linux-kernel - Re: [PATCH 1/3] powerpc/pseries: Account for SPURR ticks on idle CPUs

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Date:   Tue, 3 Dec 2019 19:09:48 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] powerpc/pseries: Account for SPURR ticks on idle CPUs

On 11/27/19 5:31 PM, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
> 
> On PSeries LPARs, to compute the utilization, tools such as lparstat
> need to know the [S]PURR ticks when the CPUs were busy or idle.
> 
> In the pseries cpuidle driver, we keep track of the idle PURR ticks in
> the VPA variable "wait_state_cycles". This patch extends the support
> to account for the idle SPURR ticks.

Thanks for working on it.

> 
> Signed-off-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>

Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>