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author | Thomas Renninger <trenn@suse.de> | 2012-11-27 12:17:48 (GMT) |
---|---|---|
committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2012-11-27 22:07:20 (GMT) |
commit | c8cfc3c6bf404b0f110631d5bba234982e6ad24f (patch) | |
tree | dd6e71768799b81cca6e78fb0a26a45526a5af85 /tools/power/cpupower/utils/helpers/helpers.h | |
parent | ea1021ffa65a81da3d393fcbd7509d6e40d4d325 (diff) | |
download | linux-c8cfc3c6bf404b0f110631d5bba234982e6ad24f.tar.xz |
cpupower: Provide -c param for cpupower monitor to schedule process on all cores
If an MSR based monitor is run in parallel this is not needed. This is the
default case on all/most Intel machines.
But when only sysfs info is read via cpupower monitor -m Idle_Stats (typically
the case for non root users) or when other monitors are PCI based (AMD),
Idle_Stats, read from sysfs can be totally bogus:
cpupower monitor -m Idle_Stats
PKG |CORE|CPU | POLL | C1-N | C3-N | C6-N
0| 0| 0| 0.00| 0.00| 0.24| 99.81
0| 0| 32| 0.00| 0.00| 0.00| 100.7
...
0| 17| 20| 0.00| 0.00| 0.00| 173.1
0| 17| 52| 0.00| 0.00| 0.07| 173.0
0| 18| 68| 0.00| 0.00| 0.00| 0.00
0| 18| 76| 0.00| 0.00| 0.00| 0.00
...
With the -c option all cores are woken up and the kernel
did update cpuidle statistics before reading out sysfs.
This causes some overhead. Therefore avoid if possible, use
if needed:
cpupower monitor -c -m Idle_Stats
PKG |CORE|CPU | POLL | C1-N | C3-N | C6-N
0| 0| 0| 0.00| 0.00| 0.00| 100.2
0| 0| 32| 0.00| 0.00| 0.00| 100.2
...
0| 8| 8| 0.00| 0.00| 0.00| 99.82
0| 8| 40| 0.00| 0.00| 0.00| 99.81
0| 9| 24| 0.00| 0.00| 0.00| 100.3
0| 9| 56| 0.00| 0.00| 0.00| 100.2
0| 16| 4| 0.00| 0.00| 0.00| 99.75
0| 16| 36| 0.00| 0.00| 0.00| 99.38
...
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/power/cpupower/utils/helpers/helpers.h')
-rw-r--r-- | tools/power/cpupower/utils/helpers/helpers.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h index f84985f..aa9e954 100644 --- a/tools/power/cpupower/utils/helpers/helpers.h +++ b/tools/power/cpupower/utils/helpers/helpers.h @@ -114,6 +114,7 @@ struct cpupower_topology { extern int get_cpu_topology(struct cpupower_topology *cpu_top); extern void cpu_topology_release(struct cpupower_topology cpu_top); + /* CPU topology/hierarchy parsing ******************/ /* X86 ONLY ****************************************/ |