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Message-ID: <4D3707A7.9050805@linux.vnet.ibm.com> Date: Wed, 19 Jan 2011 21:17:51 +0530 From: Ciju Rajan K <ciju@...ux.vnet.ibm.com> To: Satoru Takeuchi <takeuchi_satoru@...fujitsu.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>, Ciju Rajan K <ciju@...ux.vnet.ibm.com> Subject: Re: [PATCH 2/2 v1.0]sched: Updating the sched-stat documentation Hi Satoru, >> +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. > Will correct it in the next version. >> + >> +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] > ... > Agreed. There is a certain ambiguity there. I will find a better way to mention it. Thanks for reviewing this. I will send the next version soon. -Ciju > 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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