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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array.c	procfs: fix /proc/statm	2012-03-28 17:14:35 -07:00
base.c	Grants system server access to /proc/<pid>/oom_adj for Android applications.	2013-02-20 02:49:30 -08:00
cmdline.c
consoles.c
cpuinfo.c
devices.c
generic.c
inode.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
internal.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl	2012-03-23 18:08:58 -07:00
interrupts.c
Kconfig
kcore.c	fs/proc/kcore.c: make get_sparsemem_vmemmap_info() static	2012-03-23 16:58:42 -07:00
kmsg.c
loadavg.c
Makefile
meminfo.c
mmu.c
namespaces.c	fs/proc/namespaces.c: prevent crash when ns_entries[] is empty	2012-03-28 17:14:37 -07:00
nommu.c
page.c	pagemap: export KPF_THP	2012-03-21 17:54:57 -07:00
proc_devtree.c
proc_net.c
proc_sysctl.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl	2012-03-23 18:08:58 -07:00
proc_tty.c
root.c	proc: fix mount -t proc -o AAA	2012-04-05 15:25:50 -07:00
softirqs.c
stat.c	nohz: Fix idle ticks in cpu summary line of /proc/stat	2013-03-04 12:48:24 -08:00
task_mmu.c	proc/pid/pagemap: correctly report non-present ptes and holes between vmas	2012-05-10 15:06:44 -07:00
task_nommu.c	procfs: mark thread stack correctly in proc/<pid>/maps	2012-03-21 17:54:58 -07:00
uptime.c
version.c
vmcore.c