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authorJavi Merino <cibervicho@gmail.com>2011-01-31 18:11:36 -0500
committerIngo Molnar <mingo@elte.hu>2011-02-01 03:07:13 -0500
commit1e1dbb259c79b38a542c1c4c00fd8dfe936b183b (patch)
treeae240f978095a095253f93848cce0d3c9733706c /Documentation/scheduler
parentebf53826e105f488f4f628703a108e98940d1dc5 (diff)
sched, docs: Update schedstats documentation to version 15
Version 15 of schedstats was introduced in: 67aa0f767af4: sched: remove unused fields from struct rq and removed three unused counters in sched_yield(). Update the documentation. Signed-off-by: Javi Merino <cibervicho@gmail.com> Cc: henrix@sapo.pt Cc: rdunlap@xenotime.net Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1296515496-8229-1-git-send-email-cibervicho@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/scheduler')
-rw-r--r--Documentation/scheduler/sched-stats.txt33
1 files changed, 15 insertions, 18 deletions
diff --git a/Documentation/scheduler/sched-stats.txt b/Documentation/scheduler/sched-stats.txt
index 01e69404ee5..1cd5d51bc76 100644
--- a/Documentation/scheduler/sched-stats.txt
+++ b/Documentation/scheduler/sched-stats.txt
@@ -1,3 +1,7 @@
1Version 15 of schedstats dropped counters for some sched_yield:
2yld_exp_empty, yld_act_empty and yld_both_empty. Otherwise, it is
3identical to version 14.
4
1Version 14 of schedstats includes support for sched_domains, which hit the 5Version 14 of schedstats includes support for sched_domains, which hit the
2mainline kernel in 2.6.20 although it is identical to the stats from version 6mainline kernel in 2.6.20 although it is identical to the stats from version
312 which was in the kernel from 2.6.13-2.6.19 (version 13 never saw a kernel 712 which was in the kernel from 2.6.13-2.6.19 (version 13 never saw a kernel
@@ -28,32 +32,25 @@ to write their own scripts, the fields are described here.
28 32
29CPU statistics 33CPU statistics
30-------------- 34--------------
31cpu<N> 1 2 3 4 5 6 7 8 9 10 11 12 35cpu<N> 1 2 3 4 5 6 7 8 9
32
33NOTE: In the sched_yield() statistics, the active queue is considered empty
34 if it has only one process in it, since obviously the process calling
35 sched_yield() is that process.
36 36
37First four fields are sched_yield() statistics: 37First field is a sched_yield() statistic:
38 1) # of times both the active and the expired queue were empty 38 1) # of times sched_yield() was called
39 2) # of times just the active queue was empty
40 3) # of times just the expired queue was empty
41 4) # of times sched_yield() was called
42 39
43Next three are schedule() statistics: 40Next three are schedule() statistics:
44 5) # of times we switched to the expired queue and reused it 41 2) # of times we switched to the expired queue and reused it
45 6) # of times schedule() was called 42 3) # of times schedule() was called
46 7) # of times schedule() left the processor idle 43 4) # of times schedule() left the processor idle
47 44
48Next two are try_to_wake_up() statistics: 45Next two are try_to_wake_up() statistics:
49 8) # of times try_to_wake_up() was called 46 5) # of times try_to_wake_up() was called
50 9) # of times try_to_wake_up() was called to wake up the local cpu 47 6) # of times try_to_wake_up() was called to wake up the local cpu
51 48
52Next three are statistics describing scheduling latency: 49Next three are statistics describing scheduling latency:
53 10) sum of all time spent running by tasks on this processor (in jiffies) 50 7) sum of all time spent running by tasks on this processor (in jiffies)
54 11) sum of all time spent waiting to run by tasks on this processor (in 51 8) sum of all time spent waiting to run by tasks on this processor (in
55 jiffies) 52 jiffies)
56 12) # of timeslices run on this cpu 53 9) # of timeslices run on this cpu
57 54
58 55
59Domain statistics 56Domain statistics