64c259c509
Currently every calls to zpl_posix_acl_release will schedule a delayed task, and each delayed task will add a timer. This used to be fine except for possibly bad performance impact. However, in Linux 4.8, a new timer wheel implementation[1] is introduced. In this new implementation, the larger the delay, the less accuracy the timer is. So when we have a flood of timer from zpl_posix_acl_release, they will expire at the same time. Couple with the fact that task_expire will do linear search with lock held. This causes an extreme amount of contention inside interrupt and would actually lockup the system. We fix this by doing batch free to prevent a flood of delayed task. Every call to zpl_posix_acl_release will put the posix_acl to be freed on a lockless list. Every batch window, 1 sec, the zpl_posix_acl_free will fire up and free every posix_acl that passed the grace period on the list. This way, we only have one delayed task every second. [1] https://lwn.net/Articles/646950/ Signed-off-by: Chunwei Chen <david.chen@osnexus.com> |
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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