linux-kernel - Re: [PATCH v5 0/5] Track and expose idle PURR and SPURR ticks

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Message-ID: <877dy92cgs.fsf@linux.ibm.com>
Date:   Tue, 21 Apr 2020 08:30:11 -0500
From:   Nathan Lynch <nathanl@...ux.ibm.com>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>
Subject: Re: [PATCH v5 0/5] Track and expose idle PURR and SPURR ticks

"Gautham R. Shenoy" <ego@...ux.vnet.ibm.com> writes:
> This is the fifth version of the patches to track and expose idle PURR
> and SPURR ticks. These patches are required by tools such as lparstat
> to compute system utilization for capacity planning purposes.
>
> The previous versions can be found here:
> v4: https://lkml.org/lkml/2020/3/27/323
> v3: https://lkml.org/lkml/2020/3/11/331
> v2: https://lkml.org/lkml/2020/2/21/21
> v1: https://lore.kernel.org/patchwork/cover/1159341/
>
> They changes from v4 are:
>
>    - As suggested by Naveen, moved the functions read_this_idle_purr()
>      and read_this_idle_spurr() from Patch 2 and Patch 3 respectively
>      to Patch 4 where it is invoked.
>
>    - Dropped Patch 6 which cached the values of purr, spurr,
>      idle_purr, idle_spurr in order to minimize the number of IPIs
>      sent.
>
>    - Updated the dates for the idle_purr, idle_spurr in the
>      Documentation Patch 5.

LGTM

Acked-by: Nathan Lynch <nathanl@...ux.ibm.com>

Thanks.