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Alexander Motin c1b5869bab
Introduce dsl_dir_diduse_transfer_space() 
Most of dsl_dir_diduse_space() and dsl_dir_transfer_space() CPU time
is a dd_lock overhead and time spent in dmu_buf_will_dirty(). Calling
them one after another is a waste of time and even more contention.
Doing that twice for each rewritten block within dbuf_write_done()
via dsl_dataset_block_kill() and dsl_dataset_block_born() created one
of the biggest CPU overheads in case of small blocks rewrite.

dsl_dir_diduse_transfer_space() combines functionality of these two
functions for cases where it is needed, but without double overhead,
practically for the cost of dsl_dir_diduse_space() or even cheaper.

While there, optimize dsl_dir_phys() calls in dsl_dir_diduse_space()
and dsl_dir_transfer_space().  It seems Clang detects some aliasing
there, repeating dd->dd_dbuf->db_data dereference multiple times,
increasing dd_lock scope and contention.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Author: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12300
2021-07-16 13:39:24 -06:00
.github Update bug report template 2021-07-12 14:05:50 -06:00
cmd Use substantially more robust program exit status logic in zvol_id 2021-07-02 13:10:36 -07:00
config config/libatomic: require -latomic iff atomic.c doesn't link w/o it 2021-07-13 13:50:48 -07:00
contrib
etc
include Introduce dsl_dir_diduse_transfer_space() 2021-07-16 13:39:24 -06:00
lib pass handle to do_unmount() 2021-07-15 12:31:00 -06:00
man Fix ARC ghost states eviction accounting 2021-07-13 09:41:59 -06:00
module Introduce dsl_dir_diduse_transfer_space() 2021-07-16 13:39:24 -06:00
rpm
scripts
tests ZED: Match added disk by pool/vdev GUID if found (#12217) 2021-06-30 07:37:20 -07:00
udev Udev rules: remove zvol compat symlinks (without the leading zvol/) 2021-07-06 13:41:17 -07:00
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README.md

img

OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.