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From: Gabriele Mazzotta <gabriele.mzt@gmail.com>
To: juri.lelli@arm.com, mingo@redhat.com, peterz@infradead.org
Cc: linux-kernel@vger.kernel.org, len.brown@intel.com,
	andrey.semin@intel.com
Subject: Regression: turbostat stops working after suspend/resume cycle
Date: Sun, 17 May 2015 17:48:44 +0200	[thread overview]
Message-ID: <3301457.KOfdo1KMTP@xps13> (raw)

Hi,

I've recently noticed that if I suspend and resume my laptop, I can no
longer execute turbostat. This is what I get when I try to start it:
# turbostat
Could not migrate to CPU 1
turbostat: re-initialized with num_cpus 4
Could not migrate to CPU 1

Since everything works as expected with v4.0, I ran a bisection and
found that commit 3c18d447b3b36a8d ("sched/core: Check for available
DL bandwidth in cpuset_cpu_inactive()") is the cause of the regression.

I don't know if there's something else affected by that change, but
I can consistently reproduce the bug with turbostat.

I can provide more info if needed.

Regards,
Gabriele

             reply	other threads:[~2015-05-17 15:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-17 15:48 Gabriele Mazzotta [this message]
2015-05-18  6:45 ` Regression: turbostat stops working after suspend/resume cycle Ingo Molnar
2015-05-18  7:12   ` Gabriele Mazzotta
2015-05-18  6:48 ` Regression: turbostat stops working after suspend/resume cycle\ Peter Zijlstra
2015-05-18  7:19   ` Gabriele Mazzotta

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