git: 77e1ccbee3ed - main - rc: implement parallel boot
Baptiste Daroussin
bapt at FreeBSD.org
Tue Feb 23 10:27:34 UTC 2021
The branch main has been updated by bapt:
URL: https://cgit.FreeBSD.org/src/commit/?id=77e1ccbee3ed6c837929e4e232fd07f95bfc8294
commit 77e1ccbee3ed6c837929e4e232fd07f95bfc8294
Author: Rick Parrish <unitrunker at gmail.com>
AuthorDate: 2021-02-07 06:15:21 +0000
Commit: Baptiste Daroussin <bapt at FreeBSD.org>
CommitDate: 2021-02-23 10:16:53 +0000
rc: implement parallel boot
take advantage of the rcorder -p argument to implement parallel
booting in rc.
According to the author non scientific tests:
on a Core 2 Duo with spinning disk:
| Services enabled | before | after | saving |
| 0 | 8s | 8s | 0 |
| 1 | 13s | 13s | 0 |
| 2 | 17s | 13s | 5 |
| 3 | 23s | 13s | 10 |
| 4 | 28s | 13s | 15 |
| 5 | 33s | 13s | 20 |
PR: 249192
MFC after: 3 weeks
---
libexec/rc/rc | 49 ++++++++++++++++++++++++++++++++++---------------
1 file changed, 34 insertions(+), 15 deletions(-)
diff --git a/libexec/rc/rc b/libexec/rc/rc
index 35db4a850516..722d7fe35884 100644
--- a/libexec/rc/rc
+++ b/libexec/rc/rc
@@ -91,19 +91,31 @@ if ! [ -e ${firstboot_sentinel} ]; then
skip_firstboot="-s firstboot"
fi
+# rc_parallel_start default is "NO"
+rc_parallel_start=${rc_parallel_start:-NO}
+_rc_parallel=''
+# enable rcorder -p if /etc/rc.conf rc_parallel_start is "YES"
+checkyesno rc_parallel_start && _rc_parallel='-p'
+
# Do a first pass to get everything up to $early_late_divider so that
# we can do a second pass that includes $local_startup directories
#
-files=`rcorder ${skip} ${skip_firstboot} /etc/rc.d/* 2>/dev/null`
+files=`rcorder ${skip} ${skip_firstboot} ${_rc_parallel} /etc/rc.d/* 2>/dev/null`
_rc_elem_done=' '
-for _rc_elem in ${files}; do
- run_rc_script ${_rc_elem} ${_boot}
- _rc_elem_done="${_rc_elem_done}${_rc_elem} "
-
- case "$_rc_elem" in
- */${early_late_divider}) break ;;
- esac
+IFS=$'\n'
+for _rc_group in ${files}; do
+ IFS=$' '
+ for _rc_elem in ${_rc_group}; do
+ run_rc_script ${_rc_elem} ${_boot} &
+ _rc_elem_done="${_rc_elem_done}${_rc_elem} "
+
+ case "$_rc_elem" in
+ */${early_late_divider}) break ;;
+ esac
+ done
+ wait
+ IFS=$'\n'
done
unset files local_rc
@@ -122,14 +134,21 @@ if [ -e ${firstboot_sentinel} ]; then
skip_firstboot=""
fi
-files=`rcorder ${skip} ${skip_firstboot} /etc/rc.d/* ${local_rc} 2>/dev/null`
-for _rc_elem in ${files}; do
- case "$_rc_elem_done" in
- *" $_rc_elem "*) continue ;;
- esac
-
- run_rc_script ${_rc_elem} ${_boot}
+files=`rcorder ${skip} ${skip_firstboot} /etc/rc.d/* ${local_rc} ${_rc_parallel} 2>/dev/null`
+IFS=$'\n'
+for _rc_group in ${files}; do
+ IFS=$' '
+ for _rc_elem in ${_rc_group}; do
+ case "$_rc_elem_done" in
+ *" $_rc_elem "*) continue ;;
+ esac
+
+ run_rc_script ${_rc_elem} ${_boot} &
+ done
+ wait
+ IFS=$'\n'
done
+unset IFS
# Remove the firstboot sentinel, and reboot if it was requested.
# Be a bit paranoid about removing it to handle the common failure
More information about the dev-commits-src-all
mailing list