From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: ego@linux.vnet.ibm.com
Cc: Nathan Lynch <nathanl@linux.ibm.com>,
Tyrel Datwyler <tyreld@linux.ibm.com>,
linux-kernel@vger.kernel.org,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/3] powerpc/sysfs: Show idle_purr and idle_spurr for every CPU
Date: Wed, 05 Feb 2020 12:28:49 +0530 [thread overview]
Message-ID: <1580885398.01q0jv6qlp.naveen@linux.ibm.com> (raw)
In-Reply-To: <20200205041956.GA5401@in.ibm.com>
Gautham R Shenoy wrote:
>
>> With repect to lparstat, the read interval is user-specified and just gets
>> passed onto sleep().
>
> Ok. So I guess currently you will be sending smp_call_function every
> time you read a PURR and SPURR. That number will now increase by 2
> times when we read idle_purr and idle_spurr.
Yes, not really efficient. I just wanted to point out that we can't have
stale data being returned if we choose to add another sysfs file.
We should be able to use any other interface too, if you have a
different interface in mind.
- Naveen
next prev parent reply other threads:[~2020-02-05 7:00 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-27 12:01 [PATCH 0/3] pseries: Track and expose idle PURR and SPURR ticks 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
2020-02-03 4:45 ` Gautham R Shenoy
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
2020-02-03 4:47 ` Gautham R Shenoy
2019-12-05 16:53 ` Naveen N. Rao
2020-02-03 4:50 ` Gautham R Shenoy
2020-02-04 7:52 ` Naveen N. Rao
2020-02-05 4:19 ` Gautham R Shenoy
2020-02-05 6:58 ` Naveen N. Rao [this message]
2020-02-05 7:08 ` Christophe Leroy
2020-02-05 8:07 ` 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 ` [PATCH 0/3] pseries: Track and expose idle PURR and SPURR ticks Nathan Lynch
2019-12-05 15:03 ` 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
2020-02-04 9:12 ` Kamalesh Babulal
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