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freebsd kernel with SKQ
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jpaetzel 4c97ff8bf5 MFV 316895 
7606 dmu_objset_find_dp() takes a long time while importing pool

illumos/illumos-gate@7588687e6b
7588687e6b

https://www.illumos.org/issues/7606
  When importing a pool with a large number of filesystems within the same
  parent filesystem, we see that dmu_objset_find_dp() takes a long time.
  It is called from 3 places: spa_check_logs(), spa_ld_claim_log_blocks(),
  and spa_load_verify().
  There are several ways to improve performance here:
  1. We don't really need to do spa_check_logs() or
         spa_ld_claim_log_blocks() if the pool was closed cleanly.
  2. spa_load_verify() uses dmu_objset_find_dp() to check that no
         datasets have too long of names.
  3. dmu_objset_find_dp() is slow because it's doing
         zap_value_search() (which is O(N sibling datasets)) to determine
         the name of each dsl_dir when it's opened. In this case we
         actually know the name when we are opening it, so we can provide
         it and avoid the lookup.
  This change implements fix #3 from the above list; i.e. make
  dmu_objset_find_dp() provide the name of the dataset so that we don't
  have to search for it.

Reviewed by: Steve Gonczi <steve.gonczi@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prashanth Sreenivasa <prashksp@gmail.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
Author: Matthew Ahrens <mahrens@delphix.com>
2017-04-27 15:10:45 +00:00
bin sh: Add tests for NUL byte in command substitution output. 2017-04-23 21:58:17 +00:00
cddl MFV 316894 2017-04-25 17:57:43 +00:00
contrib Pull in r294458 from upstream llvm trunk (by Sanne Wouda): 2017-04-26 19:33:56 +00:00
crypto Fix linking with lld by marking OPENSSL_armcap_P as hidden. 2017-04-07 12:41:57 +00:00
etc Remove NATM configuration bits and assorted NATM and ATM remnants. 2017-04-25 21:59:34 +00:00
gnu Add a new GDB_LIBEXEC option to install gdb and kgdb to /usr/libexec. 2017-04-25 18:08:56 +00:00
include Remove the NATM framework including the en(4), fatm(4), hatm(4), and 2017-04-24 21:21:49 +00:00
kerberos5 kerberos5: normalize paths using SRCTOP-relative paths or :H when possible 2017-03-04 11:34:36 +00:00
lib Make cached Bluetooth LE host advertise information visible from userland. 2017-04-27 15:03:24 +00:00
libexec - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
release Add sysutils/tmux to the DVD package set 2017-04-24 16:37:25 +00:00
rescue Remove NATM configuration bits and assorted NATM and ATM remnants. 2017-04-25 21:59:34 +00:00
sbin Remove the NATM framework including the en(4), fatm(4), hatm(4), and 2017-04-24 21:21:49 +00:00
secure Upgrade to OpenSSH 7.4p1. 2017-03-06 01:37:05 +00:00
share Add information about device nodes to man pages for USB serial drivers. 2017-04-26 19:51:10 +00:00
sys MFV 316895 2017-04-27 15:10:45 +00:00
targets META_MODE: add additional reachover relative paths to DIRDEPS_BUILD 2017-04-07 07:46:21 +00:00
tests Remove the unportable -msse4 here too after fixing crc32_sse42.c to not 2017-04-02 09:24:58 +00:00
tools Fix build of tools/tools/umastat. 2017-04-26 17:58:10 +00:00
usr.bin Remove NATM configuration bits and assorted NATM and ATM remnants. 2017-04-25 21:59:34 +00:00
usr.sbin Make cached Bluetooth LE host advertise information visible from userland. 2017-04-27 15:03:24 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint
COPYRIGHT Bump copyright year. 2016-12-31 12:41:42 +00:00
LOCKS
MAINTAINERS Due to time constraints remove myself as a vmm(4) maintainer. 2017-04-15 22:42:23 +00:00
Makefile Cache compiler metadata and reuse it at installworld time. 2017-04-13 22:07:34 +00:00
Makefile.inc1 Replace again GNU diff with BSD diff 2017-04-20 19:24:51 +00:00
Makefile.libcompat META_MODE: Fix build-tools still sometimes rebuilding during target build. 2017-04-06 18:21:59 +00:00
ObsoleteFiles.inc Remove the cy(4) driver for Cyclades serial adapters. 2017-04-26 18:23:09 +00:00
README README: remove nonexistent 'games' directory. 2016-05-18 10:43:13 +00:00
README.md Remove hard line breaks from README.md 2017-03-01 15:39:58 +00:00
UPDATING Revert r317432 and add a new entry for r316527. 2017-04-26 16:50:54 +00:00

README.md

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information).

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables.

The buildkernel and installkernel targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information.

Note: If you want to build and install the kernel with the buildkernel and installkernel targets, you might need to build world before. More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used.

Source Roadmap:

bin				System/user commands.

cddl			Various commands and libraries under the Common Development  
				and Distribution License.

contrib			Packages contributed by 3rd parties.

crypto			Cryptography stuff (see crypto/README).

etc				Template files for /etc.

gnu				Various commands and libraries under the GNU Public License.  
				Please see gnu/COPYING* for more information.

include			System include files.

kerberos5		Kerberos5 (Heimdal) package.

lib				System libraries.

libexec			System daemons.

release			Release building Makefile & associated tools.

rescue			Build system for statically linked /rescue utilities.

sbin			System commands.

secure			Cryptographic libraries and commands.

share			Shared resources.

sys				Kernel sources.

tests			Regression tests which can be run by Kyua.  See tests/README
				for additional information.

tools			Utilities for regression testing and miscellaneous tasks.

usr.bin			User commands.

usr.sbin		System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html