summaryrefslogtreecommitdiff
path: root/COPYING
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2007-03-25 14:31:17 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-25 14:57:34 -0700
commit9501b6cf5541f0d576d566a463f1e7d3eaaab4eb (patch)
tree7983c4cc3c82e465cfe88a7fd67e39dbed72e1e0 /COPYING
parent317ec6cd00f25d05d153a780bc178c5335f320ee (diff)
downloadlinux-3.10-9501b6cf5541f0d576d566a463f1e7d3eaaab4eb.tar.gz
linux-3.10-9501b6cf5541f0d576d566a463f1e7d3eaaab4eb.tar.bz2
linux-3.10-9501b6cf5541f0d576d566a463f1e7d3eaaab4eb.zip
[PATCH] dynticks: fix hrtimer rounding error in next_timer_interrupt
The rework of next_timer_interrupt() fixed the timer wheel bugs, but invented a rounding error versus the next hrtimer event. This is caused by the conversion of the hrtimer internal representation to relative jiffies. This causes bug #8100: http://bugzilla.kernel.org/show_bug.cgi?id=8100 next_timer_interrupt() returns "now" in such a case and causes the code in tick_nohz_stop_sched_tick() to trigger the timer softirq, which is bogus as no timer is due for expiry. This results in an endless context switching between idle and ksoftirqd until a timer is due for expiry. Modify the hrtimer evaluation so that, it returns now + 1, when the conversion results in a delta < 1 jiffie. It's confirmed to resolve bug #8100 Reported-by: Emil Karlson <jkarlson@cc.hut.fi> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions