0902c4577f
Re-factor arc_read() to better account for embedded data blkptrs. Previously, reading the payload from an embedded blkptr would cause arcstats such as demand_metadata_misses to be bumped when there was actually no cache "miss" because the data are already available in the blkptr. The following test procedure was used to demonstrate the problem: zpool create tank ... zfs create -o compression=lz4 tank/fs echo blah > /tank/fs/blah stat /tank/fs/blah grep 'meta.*mis' /proc/spl/kstat/zfs/arcstats and repeating the last two steps to watch the metadata miss counter increment. This can also be demonstrated via the zfs_arc_miss DTRACE4 probe in arc_read(). Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Wilson <george.wilson@delphix.com> Reviewed-by: Matt Ahrens <mahrens@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #8319
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.