From ffecfd1a72fccfcee3dabb99b9ecba9735318f90 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Thu, 21 Feb 2013 16:42:55 -0800 Subject: block: optionally snapshot page contents to provide stable pages during write This provides a band-aid to provide stable page writes on jbd without needing to backport the fixed locking and page writeback bit handling schemes of jbd2. The band-aid works by using bounce buffers to snapshot page contents instead of waiting. For those wondering about the ext3 bandage -- fixing the jbd locking (which was done as part of ext4dev years ago) is a lot of surgery, and setting PG_writeback on data pages when we actually hold the page lock dropped ext3 performance by nearly an order of magnitude. If we're going to migrate iscsi and raid to use stable page writes, the complaints about high latency will likely return. We might as well centralize their page snapshotting thing to one place. Signed-off-by: Darrick J. Wong Tested-by: Andy Lutomirski Cc: Adrian Hunter Cc: Artem Bityutskiy Reviewed-by: Jan Kara Cc: Joel Becker Cc: Mark Fasheh Cc: Steven Whitehouse Cc: Jens Axboe Cc: Eric Van Hensbergen Cc: Ron Minnich Cc: Latchesar Ionkov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/tile/Kconfig | 6 ------ 1 file changed, 6 deletions(-) (limited to 'arch') diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 1bb7ad4aeff..b1e68f52029 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -412,12 +412,6 @@ config TILE_USB Provides USB host adapter support for the built-in EHCI and OHCI interfaces on TILE-Gx chips. -# USB OHCI needs the bounce pool since tilegx will often have more -# than 4GB of memory, but we don't currently use the IOTLB to present -# a 32-bit address to OHCI. So we need to use a bounce pool instead. -config NEED_BOUNCE_POOL - def_bool USB_OHCI_HCD - source "drivers/pci/hotplug/Kconfig" endmenu -- cgit v1.2.3-70-g09d2