Date: Sat, 19 Oct 2002 22:32:50 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: hackers@freebsd.org Subject: adding a delay before background fsck Message-ID: <20021019223250.A14311@Odin.AC.HMC.Edu>
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[-- Attachment #1 --]
Please comment on the following patch to add a delay before starting
background fsck. The issues this addresses is that it takes a long time
to start X or other large apps like mozilla while a background fsck
is running (at least on my laptop). Once they are up and in cache,
performance is slightly bumpy, but acceptable. Thus, being able to set
a delay (I use 120s) to allow those applications to be started, makes
background fsck much more useful. I suspect this feature would also be
useful in aiding recover on servers.
-- Brooks
Index: share/man/man5/rc.conf.5
===================================================================
RCS file: /usr/cvs/src/share/man/man5/rc.conf.5,v
retrieving revision 1.164
diff -u -p -r1.164 rc.conf.5
--- share/man/man5/rc.conf.5 5 Sep 2002 20:19:03 -0000 1.164
+++ share/man/man5/rc.conf.5 20 Oct 2002 05:21:36 -0000
@@ -729,6 +729,11 @@ If set to
the system will attempt to run
.Xr fsck 8
in the background where possible.
+.It Va background_fsck_delay
+.Pq Vt int
+The amount of time in seconds to sleep before starting a background fsck.
+Setting this to a non-zero number may allow large applications such as
+the X server to start before disk I/O bandwidth is monopolized by fsck.
.It Va extra_netfs_types
.Pq Vt str
If set to something other than
Index: etc/defaults/rc.conf
===================================================================
RCS file: /usr/cvs/src/etc/defaults/rc.conf,v
retrieving revision 1.159
diff -u -p -r1.159 rc.conf
--- etc/defaults/rc.conf 5 Sep 2002 20:14:40 -0000 1.159
+++ etc/defaults/rc.conf 9 Oct 2002 23:12:49 -0000
@@ -39,6 +39,7 @@ script_name_sep=" " # Change if your sta
rc_conf_files="/etc/rc.conf /etc/rc.conf.local"
fsck_y_enable="NO" # Set to YES to do fsck -y if the initial preen fails.
background_fsck="YES" # Attempt to run fsck in the background where possible.
+background_fsck_delay="0" # Time to wait (seconds) before starting the fsck.
extra_netfs_types="NO" # List of network extra filesystem types for delayed
# mount at startup (or NO).
Index: etc/rc.d/bgfsck
===================================================================
RCS file: /usr/cvs/src/etc/rc.d/bgfsck,v
retrieving revision 1.2
diff -u -p -r1.2 bgfsck
--- etc/rc.d/bgfsck 28 Jul 2002 03:38:10 -0000 1.2
+++ etc/rc.d/bgfsck 9 Oct 2002 23:31:45 -0000
@@ -11,9 +11,20 @@
name="background-fsck"
rcvar="background_fsck"
-start_precmd="echo 'Starting background file system checks.'"
-start_cmd="nice -4 fsck -B -p 2>&1 | logger -p daemon.notice &"
+start_cmd="bgfsck_start"
stop_cmd=":"
+
+bgfsck_start ()
+{
+ bgfsck_msg='Starting background file system checks'
+ if [ ${background_fsck_delay:=0} -gt 0 ]; then
+ bgfsck_msg="${bgfsck_msg} in ${background_fsck_delay} seconds"
+ fi
+ echo "${bgfsck_msg}."
+
+ (sleep ${background_fsck_delay}; nice -4 fsck -B -p) 2>&1 | \
+ logger -p daemon.notice &
+}
load_rc_config $name
run_rc_command "$1"
Index: etc/rc
===================================================================
RCS file: /usr/cvs/src/etc/rc,v
retrieving revision 1.322
diff -u -p -r1.322 rc
--- etc/rc 12 Oct 2002 07:21:18 -0000 1.322
+++ etc/rc 20 Oct 2002 05:24:06 -0000
@@ -982,8 +982,14 @@ esac
# Start background fsck checks if necessary
case ${background_fsck} in
[Yy][Ee][Ss])
- echo 'Starting background filesystem checks'
- nice -4 fsck -B -p 2>&1 | logger -p daemon.notice &
+ bgfsck_msg='Starting background file system checks'
+ if [ ${background_fsck_delay:=0} -gt 0 ]; then
+ bgfsck_msg="${bgfsck_msg} in ${background_fsck_delay} seconds"
+ fi
+ echo "${bgfsck_msg}."
+
+ (sleep ${background_fsck_delay}; nice -4 fsck -B -p) 2>&1 | \
+ logger -p daemon.notice &
;;
esac
--
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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