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From: Nathan Lynch <nathanl@linux.ibm.com>
To: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Cc: Tyrel Datwyler <tyreld@linux.ibm.com>,
	linux-kernel@vger.kernel.org,
	Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/3] pseries: Track and expose idle PURR and SPURR ticks
Date: Wed, 04 Dec 2019 16:24:10 -0600
Message-ID: <87r21ju3ud.fsf@linux.ibm.com> (raw)
In-Reply-To: <1574856072-30972-1-git-send-email-ego@linux.vnet.ibm.com>

"Gautham R. Shenoy" <ego@linux.vnet.ibm.com> writes:
> From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
>
> On PSeries LPARs, the data centers planners desire a more accurate
> view of system utilization per resource such as CPU to plan the system
> capacity requirements better. Such accuracy can be obtained by reading
> PURR/SPURR registers for CPU resource utilization.
>
> Tools such as lparstat which are used to compute the utilization need
> to know [S]PURR ticks when the cpu was busy or idle. The [S]PURR
> counters are already exposed through sysfs.  We already account for
> PURR ticks when we go to idle so that we can update the VPA area. This
> patchset extends support to account for SPURR ticks when idle, and
> expose both via per-cpu sysfs files.

Does anything really want to use PURR instead of SPURR? Seems like we
should expose only SPURR idle values if possible.

  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 12:01 Gautham R. Shenoy
2019-11-27 12:01 ` [PATCH 1/3] powerpc/pseries: Account for SPURR ticks on idle CPUs Gautham R. Shenoy
2019-12-03 13:39   ` Kamalesh Babulal
2019-12-04 22:24   ` Nathan Lynch
2019-11-27 12:01 ` [PATCH 2/3] powerpc/sysfs: Show idle_purr and idle_spurr for every CPU Gautham R. Shenoy
2019-12-03 13:37   ` Kamalesh Babulal
2019-12-04 12:37     ` Gautham R Shenoy
2019-12-03 21:02   ` kbuild test robot
2019-12-04 22:24   ` Nathan Lynch
2019-12-05 16:53   ` Naveen N. Rao
2019-11-27 12:01 ` [PATCH 3/3] Documentation: Document sysfs interfaces purr, spurr, idle_purr, idle_spurr Gautham R. Shenoy
2019-12-04 22:25   ` Nathan Lynch
2019-12-04 22:24 ` Nathan Lynch [this message]
2019-12-05 15:03   ` [PATCH 0/3] pseries: Track and expose idle PURR and SPURR ticks Kamalesh Babulal
2019-12-05 16:16     ` Nathan Lynch
2019-12-05 17:25       ` Naveen N. Rao
2019-12-06  9:14         ` Naveen N. Rao

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