minchan@kernel.org>	<CA+55aFxXdc22dirnE49UbQP_2s2vLQpjQFL+NptuyK7Xry6c=g@mail.gmail.com>	<20140528223142.GO8554@dastard>	<CA+55aFyRk6_v6COPGVvu6hvt=i2A8-dPcs1X3Ydn1g24AxbPkg@mail.gmail.com>	<20140529013007.GF6677@dastard> <CA+55aFzdq2V-Q3WUV7hQJG8jBSAvBqdYLVTNtbD4ObVZ5yDRmw@mail.gmail.com>
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Sender: owner-linux-mm@kvack.org
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To: Linus Torvalds <torvalds@linux-foundation.org>, Dave Chinner <david@fromorbit.com>, Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, linux-mm <linux-mm@kvack.org>, Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>, Rusty Russell <rusty@rustcorp.com.au>, "Michael S. Tsirkin" <mst@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Steven Rostedt <rostedt@goodmis.org>

On 05/28/2014 07:42 PM, Linus Torvalds wrote:
> 
> And Minchan running out of stack is at least _partly_ due to his debug
> options (that DEBUG_PAGEALLOC thing as an extreme example, but I
> suspect there's a few other options there that generate more bloated
> data structures too too).
> 

I have wondered if a larger stack would make sense as a debug option.
I'm just worried it will be abused.

	-hpa


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