On Mon, 2023-10-09 at 10:47 +0530, Srikar Dronamraju wrote:
Hi Srikar,
Benchmarked this patch on baremetal POWER9 node by launching KVM to
observe the improvements achieved in KVM with the patched kernel.
Below, you can find the schbench latency result comparision.
System was running on SMT4 mod
On Mon, 2023-09-25 at 10:36 +0530, Aboorva Devarajan wrote:
Gentle ping to check if there are any feedback or comments on this
patch-set.
Thanks
Aboorva
> On Mon, 2023-09-11 at 11:06 +0530, Aboorva Devarajan wrote:
>
> CC'ing CPUidle lists and maintainers,
>
> Patch Summar
On Mon, 2023-09-11 at 11:06 +0530, Aboorva Devarajan wrote:
CC'ing CPUidle lists and maintainers,
Patch Summary:
The patchset introduces a kernel module and userspace driver designed
for estimating the wakeup latency experienced when waking up from
various CPU idle states. It primarily mea
On Wed, 2023-09-13 at 08:54 +1000, Michael Ellerman wrote:
> Aboorva Devarajan writes:
> > From: Pratik R. Sampat
> >
> > Introduce a mechanism to fire directed IPIs from a source CPU to a
> > specified target CPU and measure the time incurred on waking up the
g/selftest/powerpc/cpuidle_latency/
$ sudo ./cpuidle_latency.sh
Reviewed-by: Srikar Dronamraju
Signed-off-by: Pratik R. Sampat
Signed-off-by: Aboorva Devarajan
---
tools/testing/selftests/powerpc/Makefile | 1 +
.../powerpc/cpuidle_latency/.gitignore| 2 +
.../powerpc/cpuidl
wakeup the CPU.
Define a simple debugfs interface that allows for adjusting the
settings to trigger IPI and timer events on a designated CPU, and to
observe the resulting cpuidle wakeup latencies.
Reviewed-by: Srikar Dronamraju
Signed-off-by: Pratik R. Sampat
Signed-off-by: Aboorva Devarajan
988
# Observed Avg timeout diff(ns) - State stop5: 959137
Aboorva Devarajan (2):
powerpc/cpuidle: cpuidle wakeup latency based on IPI and timer events
powerpc/selftest: Add support for cpuidle latency measurement
arch/powerpc/Kconfig.debug| 10 +
arch/powerpc/kernel/Makef
g/selftest/powerpc/cpuidle_latency/
$ sudo ./cpuidle_latency.sh
Signed-off-by: Pratik R. Sampat
Signed-off-by: Aboorva Devarajan
Reviewed-by: Shrikanth Hegde
---
tools/testing/selftests/powerpc/Makefile | 1 +
.../powerpc/cpuidle_latency/.gitignore| 2 +
.../powerpc/cpuidl
137
Aboorva Devarajan (2):
powerpc/cpuidle: cpuidle wakeup latency based on IPI and timer events
powerpc/selftest: Add support for cpuidle latency measurement
arch/powerpc/Kconfig.debug| 10 +
arch/powerpc/kernel/Makefile | 1 +
arch/powerpc/ker
wakeup the CPU.
Define a simple debugfs interface that allows for adjusting the
settings to trigger IPI and timer events on a designated CPU, and to
observe the resulting cpuidle wakeup latencies.
Signed-off-by: Pratik R. Sampat
Signed-off-by: Aboorva Devarajan
Reviewed-by: Shrikanth Hegde
CPU Hotplug smt=off operation on a maximum configuration ppc64le system
with 1920 logical CPUs takes more than 59 minutes to complete.
Several attempts made to reduce the time consumption of CPU hotplug
operation is discussed in this thread below:
https://lore.kernel.org/all/y01uwql2y2r69...@li-05
51bf98c6
("cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol")
- Fix wakeup stats in governor for polling states
commit 5f26bdceb9c0
("cpuidle: menu: Fix wakeup statistics updates for polling state")
Signed-off-by: Aboorva Devarajan
---
Changelog: (v1 -> v2)
commit dc2251bf98c6
("cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol")
- Fix wakeup stats in governor for polling states
commit 5f26bdceb9c0
("cpuidle: menu: Fix wakeup statistics updates for polling state")
Signed-off-by: Aboorva Devarajan
---
drivers/cpuidle/cpui
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