diff options
| author | Daniel Bristot de Oliveira <bristot@redhat.com> | 2020-09-21 16:39:49 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-09-25 14:23:24 +0200 |
| commit | 2586af1ac187f6b3a50930a4e33497074e81762d (patch) | |
| tree | 19fae78c3453ad4c23989525856a2c6b540bb35e /kernel/sched | |
| parent | 46fcc4b00c3cca8adb9b7c9afdd499f64e427135 (diff) | |
| download | linux-stable-2586af1ac187f6b3a50930a4e33497074e81762d.tar.gz linux-stable-2586af1ac187f6b3a50930a4e33497074e81762d.tar.bz2 linux-stable-2586af1ac187f6b3a50930a4e33497074e81762d.zip | |
sched/rt: Disable RT_RUNTIME_SHARE by default
The RT_RUNTIME_SHARE sched feature enables the sharing of rt_runtime
between CPUs, allowing a CPU to run a real-time task up to 100% of the
time while leaving more space for non-real-time tasks to run on the CPU
that lend rt_runtime.
The problem is that a CPU can easily borrow enough rt_runtime to allow
a spinning rt-task to run forever, starving per-cpu tasks like kworkers,
which are non-real-time by design.
This patch disables RT_RUNTIME_SHARE by default, avoiding this problem.
The feature will still be present for users that want to enable it,
though.
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Wei Wang <wvw@google.com>
Link: https://lkml.kernel.org/r/b776ab46817e3db5d8ef79175fa0d71073c051c7.1600697903.git.bristot@redhat.com
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/features.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 7481cd96f391..68d369cba9e4 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -77,7 +77,7 @@ SCHED_FEAT(WARN_DOUBLE_CLOCK, false) SCHED_FEAT(RT_PUSH_IPI, true) #endif -SCHED_FEAT(RT_RUNTIME_SHARE, true) +SCHED_FEAT(RT_RUNTIME_SHARE, false) SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) |