This is a note to let you know that I've just added the patch titled
powerpc/pseries: fix accuracy of stolen time
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-fix-accuracy-of-stolen-time.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cbecc9fcbbec60136b0180ba0609c829afed5c81 Mon Sep 17 00:00:00 2001
From: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
Date: Tue, 13 Feb 2024 10:56:35 +0530
Subject: powerpc/pseries: fix accuracy of stolen time
From: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
commit cbecc9fcbbec60136b0180ba0609c829afed5c81 upstream.
powerVM hypervisor updates the VPA fields with stolen time data.
It currently reports enqueue_dispatch_tb and ready_enqueue_tb for
this purpose. In linux these two fields are used to report the stolen time.
The VPA fields are updated at the TB frequency. On powerPC its mostly
set at 512Mhz. Hence this needs a conversion to ns when reporting it
back as rest of the kernel timings are in ns. This conversion is already
handled in tb_to_ns function. So use that function to report accurate
stolen time.
Observed this issue and used an Capped Shared Processor LPAR(SPLPAR) to
simplify the experiments. In all these cases, 100% VP Load is run using
stress-ng workload. Values of stolen time is in percentages as reported
by mpstat. With the patch values are close to expected.
6.8.rc1 +Patch
12EC/12VP 0.0 0.0
12EC/24VP 25.7 50.2
12EC/36VP 37.3 69.2
12EC/48VP 38.5 78.3
Fixes: 0e8a63132800 ("powerpc/pseries: Implement CONFIG_PARAVIRT_TIME_ACCOUNTING")
Cc: stable@xxxxxxxxxxxxxxx # v6.1+
Signed-off-by: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
Reviewed-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20240213052635.231597-1-sshegde@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/pseries/lpar.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -662,8 +662,12 @@ u64 pseries_paravirt_steal_clock(int cpu
{
struct lppaca *lppaca = &lppaca_of(cpu);
- return be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
- be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb));
+ /*
+ * VPA steal time counters are reported at TB frequency. Hence do a
+ * conversion to ns before returning
+ */
+ return tb_to_ns(be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
+ be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb)));
}
#endif
Patches currently in stable-queue which might be from sshegde@xxxxxxxxxxxxx are
queue-6.6/powerpc-pseries-fix-accuracy-of-stolen-time.patch
