Devin Kim 99201509b5 nohz: Fix idle ticks in cpu summary line of /proc/stat ... Git commit 09a1d34f85 "nohz: Make idle/iowait counter update conditional" introduced a bug in regard to cpu hotplug. The effect is that the number of idle ticks in the cpu summary line in /proc/stat is still counting ticks for offline cpus. Reproduction is easy, just start a workload that keeps all cpus busy, switch off one or more cpus and then watch the idle field in top. On a dual-core with one cpu 100% busy and one offline cpu you will get something like this: %Cpu(s): 48.7 us, 1.3 sy, 0.0 ni, 50.0 id, 0.0 wa, 0.0 hi, 0.0 si, %0.0 st The problem is that an offline cpu still has ts->idle_active == 1. To fix this we should make sure that the cpu is online when calling get_cpu_idle_time_us and get_cpu_iowait_time_us. [Srivatsa: Rebased to current mainline] Change-Id: I53cd02fef784647e45abb4c99ff641e5e69a9d3e Reported-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20121010061820.8999.57245.stgit@srivatsabhat.in.ibm.com Cc: deepthi@linux.vnet.ibm.com Cc: stable@vger.kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2013-03-04 12:48:24 -08:00
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fat	fs: fat: rate limit the kernel messages	2013-02-20 02:49:28 -08:00
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proc	nohz: Fix idle ticks in cpu summary line of /proc/stat	2013-03-04 12:48:24 -08:00
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ubifs	ubifs: Fix compiler warning	2013-02-27 18:10:47 -08:00
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yaffs2	fs: yaffs2: Add null pointer check before dereferencing inode	2013-02-27 18:19:17 -08:00
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compat_ioctl.c	net: bluetooth: ioctl entry to modify auth info.	2013-02-25 11:37:16 -08:00
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fs-writeback.c	fs: block_dump: Don't display inode changes if block_dump < 2	2013-02-20 02:49:30 -08:00
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