From: Arjan van de Ven <arjan@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
"Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
ak@suse.de, gregkh@suse.de, muli@il.ibm.com, ashok.raj@intel.com,
davem@davemloft.net, clameter@sgi.com
Subject: Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls
Date: Wed, 20 Jun 2007 12:14:57 -0700 [thread overview]
Message-ID: <46797CB1.8070008@linux.intel.com> (raw)
In-Reply-To: <1182362703.21117.79.camel@twins>
Peter Zijlstra wrote:
> So a reclaim context (kswapd and direct reclaim) set PF_MEMALLOC to
> ensure they themselves will not block on a memory allocation. And it is
> understood that these code paths have a bounded memory footprint.
that's a too simplistic view though; what happens is that kswapd will
queue the IO, but the irq context will then take the IO from the queue
and do the DMA mapping... which needs the memory.....
next prev parent reply other threads:[~2007-06-20 19:16 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-19 21:37 [Intel IOMMU 00/10] Intel IOMMU support, take #2 Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 01/10] DMAR detection and parsing logic Keshavamurthy, Anil S
2007-07-04 9:18 ` Peter Zijlstra
2007-07-04 10:04 ` Andrew Morton
2007-07-04 10:14 ` Peter Zijlstra
2007-06-19 21:37 ` [Intel IOMMU 02/10] PCI generic helper function Keshavamurthy, Anil S
2007-06-26 5:49 ` Andrew Morton
2007-06-26 14:44 ` Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 03/10] clflush_cache_range now takes size param Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 04/10] IOVA allocation and management routines Keshavamurthy, Anil S
2007-06-26 6:07 ` Andrew Morton
2007-06-26 16:16 ` Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 05/10] Intel IOMMU driver Keshavamurthy, Anil S
2007-06-19 23:32 ` Christoph Lameter
2007-06-19 23:50 ` Keshavamurthy, Anil S
2007-06-19 23:56 ` Christoph Lameter
2007-06-26 6:32 ` Andrew Morton
2007-06-26 16:29 ` Keshavamurthy, Anil S
2007-06-26 6:25 ` Andrew Morton
2007-06-26 16:33 ` Keshavamurthy, Anil S
2007-06-26 6:30 ` Andrew Morton
2007-06-19 21:37 ` [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls Keshavamurthy, Anil S
2007-06-19 23:25 ` Christoph Lameter
2007-06-19 23:27 ` Arjan van de Ven
2007-06-19 23:34 ` Christoph Lameter
2007-06-20 0:02 ` Arjan van de Ven
2007-06-20 8:06 ` Peter Zijlstra
2007-06-20 13:03 ` Arjan van de Ven
2007-06-20 17:30 ` Siddha, Suresh B
2007-06-20 18:05 ` Peter Zijlstra
2007-06-20 19:14 ` Arjan van de Ven [this message]
2007-06-20 20:08 ` Peter Zijlstra
2007-06-20 23:03 ` Keshavamurthy, Anil S
2007-06-21 6:10 ` Peter Zijlstra
2007-06-21 6:11 ` Arjan van de Ven
2007-06-21 6:29 ` Peter Zijlstra
2007-06-21 6:37 ` Keshavamurthy, Anil S
2007-06-21 7:13 ` Peter Zijlstra
2007-06-21 19:51 ` Keshavamurthy, Anil S
2007-06-21 6:30 ` Keshavamurthy, Anil S
2007-06-26 5:34 ` Andrew Morton
2007-06-19 21:37 ` [Intel IOMMU 07/10] Intel iommu cmdline option - forcedac Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 08/10] DMAR fault handling support Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 09/10] Iommu Gfx workaround Keshavamurthy, Anil S
2007-06-19 21:37 ` [Intel IOMMU 10/10] Iommu floppy workaround Keshavamurthy, Anil S
2007-06-26 6:42 ` Andrew Morton
2007-06-26 10:37 ` Andi Kleen
2007-06-26 19:25 ` Keshavamurthy, Anil S
2007-06-26 16:26 ` Keshavamurthy, Anil S
2007-06-26 6:45 ` [Intel IOMMU 00/10] Intel IOMMU support, take #2 Andrew Morton
2007-06-26 7:12 ` Andi Kleen
2007-06-26 11:13 ` Muli Ben-Yehuda
2007-06-26 15:03 ` Arjan van de Ven
2007-06-26 15:11 ` Muli Ben-Yehuda
2007-06-26 15:48 ` Keshavamurthy, Anil S
2007-06-26 16:00 ` Muli Ben-Yehuda
2007-06-26 15:56 ` Andi Kleen
2007-06-26 15:09 ` Muli Ben-Yehuda
2007-06-26 15:36 ` Andi Kleen
2007-06-26 15:15 ` Arjan van de Ven
2007-06-26 15:33 ` Andi Kleen
2007-06-26 16:25 ` Arjan van de Ven
2007-06-26 17:31 ` Andi Kleen
2007-06-26 20:10 ` Jesse Barnes
2007-06-26 22:35 ` Andi Kleen
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