From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: npiggin@gmail.com, Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: aneesh.kumar@kernel.org, naveen.n.rao@linux.ibm.com,
linuxppc-dev@lists.ozlabs.org, srikar@linux.vnet.ibm.com
Subject: Re: [PATCH] powerpc/pseries: fix accuracy of stolen time
Date: Thu, 15 Feb 2024 23:57:37 +1100 [thread overview]
Message-ID: <170800185786.599237.4673706342669525241.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20240213052635.231597-1-sshegde@linux.ibm.com>
On Tue, 13 Feb 2024 10:56:35 +0530, Shrikanth Hegde wrote:
> 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.
>
> [...]
Applied to powerpc/fixes.
[1/1] powerpc/pseries: fix accuracy of stolen time
https://git.kernel.org/powerpc/c/cbecc9fcbbec60136b0180ba0609c829afed5c81
cheers
prev parent reply other threads:[~2024-02-15 13:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-13 5:26 [PATCH] powerpc/pseries: fix accuracy of stolen time Shrikanth Hegde
2024-02-13 5:53 ` Nicholas Piggin
2024-02-13 6:12 ` Srikar Dronamraju
2024-02-15 12:57 ` Michael Ellerman [this message]
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