Date: Sat, 9 Jan 2010 01:46:38 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src UPDATING src/share/man/man9 sleepqueue.9 src/sys/conf NOTES options src/sys/kern kern_clock.c subr_sleepqueue.c subr_turnstile.c src/sys/sys proc.h sleepqueue.h Message-ID: <201001090149.o091nP19068686@repoman.freebsd.org>
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attilio 2010-01-09 01:46:38 UTC
FreeBSD src repository
Modified files:
. UPDATING
share/man/man9 sleepqueue.9
sys/conf NOTES options
sys/kern kern_clock.c subr_sleepqueue.c
subr_turnstile.c
sys/sys proc.h sleepqueue.h
Log:
SVN rev 201879 on 2010-01-09 01:46:38Z by attilio
Introduce the new kernel thread called "deadlock resolver".
While the name is pretentious, a good explanation of its targets is
reported in this 17 months old presentation e-mail:
http://lists.freebsd.org/pipermail/freebsd-arch/2008-August/008452.html
In order to implement it, the sq_type in sleepqueues is mandatory and not
only compiled along with INVARIANTS option. Additively, a new sleepqueue
function, sleepq_type() is added, returning the type of the sleepqueue
linked to a wchan.
Three new sysctls are added in order to configure the thread:
debug.deadlkres.slptime_threshold
debug.deadlkres.blktime_threshold
debug.deadlkres.sleepfreq
rappresenting the thresholds for sleep and block time that will lead to
a deadlock matching (when exceeded), while the sleepfreq rappresents the
number of seconds between 2 consecutive thread runnings.
In order to enable the deadlock resolver thread recompile your kernel
with the option DEADLKRES.
Reviewed by: jeff
Tested by: pho, Giovanni Trematerra
Sponsored by: Nokia Incorporated, Sandvine Incorporated
MFC after: 2 weeks
Revision Changes Path
1.651 +5 -0 src/UPDATING
1.20 +10 -1 src/share/man/man9/sleepqueue.9
1.1570 +5 -0 src/sys/conf/NOTES
1.699 +1 -0 src/sys/conf/options
1.212 +121 -1 src/sys/kern/kern_clock.c
1.66 +25 -3 src/sys/kern/subr_sleepqueue.c
1.177 +2 -0 src/sys/kern/subr_turnstile.c
1.543 +1 -0 src/sys/sys/proc.h
1.19 +1 -0 src/sys/sys/sleepqueue.h
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