| Message ID | 20220113122153.137498-1-krzysztof.kozlowski@canonical.com |
|---|---|
| State | New |
| Headers | show |
| Series | [J/realtime] UBUNTU: [Config] realtime: enable CONFIG_RT_GROUP_SCHED | expand |
Acked-by: Tim Gardner <tim.gardner@canonical.com> There was an attempt to enable this config for Azure tuned kernels but it was reverted after noticing a regression with the ubuntu_ltp_stable sched test. Investigating that regression hasn't bubbled up to the top of my to-do list yet, so I'll be interested to know if you can root cause the regression (or fix the test). rtg On 1/13/22 5:21 AM, Krzysztof Kozlowski wrote: > The RT_GROUP_SCHED (Real-Time group scheduling) allows explicitly > allocate real CPU bandwidth to task groups. This might be useful for > workloads consisting of separate realtime tasks. > > It has however a drawback of requiring root user to allocate realtime > bandwidth for other realtime users, via the CGroup interface. > > See also: Documentation/scheduler/sched-rt-group.rst > > BugLink: https://bugs.launchpad.net/bugs/1957788 > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> > --- > debian.realtime/config/annotations | 2 ++ > debian.realtime/config/config.common.ubuntu | 2 +- > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/debian.realtime/config/annotations b/debian.realtime/config/annotations > index 82c1e5ed49ae..365230cfe657 100644 > --- a/debian.realtime/config/annotations > +++ b/debian.realtime/config/annotations > @@ -25,3 +25,5 @@ CONFIG_NO_HZ_FULL policy<{'amd64': 'y', 'arm64': ' > CONFIG_NO_HZ_FULL mark<ENFORCED> > CONFIG_RCU_NOCB_CPU policy<{'amd64': 'y', 'arm64': 'y'}> > CONFIG_RCU_NOCB_CPU mark<ENFORCED> > +CONFIG_RT_GROUP_SCHED policy<{'amd64': 'y', 'arm64': 'y'}> > +CONFIG_RT_GROUP_SCHED mark<ENFORCED> > diff --git a/debian.realtime/config/config.common.ubuntu b/debian.realtime/config/config.common.ubuntu > index f494c4d8f058..2142f943d375 100644 > --- a/debian.realtime/config/config.common.ubuntu > +++ b/debian.realtime/config/config.common.ubuntu > @@ -8526,7 +8526,7 @@ CONFIG_RTW89_DEBUG=y > CONFIG_RTW89_DEBUGFS=y > CONFIG_RTW89_DEBUGMSG=y > CONFIG_RTW89_PCI=m > -# CONFIG_RT_GROUP_SCHED is not set > +CONFIG_RT_GROUP_SCHED=y > CONFIG_RT_MUTEXES=y > CONFIG_RUNTIME_TESTING_MENU=y > CONFIG_RWSEM_SPIN_ON_OWNER=y >
On 13/01/2022 14:25, Tim Gardner wrote: > Acked-by: Tim Gardner <tim.gardner@canonical.com> > > There was an attempt to enable this config for Azure tuned kernels but > it was reverted after noticing a regression with the ubuntu_ltp_stable > sched test. Investigating that regression hasn't bubbled up to the top > of my to-do list yet, so I'll be interested to know if you can root > cause the regression (or fix the test). > Thanks for pointing this out. I'll check the issue with RT kernel. Best regards, Krzysztof
diff --git a/debian.realtime/config/annotations b/debian.realtime/config/annotations index 82c1e5ed49ae..365230cfe657 100644 --- a/debian.realtime/config/annotations +++ b/debian.realtime/config/annotations @@ -25,3 +25,5 @@ CONFIG_NO_HZ_FULL policy<{'amd64': 'y', 'arm64': ' CONFIG_NO_HZ_FULL mark<ENFORCED> CONFIG_RCU_NOCB_CPU policy<{'amd64': 'y', 'arm64': 'y'}> CONFIG_RCU_NOCB_CPU mark<ENFORCED> +CONFIG_RT_GROUP_SCHED policy<{'amd64': 'y', 'arm64': 'y'}> +CONFIG_RT_GROUP_SCHED mark<ENFORCED> diff --git a/debian.realtime/config/config.common.ubuntu b/debian.realtime/config/config.common.ubuntu index f494c4d8f058..2142f943d375 100644 --- a/debian.realtime/config/config.common.ubuntu +++ b/debian.realtime/config/config.common.ubuntu @@ -8526,7 +8526,7 @@ CONFIG_RTW89_DEBUG=y CONFIG_RTW89_DEBUGFS=y CONFIG_RTW89_DEBUGMSG=y CONFIG_RTW89_PCI=m -# CONFIG_RT_GROUP_SCHED is not set +CONFIG_RT_GROUP_SCHED=y CONFIG_RT_MUTEXES=y CONFIG_RUNTIME_TESTING_MENU=y CONFIG_RWSEM_SPIN_ON_OWNER=y
The RT_GROUP_SCHED (Real-Time group scheduling) allows explicitly allocate real CPU bandwidth to task groups. This might be useful for workloads consisting of separate realtime tasks. It has however a drawback of requiring root user to allocate realtime bandwidth for other realtime users, via the CGroup interface. See also: Documentation/scheduler/sched-rt-group.rst BugLink: https://bugs.launchpad.net/bugs/1957788 Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> --- debian.realtime/config/annotations | 2 ++ debian.realtime/config/config.common.ubuntu | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-)