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* Make scheduler debug file operations constArjan van de Ven2007-10-15
| | | | | | | | | | In general, struct file_operations are const in the kernel, to not have false cacheline sharing and to catch bugs at compiletime with accidental writes to them. The new scheduler code introduces a new non-const one; fix this up. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: debug, improve migration statisticsIngo Molnar2007-10-15
| | | | | | | add new migration statistics when SCHED_DEBUG and SCHEDSTATS is enabled. Available in /proc/<PID>/sched. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: debug: increase width of debug lineIngo Molnar2007-10-15
| | | | | | increase width of debug line - in preparation of more debugging info. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: group scheduling, sysfs tunablesDhaval Giani2007-10-15
| | | | | | | | | | | | | | | | | | | | | | | | | Add tunables in sysfs to modify a user's cpu share. A directory is created in sysfs for each new user in the system. /sys/kernel/uids/<uid>/cpu_share Reading this file returns the cpu shares granted for the user. Writing into this file modifies the cpu share for the user. Only an administrator is allowed to modify a user's cpu share. Ex: # cd /sys/kernel/uids/ # cat 512/cpu_share 1024 # echo 2048 > 512/cpu_share # cat 512/cpu_share 2048 # Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cleanup: rename task_grp to task_groupIngo Molnar2007-10-15
| | | | | | | cleanup: rename task_grp to task_group. No need to save two characters and 'grp' is annoying to read. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: group scheduler, fix coding style issuesSrivatsa Vaddagiri2007-10-15
| | | | | | | | | Fix coding style issues reported by Randy Dunlap and others Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: speed up and simplify vslice calculationsPeter Zijlstra2007-10-15
| | | | | | | | | speed up and simplify vslice calculations. [ From: Mike Galbraith <efault@gmx.de>: build fix ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up schedstats, cnt -> countIngo Molnar2007-10-15
| | | | | | | | | | | | | | | | rename all 'cnt' fields and variables to the less yucky 'count' name. yuckage noticed by Andrew Morton. no change in code, other than the /proc/sched_debug bkl_count string got a bit larger: text data bss dec hex filename 38236 3506 24 41766 a326 sched.o.before 38240 3506 24 41770 a32a sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched debug: check spreadPeter Zijlstra2007-10-15
| | | | | | | | | | debug feature: check how well we schedule within a reasonable vruntime 'spread' range. (note that CPU overload can increase the spread, so this is not a hard condition, but normal loads should be within the spread.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
* sched debug: more width for parameter printoutsIngo Molnar2007-10-15
| | | | | | | | more width for parameter printouts in /proc/sched_debug. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched debug: print settingsIngo Molnar2007-10-15
| | | | | | | | print the current value of all tunables in /proc/sched_debug output. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched debug: BKL usage statistics, fixS.Caglar Onur2007-10-15
| | | | | | | | build fix for the SCHED_DEBUG && !SCHEDSTATS case. Signed-off-by: S.Ceglar Onur <caglar@pardus.org.tr> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched debug: BKL usage statisticsIngo Molnar2007-10-15
| | | | | | | | add per task and per rq BKL usage statistics. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: add fair-user schedulerSrivatsa Vaddagiri2007-10-15
| | | | | | | | | | | | | | | | | | | Enable user-id based fair group scheduling. This is useful for anyone who wants to test the group scheduler w/o having to enable CONFIG_CGROUPS. A separate scheduling group (i.e struct task_grp) is automatically created for every new user added to the system. Upon uid change for a task, it is made to move to the corresponding scheduling group. A /proc tunable (/proc/root_user_share) is also provided to tune root user's quota of cpu bandwidth. Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: print nr_running and load in /proc/sched_debugSrivatsa Vaddagiri2007-10-15
| | | | | | | | | | - print nr_running and load information for cfs_rq in /proc/sched_debug Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: fix formatting of /proc/sched_debugMike Galbraith2007-10-15
| | | | | | | | fix formatting of /proc/sched_debug Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: enhance debug outputIngo Molnar2007-10-15
| | | | | | | | | enhance debug output by changing 12345678 nsecs to 12.345678 output, this is more human-readable. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: prettify /proc/sched_debug outputIngo Molnar2007-10-15
| | | | | | | | print the correct amount of dashes in /proc/sched_debug. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: do not keep current in the tree and get rid of sched_entity::fair_keyDmitry Adamushko2007-10-15
| | | | | | | | | | | | | | | Get rid of 'sched_entity::fair_key'. As a side effect, 'current' is not kept withing the tree for SCHED_NORMAL/BATCH tasks anymore. This simplifies some parts of code (e.g. entity_tick() and yield_task_fair()) and also somewhat optimizes them (e.g. a single update_curr() now vs. dequeue/enqueue() before in entity_tick()). Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: remove wait_runtime fields and featuresIngo Molnar2007-10-15
| | | | | | | | | | remove wait_runtime based fields and features, now that the CFS math has been changed over to the vruntime metric. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: remove wait_runtime limitIngo Molnar2007-10-15
| | | | | | | | | | remove the wait_runtime-limit fields and the code depending on it, now that the math has been changed over to rely on the vruntime metric. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: clean up struct load_statDmitry Adamushko2007-10-15
| | | | | | | | | | 'struct load_stat' is redundant now so let's get rid of it. Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: add more vruntime statisticsIngo Molnar2007-10-15
| | | | | | | | | add more vruntime statistics. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: add se->vruntime debuggingIngo Molnar2007-10-15
| | | | | | | | debug se->vruntime fields. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de>
* sched: remove precise CPU loadIngo Molnar2007-10-15
| | | | | | | | | | | | CPU load calculations are statistical anyway, and there's little benefit from having it calculated on every scheduling event. So remove this code, it gets rid of a divide from the scheduler wakeup and context-switch fastpath. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: debug: track maximum 'slice'Ingo Molnar2007-10-15
| | | | | | | | | | | track the maximum amount of time a task has executed while the CPU load was at least 2x. (i.e. at least two nice-0 tasks were runnable) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: small sched_debug cleanupIngo Molnar2007-10-15
| | | | | | | | | | | | | | | | small kernel/sched_debug.c cleanup - break up multi-variable assignment. no code changed: text data bss dec hex filename 38869 3550 24 42443 a5cb sched.o.before 38869 3550 24 42443 a5cb sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
* sched: debug: fix sum_exec_runtime clearingIngo Molnar2007-09-05
| | | | | | when cleaning sched-stats also clear prev_sum_exec_runtime. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: sched_clock_idle_[sleep|wakeup]_event()Ingo Molnar2007-08-23
| | | | | | | | | | | | | | | | | | | | construct a more or less wall-clock time out of sched_clock(), by using ACPI-idle's existing knowledge about how much time we spent idling. This allows the rq clock to work around TSC-stops-in-C2, TSC-gets-corrupted-in-C3 type of problems. ( Besides the scheduler's statistics this also benefits blktrace and printk-timestamps as well. ) Furthermore, the precise before-C2/C3-sleep and after-C2/C3-wakeup callbacks allow the scheduler to get out the most of the period where the CPU has a reliable TSC. This results in slightly more precise task statistics. the ACPI bits were acked by Len. Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Len Brown <len.brown@intel.com>
* sched debug: dont print kernel address in /proc/sched_debugIngo Molnar2007-08-10
| | | | | | | | Arjan van de Ven pointed out that we should not print kernel addresses in world-readable /proc files - fix that. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
* sched debug: remove the 'u64 now' parameter from print_task()/_rq()Ingo Molnar2007-08-09
| | | | | | | | remove the 'u64 now' parameter from sched_debug.c:print_task()/_rq(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from print_cfs_rq()Ingo Molnar2007-08-09
| | | | | | | | remove the 'u64 now' parameter from print_cfs_rq(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* take sched_debug.c out of nasal demon territoryAl Viro2007-08-06
| | | | | | | | C99 6.10.3[11]: preprocessing directive within the argument list of macro invocation => undefined behaviour. Don't do that... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] sched: reduce debug codeIngo Molnar2007-08-02
| | | | | | | | | | | move the rest of the debugging/instrumentation code to under CONFIG_SCHEDSTATS too. This reduces code size and speeds code up: text data bss dec hex filename 33044 4122 28 37194 914a sched.o.before 32708 4122 28 36858 8ffa sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Fix leaks on /proc/{*/sched,sched_debug,timer_list,timer_stats}Alexey Dobriyan2007-07-31
| | | | | | | | | | | On every open/close one struct seq_operations leaks. Kudos to /proc/slab_allocators. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] sched: mark sysrq_sched_debug_show() staticJosh Triplett2007-07-26
| | | | | | | | | | | | Only sched.c uses sysrq_sched_debug_show, and sched.c includes sched_debug.c, so all uses of sysrq_sched_debug_show occur in the same source file. Eliminates a sparse warning: warning: symbol 'sysrq_sched_debug_show' was not declared. Should it be static? Signed-off-by: Josh Triplett <josh@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: remove stale version info from kernel/sched_debug.cIngo Molnar2007-07-13
| | | | | | | | kernel/sched_debug.c referred to CFS -v20, but there's no CFS versioning needed within the upstream kernel. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sched: scheduler debugging, coreIngo Molnar2007-07-09
scheduler debugging core: implement /proc/sched_debug and /proc/<PID>/sched files for scheduler debugging. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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