From: Nick Piggin <npiggin@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, dkegel@google.com,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
David Miller <davem@davemloft.net>
Subject: Re: [RFC 0/9] Reclaim during GFP_ATOMIC allocs
Date: Thu, 16 Aug 2007 04:49:49 +0200 [thread overview]
Message-ID: <20070816024949.GA16372@wotan.suse.de> (raw)
In-Reply-To: <20070814153021.446917377@sgi.com>
On Tue, Aug 14, 2007 at 08:30:21AM -0700, Christoph Lameter wrote:
> This is the extended version of the reclaim patchset. It enables reclaim from
> clean file backed pages during GFP_ATOMIC allocs. A bit invasive since
> may locks must now be taken with saving flags. But it works.
>
> Tested by repeatedly allocating 12MB of memory from the timer interrupt.
>
> --
Just to clarify... I can see how recursive reclaim can prevent memory getting
eaten up by reclaim (which thus causes allocations from interrupt handlers to
fail)...
But this patchset I don't see will do anything to prevent reclaim deadlocks,
right? (because if there is reclaimable memory at hand, then kswapd should
eventually reclaim it).
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, dkegel@google.com,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
David Miller <davem@davemloft.net>
Subject: Re: [RFC 0/9] Reclaim during GFP_ATOMIC allocs
Date: Thu, 16 Aug 2007 04:49:49 +0200 [thread overview]
Message-ID: <20070816024949.GA16372@wotan.suse.de> (raw)
In-Reply-To: <20070814153021.446917377@sgi.com>
On Tue, Aug 14, 2007 at 08:30:21AM -0700, Christoph Lameter wrote:
> This is the extended version of the reclaim patchset. It enables reclaim from
> clean file backed pages during GFP_ATOMIC allocs. A bit invasive since
> may locks must now be taken with saving flags. But it works.
>
> Tested by repeatedly allocating 12MB of memory from the timer interrupt.
>
> --
Just to clarify... I can see how recursive reclaim can prevent memory getting
eaten up by reclaim (which thus causes allocations from interrupt handlers to
fail)...
But this patchset I don't see will do anything to prevent reclaim deadlocks,
right? (because if there is reclaimable memory at hand, then kswapd should
eventually reclaim it).
--
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next prev parent reply other threads:[~2007-08-16 2:50 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-14 15:30 [RFC 0/9] Reclaim during GFP_ATOMIC allocs Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 1/9] Allow reclaim via __GFP_NOMEMALLOC reclaim Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 2/9] Use NOMEMALLOC reclaim to allow reclaim if PF_MEMALLOC is set Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-18 7:10 ` Pavel Machek
2007-08-18 7:10 ` Pavel Machek
2007-08-20 19:00 ` Christoph Lameter
2007-08-20 19:00 ` Christoph Lameter
2007-08-20 20:17 ` Peter Zijlstra
2007-08-20 20:17 ` Peter Zijlstra
2007-08-20 20:27 ` Christoph Lameter
2007-08-20 20:27 ` Christoph Lameter
2007-08-20 21:14 ` Peter Zijlstra
2007-08-20 21:14 ` Peter Zijlstra
2007-08-20 21:17 ` Christoph Lameter
2007-08-20 21:17 ` Christoph Lameter
2007-08-21 14:07 ` Peter Zijlstra
2007-08-21 0:39 ` Nick Piggin
2007-08-21 0:39 ` Nick Piggin
2007-08-21 14:07 ` Peter Zijlstra
2007-08-23 3:38 ` Nick Piggin
2007-08-23 3:38 ` Nick Piggin
2007-08-23 9:26 ` Peter Zijlstra
2007-08-23 10:11 ` Nikita Danilov
2007-08-23 10:11 ` Nikita Danilov
2007-08-23 13:58 ` Peter Zijlstra
2007-08-24 4:00 ` Nick Piggin
2007-08-24 4:00 ` Nick Piggin
2007-08-14 15:30 ` [RFC 3/9] Make cond_rescheds conditional on __GFP_WAIT Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 20:02 ` Andi Kleen
2007-08-14 20:02 ` Andi Kleen
2007-08-14 19:12 ` Christoph Lameter
2007-08-14 19:12 ` Christoph Lameter
2007-08-14 20:05 ` Peter Zijlstra
2007-08-14 20:05 ` Peter Zijlstra
2007-08-14 20:34 ` Andi Kleen
2007-08-14 20:34 ` Andi Kleen
2007-08-14 20:33 ` Andi Kleen
2007-08-14 20:33 ` Andi Kleen
2007-08-14 20:42 ` Christoph Lameter
2007-08-14 20:42 ` Christoph Lameter
2007-08-14 20:44 ` Andi Kleen
2007-08-14 20:44 ` Andi Kleen
2007-08-14 21:15 ` Christoph Lameter
2007-08-14 21:15 ` Christoph Lameter
2007-08-14 21:23 ` Andi Kleen
2007-08-14 21:23 ` Andi Kleen
2007-08-14 21:26 ` Christoph Lameter
2007-08-14 21:26 ` Christoph Lameter
2007-08-14 21:29 ` Andi Kleen
2007-08-14 21:29 ` Andi Kleen
2007-08-14 21:37 ` Christoph Lameter
2007-08-14 21:37 ` Christoph Lameter
2007-08-14 21:44 ` Andi Kleen
2007-08-14 21:44 ` Andi Kleen
2007-08-14 21:48 ` Christoph Lameter
2007-08-14 21:48 ` Christoph Lameter
2007-08-14 21:56 ` Andi Kleen
2007-08-14 21:56 ` Andi Kleen
2007-08-14 22:07 ` Christoph Lameter
2007-08-14 22:07 ` Christoph Lameter
2007-08-14 22:16 ` Andi Kleen
2007-08-14 22:16 ` Andi Kleen
2007-08-14 22:20 ` Christoph Lameter
2007-08-14 22:20 ` Christoph Lameter
2007-08-14 22:21 ` Andi Kleen
2007-08-14 22:21 ` Andi Kleen
2007-08-14 22:41 ` Christoph Lameter
2007-08-14 22:41 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 5/9] Save irqflags on taking the mapping lock Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 6/9] Disable irqs on taking the private_lock Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 7/9] Save flags in swap.c Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 8/9] Reclaim on an atomic allocation if necessary Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 9/9] Testing: Perform GFP_ATOMIC overallocation Christoph Lameter
2007-08-14 15:30 ` Christoph Lameter
2007-08-16 2:49 ` Nick Piggin [this message]
2007-08-16 2:49 ` [RFC 0/9] Reclaim during GFP_ATOMIC allocs Nick Piggin
2007-08-16 20:24 ` Christoph Lameter
2007-08-16 20:24 ` Christoph Lameter
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