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691f6ac4c2
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Brian Behlendorf 691f6ac4c2 Use KM_PUSHPAGE instead of KM_SLEEP 
It used to be the case that all KM_SLEEP allocations were GFS_NOFS.
Unfortunately this often resulted in the kernel being unable to
reclaim the ARC, inode, and dentry caches in a timely manor.
The fix was to make KM_SLEEP a GFP_KERNEL allocation in the SPL.

However, this increases the posibility of deadlocking the system
on a zfs write thread.  If a zfs write thread attempts to perform
an allocation it may trigger synchronous reclaim.  This reclaim
may attempt to flush dirty data/inode to disk to free memory.
Unforunately, this write cannot finish because the write thread
which would handle it is holding the previous transaction open.
Deadlock.

To avoid this all allocations in the zfs write thread path must
use KM_PUSHPAGE which prohibits synchronous reclaim for that
thread.  In this way forward progress in ensured.  The risk
with this change is I missed updating an allocation for the
write threads leaving an increased posibility of deadlock.  If
any deadlocks remain they will be unlikely but we'll have to
make sure they all get fixed.
2011-03-22 12:14:55 -07:00
cmd Merge branch 'dracut' 2011-03-22 12:13:04 -07:00
config Add dracut support 2011-03-17 16:52:04 -07:00
dracut Add dracut support 2011-03-17 16:52:04 -07:00
etc Add init scripts 2011-03-17 16:51:54 -07:00
include Add init scripts 2011-03-17 16:51:54 -07:00
lib Merge branch 'dracut' 2011-03-22 12:13:04 -07:00
man Add init scripts 2011-03-17 16:51:54 -07:00
module Use KM_PUSHPAGE instead of KM_SLEEP 2011-03-22 12:14:55 -07:00
patches Add build system 2010-08-31 13:41:27 -07:00
scripts Add init scripts 2011-03-17 16:51:54 -07:00
.gitignore Ignore unsigned module build products 2010-03-09 14:14:09 -08:00
AUTHORS Add dracut support 2011-03-17 16:52:04 -07:00
autogen.sh Minor packaging fixes 2010-09-01 15:42:32 -07:00
ChangeLog Add build system 2010-08-31 13:41:27 -07:00
configure Add dracut support 2011-03-17 16:52:04 -07:00
configure.ac Add dracut support 2011-03-17 16:52:04 -07:00
COPYING Relocate COPYING+COPYRIGHT, remove README cruft 2008-12-01 15:34:53 -08:00
COPYRIGHT Update COPYRIGHT to reference zpios CDDL exceptions. 2010-05-18 14:25:28 -07:00
DISCLAIMER Update COPYRIGHT and DISCLAIMER. 2010-05-18 10:32:23 -07:00
Makefile.am Add dracut support 2011-03-17 16:52:04 -07:00
Makefile.in Add dracut support 2011-03-17 16:52:04 -07:00
META Prep zfs-0.6.0-rc2 tag 2011-03-09 15:26:48 -08:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix markdown rendering 2010-09-15 09:09:37 -07:00
zfs_config.h.in Linux 2.6.38 compat, blkdev_get_by_path() 2011-02-23 12:29:38 -08:00
zfs-modules.spec.in Use top level object directory in zfs-module.spec 2010-09-10 12:33:31 -07:00
zfs-script-config.sh.in Unconditionally load core kernel modules 2010-11-11 11:38:25 -08:00
ZFS.RELEASE Update to onnv_147 2010-08-26 14:24:34 -07:00
zfs.spec.in Add dracut support 2011-03-17 16:52:04 -07:00

README.markdown

Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!

$ ./configure
$ make pkg

Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org