f604673836
As described in the comment above arc_adapt_thread() it is critical that the arc_adapt_thread() function never sleep while holding a hash lock. This behavior was possible in the Linux implementation because the arc_prune() logic was implemented to be synchronous. Under illumos the analogous dnlc_reduce_cache() function is asynchronous. To address this the arc_do_user_prune() function is has been reworked in to two new functions as follows: * arc_prune_async() is an asynchronous implementation which dispatches the prune callback to be run by the system taskq. This makes it suitable to use in the context of the arc_adapt_thread(). * arc_prune() is a synchronous implementation which depends on the arc_prune_async() implementation but blocks until the outstanding callbacks complete. This is used in arc_kmem_reap_now() where it is safe, and expected, that memory will be freed. This patch additionally adds the zfs_arc_meta_strategy module option while allows the meta reclaim strategy to be configured. It defaults to a balanced strategy which has been proved to work well under Linux but the illumos meta-only strategy can be enabled. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> |
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README.markdown
Native ZFS for Linux!
ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.
Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org