mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-26 11:19:32 +03:00
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 |
||
|---|---|---|
| .. | ||
| avl | ||
| icp | ||
| lua | ||
| nvpair | ||
| spl | ||
| unicode | ||
| zcommon | ||
| zfs | ||
| .gitignore | ||
| Makefile.in | ||