f4c594da94
This patch fixes 2 issues with the DMU free throttle implemented in dmu_free_long_range(). The first issue is that get_next_chunk() was calculating the number of L1 blocks the free would dirty incorrectly. In some cases involving extremely large files, this code would greatly overestimate the number of effected L1 blocks, causing excessive calls to txg_wait_open(). This patch corrects the calculation. The second issue is that the free throttle uses the total number of free'd blocks in all (open, quiescing, and syncing) txgs to determine whether to throttle. This causes large frees (such as those created by the first issue) to cause 4 txg syncs before any further frees were allowed to proceed. This patch ensures that the accounting is done entirely in a per-txg fashion, so that frees from a given txg don't affect those that immediately follow it. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Tom Caputi <tcaputi@datto.com> Closes #8655 |
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README.md
ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.
Release
ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported kernel versions.