Bharath Ravi d4abc238c9 sched, delay accounting: fix incorrect delay time when constantly waiting on runqueue ... This patch corrects the incorrect value of per process run-queue wait time reported by delay statistics. The anomaly was due to the following reason. When a process leaves the CPU and immediately starts waiting for CPU on the runqueue (which means it remains in the TASK_RUNNABLE state), the time of re-entry into the run-queue is never recorded. Due to this, the waiting time on the runqueue from this point of re-entry upto the next time it hits the CPU is not accounted for. This is solved by recording the time of re-entry of a process leaving the CPU in the sched_info_depart() function IF the process will go back to waiting on the run-queue. This IF condition is verified by checking whether the process is still in the TASK_RUNNABLE state. The patch was tested on 2.6.26-rc6 using two simple CPU hog programs. The values noted prior to the fix did not account for the time spent on the runqueue waiting. After the fix, the correct values were reported back to user space. Signed-off-by: Bharath Ravi <bharathravi1@gmail.com> Signed-off-by: Madhava K R <madhavakr@gmail.com> Cc: dhaval@linux.vnet.ibm.com Cc: vatsa@in.ibm.com Cc: balbir@in.ibm.com Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-06-19 14:15:28 +02:00
..
irq	genirq: reenable a nobody cared disabled irq when a new driver arrives	2008-05-02 13:40:34 +02:00
power	Merge branches 'release', 'acpica', 'bugzilla-10224', 'bugzilla-9772', 'bugzilla-9916', 'ec', 'eeepc', 'idle', 'misc', 'pm-legacy', 'sysfs-links-2.6.26', 'thermal', 'thinkpad' and 'video' into release	2008-04-30 13:58:00 -04:00
time	clocksource: allow read access to available/current_clocksource	2008-05-03 18:11:48 +02:00
.gitignore	Update kernel/.gitignore with new auto-generated files	2008-02-09 23:27:01 -08:00
acct.c	bsd_acct: using task_struct->tgid is not right in pid-namespaces	2008-03-24 19:22:20 -07:00
audit.c	[patch 1/1] audit_send_reply(): fix error-path memory leak	2008-05-17 03:30:22 -04:00
audit.h	[PATCH 1/2] audit: move extern declarations to audit.h	2008-04-28 06:28:04 -04:00
audit_tree.c	[PATCH] list_for_each_rcu must die: audit	2008-05-17 03:30:23 -04:00
auditfilter.c	Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current	2008-04-29 11:41:22 -07:00
auditsc.c	[PATCH] new predicate - AUDIT_FILETYPE	2008-04-28 06:28:37 -04:00
backtracetest.c	x86: add a simple backtrace test module	2008-01-30 13:33:08 +01:00
bounds.c	Add kbuild.h that contains common definitions for kbuild users	2008-04-29 08:06:29 -07:00
capability.c	capabilities: remain source compatible with 32-bit raw legacy capability support.	2008-05-31 16:36:16 -07:00
cgroup.c	cgroups: remove node_ prefix_from ns subsystem	2008-05-24 09:56:14 -07:00
cgroup_debug.c	CGroup API files: move "releasable" to cgroup_debug subsystem	2008-04-29 08:06:09 -07:00
compat.c	ntp: support for TAI	2008-05-01 08:03:59 -07:00
configs.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
cpu.c	kernel: replace remaining __FUNCTION__ occurrences	2008-04-30 08:29:54 -07:00
cpuset.c	sched: CPU hotplug events must not destroy scheduler domains created by the cpusets	2008-06-19 09:14:51 +02:00
delayacct.c	Add scaled time to taskstats based process accounting	2007-10-18 14:37:28 -07:00
dma.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
exec_domain.c	whitespace fixes: execution domains	2007-10-18 14:37:26 -07:00
exit.c	signals: fix sigqueue_free() vs __exit_signal() race	2008-05-24 09:56:10 -07:00
extable.c	module: Don't report discarded init pages as kernel text.	2008-01-29 17:13:18 +11:00
fork.c	[PATCH] dup_fd() fixes, part 1	2008-05-16 17:22:26 -04:00
futex.c	Removal of FUTEX_FD	2008-05-05 08:18:45 -07:00
futex_compat.c	futex_compat __user annotation	2008-03-30 14:18:41 -07:00
hrtimer.c	hrtimer: remove duplicate helper function	2008-05-03 18:11:48 +02:00
itimer.c	ITIMER_REAL: convert to use struct pid	2008-02-08 09:22:29 -08:00
kallsyms.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
Kconfig.hz	sched: high-res preemption tick	2008-01-25 21:08:29 +01:00
Kconfig.preempt	rcu: move PREEMPT_RCU config option back under PREEMPT	2008-03-10 18:01:20 -07:00
kexec.c	kexec: make extended crashkernel= syntax less confusing	2008-05-01 08:04:00 -07:00
kfifo.c	is_power_of_2: kernel/kfifo.c	2007-07-16 09:05:50 -07:00
kgdb.c	kgdb: use common ascii helpers and put_unaligned_be32 helper	2008-05-28 12:49:56 -05:00
kmod.c	[PATCH] split linux/file.h	2008-05-01 13:08:16 -04:00
kprobes.c	kprobes: fix error checking of batch registration	2008-06-12 18:05:40 -07:00
ksysfs.c	Kobject: convert remaining kobject_unregister() to kobject_put()	2008-01-24 20:40:40 -08:00
kthread.c	Deprecate find_task_by_pid()	2008-04-30 08:29:48 -07:00
latencytop.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
lockdep.c	Subject: lockdep: include all lock classes in all_lock_classes	2008-02-25 23:03:02 +01:00
lockdep_internals.h
lockdep_proc.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
Makefile	sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK	2008-05-05 23:56:18 +02:00
marker.c	make marker_debug static	2008-04-30 08:29:49 -07:00
module.c	modules: proper cleanup of kobject without CONFIG_SYSFS	2008-05-23 13:09:33 +10:00
mutex-debug.c	kernel: remove fastcall in kernel/*	2008-02-08 09:22:31 -08:00
mutex-debug.h
mutex.c	kernel: remove fastcall in kernel/*	2008-02-08 09:22:31 -08:00
mutex.h
notifier.c	ipc: re-enable msgmni automatic recomputing msgmni if set to negative	2008-04-29 08:06:13 -07:00
ns_cgroup.c	cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h>	2008-04-29 08:06:07 -07:00
nsproxy.c	ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)	2008-04-29 08:06:14 -07:00
panic.c	Taint kernel after WARN_ON(condition)	2008-04-29 08:05:59 -07:00
params.c	Add new string functions strict_strto* and convert kernel params to use them	2008-02-08 09:22:41 -08:00
pid.c	pids: introduce change_pid() helper	2008-04-30 08:29:48 -07:00
pid_namespace.c	pidns: make pid->level and pid_ns->level unsigned	2008-04-30 08:29:49 -07:00
pm_qos_params.c	pm qos infrastructure and interface	2008-02-05 09:44:22 -08:00
posix-cpu-timers.c	remove div_long_long_rem	2008-05-01 08:03:58 -07:00
posix-timers.c	signals: join send_sigqueue() with send_group_sigqueue()	2008-04-30 08:29:36 -07:00
printk.c	printk: don't read beyond string arguments' terminating zero	2008-04-30 08:29:52 -07:00
profile.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
ptrace.c	make generic sys_ptrace unconditional	2008-05-01 10:21:54 -07:00
rcuclassic.c	Preempt-RCU: implementation	2008-01-25 21:08:24 +01:00
rcupdate.c	rcupdate: fix comment	2008-02-13 16:21:18 -08:00
rcupreempt.c	generic: reduce stack pressure in sched_affinity	2008-04-19 19:44:59 +02:00
rcupreempt_trace.c	Preempt-RCU: implementation	2008-01-25 21:08:24 +01:00
rcutorture.c	kernel: explicitly include required header files under kernel/	2008-04-29 08:06:04 -07:00
relay.c	splice: fix sendfile() issue with relay	2008-05-28 14:49:27 +02:00
res_counter.c	memcgroup: add the max_usage member on the res_counter	2008-04-29 08:06:10 -07:00
resource.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
rtmutex-debug.c	Don't operate with pid_t in rtmutex tester	2008-02-08 09:22:41 -08:00
rtmutex-debug.h
rtmutex-tester.c	Driver core: change sysdev classes to use dynamic kobject names	2008-01-24 20:40:40 -08:00
rtmutex.c	hrtimer: more hrtimer_init_sleeper() fallout.	2008-02-13 15:45:36 +01:00
rtmutex.h
rtmutex_common.h	Don't operate with pid_t in rtmutex tester	2008-02-08 09:22:41 -08:00
rwsem.c	sched: mark rwsem functions as __sched for wchan/profiling	2007-12-18 15:21:13 +01:00
sched.c	sched: CPU hotplug events must not destroy scheduler domains created by the cpusets	2008-06-19 09:14:51 +02:00
sched_clock.c	sched: fix sched_clock_cpu()	2008-05-29 11:29:19 +02:00
sched_debug.c	revert ("sched: fair-group: SMP-nice for group scheduling")	2008-05-29 11:28:57 +02:00
sched_fair.c	sched: stop wake_affine from causing serious imbalance	2008-05-29 11:29:20 +02:00
sched_features.h	sched: /debug/sched_features	2008-04-19 19:45:00 +02:00
sched_idletask.c	sched: make rt_sched_class, idle_sched_class static	2008-05-05 23:56:17 +02:00
sched_rt.c	sched: rt-group: fix RR buglet	2008-06-19 09:06:59 +02:00
sched_stats.h	sched, delay accounting: fix incorrect delay time when constantly waiting on runqueue	2008-06-19 14:15:28 +02:00
seccomp.c	make seccomp zerocost in schedule	2007-07-16 09:05:50 -07:00
semaphore.c	Revert "semaphore: fix"	2008-05-10 20:43:22 -07:00
signal.c	posix timers: discard SI_TIMER signals on exec	2008-05-26 10:37:07 -07:00
softirq.c	Fix cpu hotplug problem in softirq code	2008-05-01 08:03:58 -07:00
softlockup.c	softlockup: fix task state setting	2008-02-29 18:46:53 +01:00
spinlock.c	spinlock: lockbreak cleanup	2008-01-30 13:31:20 +01:00
srcu.c	make srcu_readers_active() static	2008-02-06 10:41:02 -08:00
stacktrace.c
stop_machine.c	stop_machine: make stop_machine_run more virtualization friendly	2008-05-23 13:09:34 +10:00
sys.c	sys_prctl(): fix return of uninitialized value	2008-05-24 09:56:13 -07:00
sys_ni.c	timerfd: new timerfd API	2008-02-05 09:44:07 -08:00
sysctl.c	[PATCH] avoid multiplication overflows and signedness issues for max_fds	2008-05-16 17:22:52 -04:00
sysctl_check.c	constify tables in kernel/sysctl_check.c	2008-02-08 09:22:31 -08:00
taskstats.c	Use find_task_by_vpid in taskstats	2008-04-30 08:29:48 -07:00
test_kprobes.c	kprobes: kretprobe user entry-handler	2008-02-06 10:41:11 -08:00
time.c	Make constants in kernel/timeconst.h fixed 64 bits	2008-05-02 16:18:42 -07:00
timeconst.pl	Make constants in kernel/timeconst.h fixed 64 bits	2008-05-02 16:18:42 -07:00
timer.c	debugobjects: add timer specific object debugging code	2008-04-30 08:29:53 -07:00
tsacct.c	Add scaled time to taskstats based process accounting	2007-10-18 14:37:28 -07:00
uid16.c	asmlinkage_protect replaces prevent_tail_call	2008-04-10 17:28:26 -07:00
user.c	alloc_uid: cleanup	2008-04-30 08:29:53 -07:00
user_namespace.c	eCryptfs: make key module subsystem respect namespaces	2008-04-29 08:06:07 -07:00
utsname.c	kernel: explicitly include required header files under kernel/	2008-04-29 08:06:04 -07:00
utsname_sysctl.c	Isolate the UTS namespace's domainname and hostname back	2007-11-29 09:24:53 -08:00
wait.c	kernel: remove fastcall in kernel/*	2008-02-08 09:22:31 -08:00
workqueue.c	workqueue: remove redundant function invocation	2008-05-01 08:04:02 -07:00