From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750781AbbEQPs4 (ORCPT ); Sun, 17 May 2015 11:48:56 -0400 Received: from mail-wi0-f172.google.com ([209.85.212.172]:38376 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750757AbbEQPsr (ORCPT ); Sun, 17 May 2015 11:48:47 -0400 From: Gabriele Mazzotta 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 Message-ID: <3301457.KOfdo1KMTP@xps13> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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