From: Christoph Lameter <clameter@sgi.com>
To: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <ak@suse.de>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, travis@sgi.com
Subject: Re: [13/18] x86_64: Allow fallback for the stack
Date: Thu, 4 Oct 2007 14:20:19 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0710041418100.12779@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20071004153940.49bd5afc@bree.surriel.com>
On Thu, 4 Oct 2007, Rik van Riel wrote:
> > Well we can now address the rarity. That is the whole point of the
> > patchset.
>
> Introducing complexity to fight a very rare problem with a good
> fallback (refusing to fork more tasks, as well as lumpy reclaim)
> somehow does not seem like a good tradeoff.
The problem can become non-rare on special low memory machines doing wild
swapping things though.
> > It will be more common if the stack size is increased beyond 8k.
>
> Why would we want to do such a thing?
Because NUMA requires more stack space. In particular support for very
large cpu configurations of 16k may require 2k cpumasks on the stack.
> 8kB stacks are large enough...
For many things yes. I just want to have the compile time option to
increase it.
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next prev parent reply other threads:[~2007-10-04 21:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-04 3:59 [00/18] Virtual Compound Page Support V2 Christoph Lameter
2007-10-04 3:59 ` [01/18] vmalloc: clean up page array indexing Christoph Lameter
2007-10-04 3:59 ` [02/18] vunmap: return page array passed on vmap() Christoph Lameter
2007-10-04 3:59 ` [03/18] vmalloc_address(): Determine vmalloc address from page struct Christoph Lameter
2007-10-04 3:59 ` [04/18] Vcompound: Smart up virt_to_head_page() Christoph Lameter
2007-10-04 3:59 ` [05/18] Page flags: Add PageVcompound() Christoph Lameter
2007-10-04 3:59 ` [06/18] Vcompound: Update page address determination Christoph Lameter
2007-10-04 3:59 ` [07/18] Vcompound: Add compound_nth_page() to determine nth base page Christoph Lameter
2007-10-04 3:59 ` [08/18] GFP_VFALLBACK: Allow fallback of compound pages to virtual mappings Christoph Lameter
2007-10-04 3:59 ` [09/18] Vcompound: GFP_VFALLBACK debugging aid Christoph Lameter
2007-10-04 3:59 ` [10/18] Sparsemem: Use fallback for the memmap Christoph Lameter
2007-10-04 3:59 ` [11/18] Page allocator: Use a higher order allocation for the zone wait table Christoph Lameter
2007-10-04 3:59 ` [12/18] Wait: Allow bit_waitqueue to wait on a bit in a virtual compound page Christoph Lameter
2007-10-04 3:59 ` [13/18] x86_64: Allow fallback for the stack Christoph Lameter
2007-10-04 11:56 ` Andi Kleen
2007-10-04 12:08 ` Peter Zijlstra
2007-10-04 12:25 ` Andi Kleen
2007-10-04 12:30 ` Peter Zijlstra
2007-10-04 17:40 ` Christoph Lameter
2007-10-04 19:20 ` Christoph Lameter
2007-10-04 19:39 ` Rik van Riel
2007-10-04 21:20 ` Christoph Lameter [this message]
2007-10-07 7:35 ` Nick Piggin
2007-10-08 17:36 ` Christoph Lameter
2007-10-08 12:55 ` Nick Piggin
2007-10-09 18:39 ` Christoph Lameter
2007-10-09 8:46 ` Nick Piggin
2007-10-10 1:26 ` Christoph Lameter
2007-10-09 9:56 ` Nick Piggin
2007-10-10 3:36 ` where to get ZONE_MOVABLE pathces? Jacky(GuangXiang Lee)
2007-10-10 10:32 ` Mel Gorman
2007-10-06 18:53 ` [13/18] x86_64: Allow fallback for the stack Bill Davidsen
2007-10-04 3:59 ` [14/18] Configure stack size Christoph Lameter
2007-10-04 4:36 ` Arjan van de Ven
2007-10-04 4:43 ` David Miller, Arjan van de Ven
2007-10-04 19:34 ` Christoph Lameter
2007-10-04 9:11 ` Andi Kleen
2007-10-04 19:26 ` Christoph Lameter
2007-10-04 3:59 ` [15/18] Fallback for temporary order 2 allocation Christoph Lameter
2007-10-04 3:59 ` [16/18] Virtual Compound page allocation from interrupt context Christoph Lameter
2007-10-04 3:59 ` [17/18] Virtual compound page freeing in " Christoph Lameter
2007-10-04 3:59 ` [18/18] SLUB: Use fallback for table of callers/freers of a slab cache Christoph Lameter
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