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Brian Behlendorf 2092cf68d8 Disable vmalloc() direct reclaim 
As part of vmalloc() a __pte_alloc_kernel() allocation may occur.  This
internal allocation does not honor the gfp flags passed to vmalloc().
This means even when vmalloc(GFP_NOFS) is called it is possible that a
synchronous reclaim will occur.  This reclaim can trigger file IO which
can result in a deadlock.  This issue can be avoided by explicitly
setting PF_MEMALLOC on the process to subvert synchronous reclaim when
vmalloc() is called with !__GFP_FS.

An example stack of the deadlock can be found here (1), along with the
upstream kernel bug (2), and the original bug discussion on the
linux-mm mailing list (3).  This code can be properly autoconf'ed
when the upstream bug is fixed.

1) http://github.com/behlendorf/zfs/issues/labels/Vmalloc#issue/133
2) http://bugzilla.kernel.org/show_bug.cgi?id=30702
3) http://marc.info/?l=linux-mm&m=128942194520631&w=4
2011-03-20 15:12:08 -07:00
cmd Support custom build directories 2010-09-05 21:49:05 -07:00
config Make Missing Modules.symvers Fatal 2011-03-07 13:09:01 -08:00
include Remove default GFP_NOFS allocations 2011-03-19 14:50:39 -07:00
lib Support custom build directories 2010-09-05 21:49:05 -07:00
module Disable vmalloc() direct reclaim 2011-03-20 15:12:08 -07:00
patches Reimplement rwlocks for Linux lock profiling/analysis. 2009-09-18 16:09:47 -07:00
scripts Add zlib regression test 2011-02-25 16:56:46 -08:00
.gitignore Ignore unsigned module build products 2010-03-11 14:29:17 -08:00
AUTHORS Public Release Prep 2010-05-17 15:18:00 -07:00
autogen.sh Public Release Prep 2010-05-17 15:18:00 -07:00
ChangeLog Prep for spl-0.5.0 tag 2010-08-13 09:33:50 -07:00
configure Make Missing Modules.symvers Fatal 2011-03-07 13:09:01 -08:00
configure.ac Support custom build directories 2010-09-05 21:49:05 -07:00
COPYING Public Release Prep 2010-05-17 15:18:00 -07:00
DISCLAIMER Public Release Prep 2010-05-17 15:18:00 -07:00
INSTALL Public Release Prep 2010-05-17 15:18:00 -07:00
Makefile.am Support custom build directories 2010-09-05 21:49:05 -07:00
Makefile.in Support custom build directories 2010-09-05 21:49:05 -07:00
META Prep spl-0.6.0-rc2 tag 2011-03-09 15:16:10 -08:00
README.markdown Fix markdown rendering 2010-09-15 09:05:34 -07:00
spl_config.h.in Linux compat 2.6.37, invalidate_inodes() 2011-02-23 12:44:32 -08:00
spl-modules.spec.in Minor spec file cleanup for RHEL6 package dependency. 2010-05-21 11:53:49 -07:00
spl.spec.in Remove usage of the __id_u macro for portability. 2009-10-05 12:51:58 -07:00

README.markdown

The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.

To build packages for your distribution:

$ ./configure
$ make pkg

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