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Message-ID: <4D368EB8.5020605@jp.fujitsu.com> Date: Wed, 19 Jan 2011 16:11:52 +0900 From: Satoru Takeuchi <takeuchi_satoru@...fujitsu.com> To: Ciju Rajan K <ciju@...ux.vnet.ibm.com> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>, lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Bharata B Rao <bharata@...ux.vnet.ibm.com>, Srivatsa Vaddagiri <vatsa@...ibm.com> Subject: Re: [PATCH 2/2 v1.0]sched: Updating the sched-stat documentation Hi Ciju, (2011/01/18 15:04), Ciju Rajan K wrote: > sched: Updating the sched-stat documentation > > Some of the unused fields are removed from /proc/schedstat. > This is the documentation changes reflecting the same. > > Signed-off-by: Ciju Rajan K<ciju@...ux.vnet.ibm.com> > --- > > diff -Naurp a/Documentation/scheduler/sched-stats.txt b/Documentation/scheduler/sched-stats.txt > --- a/Documentation/scheduler/sched-stats.txt 2011-01-17 01:07:47.000000000 +0530 > +++ b/Documentation/scheduler/sched-stats.txt 2011-01-17 15:32:05.000000000 +0530 > @@ -26,119 +26,81 @@ Note that any such script will necessari > reason to change versions is changes in the output format. For those wishing > to write their own scripts, the fields are described here. > > +The first two fields of /proc/schedstat indicates the version (current > +version is 16) and jiffies values. The following values are from > +cpu& domain statistics. cpu & domain statistics. > + > CPU statistics > -------------- > -cpu<N> 1 2 3 4 5 6 7 8 9 10 11 12 > +The format is like this: > + > +cpu<N> 1 2 3 4 5 6 7 8 > > -NOTE: In the sched_yield() statistics, the active queue is considered empty > - if it has only one process in it, since obviously the process calling > - sched_yield() is that process. > - > -First four fields are sched_yield() statistics: > - 1) # of times both the active and the expired queue were empty > - 2) # of times just the active queue was empty > - 3) # of times just the expired queue was empty > - 4) # of times sched_yield() was called > - > -Next three are schedule() statistics: > - 5) # of times we switched to the expired queue and reused it > - 6) # of times schedule() was called > - 7) # of times schedule() left the processor idle > - > -Next two are try_to_wake_up() statistics: > - 8) # of times try_to_wake_up() was called > - 9) # of times try_to_wake_up() was called to wake up the local cpu > - > -Next three are statistics describing scheduling latency: > - 10) sum of all time spent running by tasks on this processor (in jiffies) > - 11) sum of all time spent waiting to run by tasks on this processor (in > - jiffies) > - 12) # of timeslices run on this cpu > +NOTE: In the sched_yield() statistics, the active queue is considered > + empty if it has only one process in it, since obviously the > + process calling sched_yield() is that process. There are no active/expired queue any more. > + > + 1) # of times sched_yield() was called on this CPU > + 2) # of times scheduler runs on this CPU > + 3) # of times scheduler picks idle task as next task on this CPU > + 4) # of times try_to_wake_up() is run on this CPU > + (Number of times task wakeup is attempted from this CPU) > + 5) # of times try_to_wake_up() wakes up a task on the same CPU > + (local wakeup) > + 6) Time(ns) for which tasks have run on this CPU > + 7) Time(ns) for which tasks on this CPU's runqueue have waited > + before getting to run on the CPU > + 8) # of tasks that have run on this CPU > > > Domain statistics > ----------------- > -One of these is produced per domain for each cpu described. (Note that if > -CONFIG_SMP is not defined, *no* domains are utilized and these lines > -will not appear in the output.) > +One of these is produced per domain for each cpu described. > +(Note that if CONFIG_SMP is not defined, *no* domains are utilized > + and these lines will not appear in the output.) > > -domain<N> <cpumask> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 > +domain<N> <cpumask> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 > > The first field is a bit mask indicating what cpus this domain operates over. > > -The next 24 are a variety of load_balance() statistics in grouped into types > -of idleness (idle, busy, and newly idle): > +The next 24 are a variety of load_balance() statistics grouped into > +types of idleness (idle, busy, and newly idle). The three idle > +states are: > + > +CPU_NEWLY_IDLE: Load balancer is being run on a CPU which is > + about to enter IDLE state > +CPU_IDLE: This state is entered after CPU_NEWLY_IDLE > + state fails to find a new task for this CPU > +CPU_NOT_IDLE: Load balancer is being run on a CPU when it is > + not in IDLE state (busy times) > + > +There are eight stats available for each of the three idle states: It's more helpful iffiled 1-8 are for CPU_NEWLY_IDLE, 9-15 are for CPU_IDLE, and 16-24 is for CPU_NOT_IDLE. Current description doesn't say whether 1) lb_count[CPU_NEWLY_IDLE], 2) lb_balanced[CPU_NEWLY_IDLE], 3) lb_failed[CPU_NEWLY_IDLE], ... or 1) lb_count[CPU_NEWLY_IDLE] 2) lb_count[CPU_IDLE] 3) lb_count[CPU_NOT_IDLE] ... Thanks, Satoru > > - 1) # of times in this domain load_balance() was called when the > - cpu was idle > + 1) # of times in this domain load_balance() was called > 2) # of times in this domain load_balance() checked but found > - the load did not require balancing when the cpu was idle > + the load did not require balancing > 3) # of times in this domain load_balance() tried to move one or > - more tasks and failed, when the cpu was idle > + more tasks and failed > 4) sum of imbalances discovered (if any) with each call to > - load_balance() in this domain when the cpu was idle > - 5) # of times in this domain pull_task() was called when the cpu > - was idle > + load_balance() in this domain > + 5) # of times in this domain pull_task() was called > 6) # of times in this domain pull_task() was called even though > - the target task was cache-hot when idle > + the target task was cache-hot > 7) # of times in this domain load_balance() was called but did > - not find a busier queue while the cpu was idle > - 8) # of times in this domain a busier queue was found while the > - cpu was idle but no busier group was found > - > - 9) # of times in this domain load_balance() was called when the > - cpu was busy > - 10) # of times in this domain load_balance() checked but found the > - load did not require balancing when busy > - 11) # of times in this domain load_balance() tried to move one or > - more tasks and failed, when the cpu was busy > - 12) sum of imbalances discovered (if any) with each call to > - load_balance() in this domain when the cpu was busy > - 13) # of times in this domain pull_task() was called when busy > - 14) # of times in this domain pull_task() was called even though the > - target task was cache-hot when busy > - 15) # of times in this domain load_balance() was called but did not > - find a busier queue while the cpu was busy > - 16) # of times in this domain a busier queue was found while the cpu > - was busy but no busier group was found > - > - 17) # of times in this domain load_balance() was called when the > - cpu was just becoming idle > - 18) # of times in this domain load_balance() checked but found the > - load did not require balancing when the cpu was just becoming idle > - 19) # of times in this domain load_balance() tried to move one or more > - tasks and failed, when the cpu was just becoming idle > - 20) sum of imbalances discovered (if any) with each call to > - load_balance() in this domain when the cpu was just becoming idle > - 21) # of times in this domain pull_task() was called when newly idle > - 22) # of times in this domain pull_task() was called even though the > - target task was cache-hot when just becoming idle > - 23) # of times in this domain load_balance() was called but did not > - find a busier queue while the cpu was just becoming idle > - 24) # of times in this domain a busier queue was found while the cpu > - was just becoming idle but no busier group was found > - > + not find a busier queue > + 8) # of times in this domain a busier queue was found but no > + busier group was found > + > Next three are active_load_balance() statistics: > 25) # of times active_load_balance() was called > 26) # of times active_load_balance() tried to move a task and failed > 27) # of times active_load_balance() successfully moved a task > > - Next three are sched_balance_exec() statistics: > - 28) sbe_cnt is not used > - 29) sbe_balanced is not used > - 30) sbe_pushed is not used > - > - Next three are sched_balance_fork() statistics: > - 31) sbf_cnt is not used > - 32) sbf_balanced is not used > - 33) sbf_pushed is not used > - > - Next three are try_to_wake_up() statistics: > - 34) # of times in this domain try_to_wake_up() awoke a task that > + Next two are try_to_wake_up() statistics: > + 28) # of times in this domain try_to_wake_up() awoke a task that > last ran on a different cpu in this domain > - 35) # of times in this domain try_to_wake_up() moved a task to the > + 29) # of times in this domain try_to_wake_up() moved a task to the > waking cpu because it was cache-cold on its own cpu anyway > - 36) # of times in this domain try_to_wake_up() started passive balancing > > /proc/<pid>/schedstat > ---------------- > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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