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From: Jeff Garzik <jeff@garzik.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: neilb@suse.de, linux-raid@vger.kernel.org, akpm@osdl.org,
	linux-kernel@vger.kernel.org, christopher.leech@intel.com
Subject: Re: [PATCH 02/19] raid5: move write operations to a workqueue
Date: Mon, 11 Sep 2006 19:36:49 -0400	[thread overview]
Message-ID: <4505F311.7050901@garzik.org> (raw)
In-Reply-To: <20060911231746.4737.82707.stgit@dwillia2-linux.ch.intel.com>

Dan Williams wrote:
> From: Dan Williams <dan.j.williams@intel.com>
> 
> Enable handle_stripe5 to pass off write operations to
> raid5_do_soft_blocks_ops (which can be run as a workqueue).  The operations
> moved are reconstruct-writes and read-modify-writes formerly handled by
> compute_parity5.
> 
> Changelog:
> * moved raid5_do_soft_block_ops changes into a separate patch
> * changed handle_write_operations5 to only initiate write operations, which
> prevents new writes from being requested while the current one is in flight
> * all blocks undergoing a write are now marked locked and !uptodate at the
> beginning of the write operation
> * blocks undergoing a read-modify-write need a request flag to distinguish
> them from blocks that are locked for reading. Reconstruct-writes still use
> the R5_LOCKED bit to select blocks for the operation
> * integrated the work queue Kconfig option
> 
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
> 
>  drivers/md/Kconfig         |   21 +++++
>  drivers/md/raid5.c         |  192 ++++++++++++++++++++++++++++++++++++++------
>  include/linux/raid/raid5.h |    3 +
>  3 files changed, 190 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
> index bf869ed..2a16b3b 100644
> --- a/drivers/md/Kconfig
> +++ b/drivers/md/Kconfig
> @@ -162,6 +162,27 @@ config MD_RAID5_RESHAPE
>  	  There should be enough spares already present to make the new
>  	  array workable.
>  
> +config MD_RAID456_WORKQUEUE
> +	depends on MD_RAID456
> +	bool "Offload raid work to a workqueue from raid5d"
> +	---help---
> +	  This option enables raid work (block copy and xor operations)
> +	  to run in a workqueue.  If your platform has a high context
> +	  switch penalty say N.  If you are using hardware offload or
> +	  are running on an SMP platform say Y.
> +
> +	  If unsure say, Y.
> +
> +config MD_RAID456_WORKQUEUE_MULTITHREAD
> +	depends on MD_RAID456_WORKQUEUE && SMP
> +	bool "Enable multi-threaded raid processing"
> +	default y
> +	---help---
> +	  This option controls whether the raid workqueue will be multi-
> +	  threaded or single threaded.
> +
> +	  If unsure say, Y.

In the final patch that gets merged, these configuration options should 
go away.  We are very anti-#ifdef in Linux, for a variety of reasons. 
In this particular instance, code complexity increases and 
maintainability decreases as the #ifdef forest grows.

	Jeff




  reply	other threads:[~2006-09-11 23:36 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-11 23:00 [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Dan Williams
2006-09-11 23:17 ` [PATCH 01/19] raid5: raid5_do_soft_block_ops Dan Williams
2006-09-11 23:34   ` Jeff Garzik
2006-09-11 23:17 ` [PATCH 02/19] raid5: move write operations to a workqueue Dan Williams
2006-09-11 23:36   ` Jeff Garzik [this message]
2006-09-11 23:17 ` [PATCH 03/19] raid5: move check parity " Dan Williams
2006-09-11 23:17 ` [PATCH 04/19] raid5: move compute block " Dan Williams
2006-09-11 23:18 ` [PATCH 05/19] raid5: move read completion copies " Dan Williams
2006-09-11 23:18 ` [PATCH 06/19] raid5: move the reconstruct write expansion operation " Dan Williams
2006-09-11 23:18 ` [PATCH 07/19] raid5: remove compute_block and compute_parity5 Dan Williams
2006-09-11 23:18 ` [PATCH 08/19] dmaengine: enable multiple clients and operations Dan Williams
2006-09-11 23:44   ` Jeff Garzik
2006-09-12  0:14     ` Dan Williams
2006-09-12  0:52       ` Roland Dreier
2006-09-12  6:18         ` Dan Williams
2006-09-12  9:15           ` Evgeniy Polyakov
2006-09-13  4:04           ` Jeff Garzik
2006-09-15 16:38     ` Olof Johansson
2006-09-15 19:44       ` [PATCH] dmaengine: clean up and abstract function types (was Re: [PATCH 08/19] dmaengine: enable multiple clients and operations) Olof Johansson
2006-09-15 20:02         ` [PATCH] [v2] " Olof Johansson
2006-09-18 22:56         ` [PATCH] " Dan Williams
2006-09-19  1:05           ` Olof Johansson
2006-09-19 11:20             ` Alan Cox
2006-09-19 16:32               ` Olof Johansson
2006-09-11 23:18 ` [PATCH 09/19] dmaengine: reduce backend address permutations Dan Williams
2006-09-15 14:46   ` Olof Johansson
2006-09-11 23:18 ` [PATCH 10/19] dmaengine: expose per channel dma mapping characteristics to clients Dan Williams
2006-09-11 23:18 ` [PATCH 11/19] dmaengine: add memset as an asynchronous dma operation Dan Williams
2006-09-11 23:50   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy Dan Williams
2006-09-11 23:51   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 13/19] dmaengine: add support for dma xor zero sum operations Dan Williams
2006-09-11 23:18 ` [PATCH 14/19] dmaengine: add dma_sync_wait Dan Williams
2006-09-11 23:52   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 15/19] dmaengine: raid5 dma client Dan Williams
2006-09-11 23:54   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 16/19] dmaengine: Driver for the Intel IOP 32x, 33x, and 13xx RAID engines Dan Williams
2006-09-15 14:57   ` Olof Johansson
2006-09-11 23:19 ` [PATCH 17/19] iop3xx: define IOP3XX_REG_ADDR[32|16|8] and clean up DMA/AAU defs Dan Williams
2006-09-11 23:55   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 18/19] iop3xx: Give Linux control over PCI (ATU) initialization Dan Williams
2006-09-11 23:56   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 19/19] iop3xx: IOP 32x and 33x support for the iop-adma driver Dan Williams
2006-09-11 23:38 ` [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Jeff Garzik
2006-09-11 23:53   ` Dan Williams
2006-09-12  2:41     ` Jeff Garzik
2006-09-12  5:47       ` Dan Williams
2006-09-13  4:05         ` Jeff Garzik
2006-09-13  7:15 ` Jakob Oestergaard
2006-09-13 19:17   ` Dan Williams
2006-09-14  7:42     ` Jakob Oestergaard
2006-10-11  1:46       ` Dan Williams
2006-10-08 22:18 ` Neil Brown
2006-10-10 18:23   ` Dan Williams
2006-10-11  2:44     ` Neil Brown

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