diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2013-02-21 16:42:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-21 17:22:20 -0800 |
| commit | ffecfd1a72fccfcee3dabb99b9ecba9735318f90 (patch) | |
| tree | a5c3caf67249ec811a2c2c95678d9349fd8e2412 /arch | |
| parent | 13575ca14fcdacd1ad914d00bc63eb4d96280986 (diff) | |
| download | linux-ffecfd1a72fccfcee3dabb99b9ecba9735318f90.tar.bz2 | |
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 <darrick.wong@oracle.com>
Tested-by: Andy Lutomirski <luto@amacapital.net>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Artem Bityutskiy <dedekind1@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/tile/Kconfig | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 1bb7ad4aeff4..b1e68f52029c 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 |