diff options
author | Brian Silverman | 2015-02-18 16:23:56 -0800 |
---|---|---|
committer | Ingo Molnar | 2015-03-23 10:47:55 +0100 |
commit | 746db9443ea57fd9c059f62c4bfbf41cf224fe13 (patch) | |
tree | c6382d0f1777cd76cdb08dde8a6fad9359548eb6 /include/linux/irq_work.h | |
parent | bc465aa9d045feb0e13b4a8f32cc33c1943f62d6 (diff) |
sched: Fix RLIMIT_RTTIME when PI-boosting to RT
When non-realtime tasks get priority-inheritance boosted to a realtime
scheduling class, RLIMIT_RTTIME starts to apply to them. However, the
counter used for checking this (the same one used for SCHED_RR
timeslices) was not getting reset. This meant that tasks running with a
non-realtime scheduling class which are repeatedly boosted to a realtime
one, but never block while they are running realtime, eventually hit the
timeout without ever running for a time over the limit. This patch
resets the realtime timeslice counter when un-PI-boosting from an RT to
a non-RT scheduling class.
I have some test code with two threads and a shared PTHREAD_PRIO_INHERIT
mutex which induces priority boosting and spins while boosted that gets
killed by a SIGXCPU on non-fixed kernels but doesn't with this patch
applied. It happens much faster with a CONFIG_PREEMPT_RT kernel, and
does happen eventually with PREEMPT_VOLUNTARY kernels.
Signed-off-by: Brian Silverman <brian@peloton-tech.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: austin@peloton-tech.com
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/1424305436-6716-1-git-send-email-brian@peloton-tech.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/irq_work.h')
0 files changed, 0 insertions, 0 deletions