Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC)

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To: Nick Piggin <npiggin@...>
Cc: Christoph Lameter <clameter@...>, <linux-mm@...>, <linux-kernel@...>, <akpm@...>, <dkegel@...>, David Miller <davem@...>, Daniel Phillips <phillips@...>
Date: Tuesday, August 21, 2007 - 11:29 am

[ now with CCs ]

On Tue, 2007-08-21 at 02:28 +0200, Nick Piggin wrote:


That has been my intention, getting the problem solved without touching
fast paths and with minimal changes to how things are currently done.


Christoph's patches all rely on file backed memory being predominant.
[ and to a certain degree fully ignore anonymous memory loads :-( ]

Whereas quite a few realistic loads strive to minimise these - I'll
again fall back to my MPI cluster example, they would want to use so
much anonymous memory to preform their calculations that everything
except the hot paths of code are present in memory. In these scenarios 1
MB of text would already be a lot.

etwork

I'm wanting to keep the patches as non-intrusive as possible, exactly
because some people consider this a fringe functionality. Doing as you
say does sound like a noble goal, but would require massive overhauls.

Also, I'm not quite sure how this would apply to networking. It
generally doesn't have much reclaimable memory sitting around, and it
heavily relies on kmalloc so an alloc/free cycle accounting system would
quickly involve a lot of the things I'm already doing.

(also one advantage of keeping it all in the buddy allocator is that it
can more easily form larger order pages)
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Messages in current thread:
[RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Tue Aug 14, 10:21 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Wed Sep 5, 5:20 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Sep 5, 6:42 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Wed Sep 5, 12:16 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Sep 10, 3:25 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Mon Sep 10, 3:55 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Sep 10, 4:22 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Mon Sep 10, 4:48 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Pavel Machek, (Fri Oct 26, 1:44 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Sat Oct 27, 7:08 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Fri Oct 26, 1:55 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Sat Oct 27, 6:58 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Mike Snitzer, (Sat Sep 8, 1:12 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Mon Sep 17, 8:28 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Mike Snitzer, (Mon Sep 17, 11:27 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Tue Sep 18, 5:30 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Daniel Phillips, (Tue Sep 18, 1:37 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Wed Sep 5, 7:42 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Sep 5, 8:14 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Wed Sep 12, 6:52 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Sep 12, 6:47 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Thu Sep 13, 4:19 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Thu Sep 13, 2:32 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Thu Sep 13, 3:24 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Wed Sep 5, 8:19 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Sep 10, 3:29 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Tue Sep 11, 3:41 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Mon Sep 10, 3:37 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Sep 10, 3:41 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Mon Sep 10, 3:55 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Sep 10, 4:17 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Mon Sep 10, 4:48 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Wed Aug 15, 8:22 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Wed Aug 15, 9:12 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Wed Aug 15, 11:29 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Sun Aug 19, 11:51 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Mon Aug 20, 8:28 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Sep 12, 6:39 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Tue Aug 21, 11:29 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Wed Aug 22, 11:02 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Mon Aug 20, 3:15 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Nick Piggin, (Mon Aug 20, 8:32 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Thu Aug 16, 4:27 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Aug 15, 4:29 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Andi Kleen, (Wed Aug 15, 10:15 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Wed Aug 15, 9:55 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Wed Aug 15, 4:32 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Andi Kleen, (Wed Aug 15, 10:34 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Tue Aug 14, 10:36 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Tue Aug 14, 11:29 am)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Peter Zijlstra, (Tue Aug 14, 3:32 pm)
Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC), Christoph Lameter, (Tue Aug 14, 3:41 pm)