linux_dsm_epyc7002/arch/tile
Darrick J. Wong ffecfd1a72 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>
2013-02-21 17:22:20 -08:00
..
configs netfilter: remove xt_NOTRACK 2012-09-03 13:36:40 +02:00
gxio arch/tile: provide kernel support for the tilegx USB shim 2012-07-18 16:40:24 -04:00
include tile: fix memcpy_*io functions for allnoconfig 2013-02-08 13:20:40 -05:00
kernel tile: tag some code with #ifdef CONFIG_COMPAT 2013-02-08 13:20:43 -05:00
kvm virtio: expose for non-virtualization users too 2011-07-23 16:20:30 +09:30
lib tile: export a handful of symbols appropriately 2013-02-08 13:20:36 -05:00
mm tile: export a handful of symbols appropriately 2013-02-08 13:20:36 -05:00
Kbuild arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
Kconfig block: optionally snapshot page contents to provide stable pages during write 2013-02-21 17:22:20 -08:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Makefile arch/tile: avoid generating .eh_frame information in modules 2012-10-23 10:21:43 -04:00