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There is potential for deadlock in the l2arc_feed thread if KM_PUSHPAGE is not used for the allocations made in l2arc_write_buffers. Specifically, if KM_PUSHPAGE is not used for these allocations, it is possible for reclaim to be triggered which can cause the l2arc_feed thread to deadlock itself on the ARC_mru mutex. An example of this is demonstrated in the following backtrace of the l2arc_feed thread: crash> bt 4123 PID: 4123 TASK: ffff88062f8c1500 CPU: 6 COMMAND: "l2arc_feed" 0 [ffff88062511d610] schedule at ffffffff814eeee0 1 [ffff88062511d6d8] __mutex_lock_slowpath at ffffffff814f057e 2 [ffff88062511d748] mutex_lock at ffffffff814f041b 3 [ffff88062511d768] arc_evict at ffffffffa05130ca [zfs] 4 [ffff88062511d858] arc_adjust at ffffffffa05139a9 [zfs] 5 [ffff88062511d878] arc_shrink at ffffffffa0513a95 [zfs] 6 [ffff88062511d898] arc_kmem_reap_now at ffffffffa0513be8 [zfs] 7 [ffff88062511d8c8] arc_shrinker_func at ffffffffa0513ccc [zfs] 8 [ffff88062511d8f8] shrink_slab at ffffffff8112a17a 9 [ffff88062511d958] do_try_to_free_pages at ffffffff8112bfdf 10 [ffff88062511d9e8] try_to_free_pages at ffffffff8112c3ed 11 [ffff88062511da98] __alloc_pages_nodemask at ffffffff8112431d 12 [ffff88062511dbb8] kmem_getpages at ffffffff8115e632 13 [ffff88062511dbe8] fallback_alloc at ffffffff8115f24a 14 [ffff88062511dc68] ____cache_alloc_node at ffffffff8115efc9 15 [ffff88062511dcc8] __kmalloc at ffffffff8115fbf9 16 [ffff88062511dd18] kmem_alloc_debug at ffffffffa047b8cb [spl] 17 [ffff88062511dda8] l2arc_feed_thread at ffffffffa0511e71 [zfs] 18 [ffff88062511dea8] thread_generic_wrapper at ffffffffa047d1a1 [spl] 19 [ffff88062511dee8] kthread at ffffffff81090a86 20 [ffff88062511df48] kernel_thread at ffffffff8100c14a Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> |
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cmd | ||
config | ||
dracut | ||
etc | ||
include | ||
lib | ||
man | ||
module | ||
patches | ||
scripts | ||
udev | ||
.gitignore | ||
AUTHORS | ||
autogen.sh | ||
ChangeLog | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYRIGHT | ||
DISCLAIMER | ||
Makefile.am | ||
Makefile.in | ||
META | ||
OPENSOLARIS.LICENSE | ||
PKGBUILD-zfs-modules.in | ||
PKGBUILD-zfs.in | ||
README.markdown | ||
zfs_config.h.in | ||
zfs-modules.spec.in | ||
zfs-script-config.sh.in | ||
ZFS.RELEASE | ||
zfs.spec.in |
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