On Wed, Jan 25, 2006 at 09:43:45PM -0800, Stephane Eranian wrote:
> > > /proc/perfmon
>
> This one contains statistics about perfmon such as PMU model, number of active
> sessions, and also a bunch of per-cpu statistics (see attached file).
>
> $ cat /proc/perfmon
> perfmon version : 2.2
> PMU model : Intel Pentium M
> PMU description version : 1.0
> counter width : 31
> loaded per-thread sessions : 0
> loaded sys-wide sessions : 0
> current smpl buffer memory : 0
These can all be individual files, one value per file in sysfs.
> format : d1-39-b2-9e-62-e8-40-e4-b4-02-73-07-87-92-e9-37 default_format2
What does this mean?
> CPU0 total ovfl intrs : 0
> CPU0 spurious intrs : 0
> CPU0 replay intrs : 0
> CPU0 regular intrs : 0
> CPU0 overflow cycles : 0
> CPU0 overflow phase1 : 0
> CPU0 overflow phase2 : 0
> CPU0 overflow phase3 : 0
> CPU0 smpl handler calls : 0
> CPU0 smpl handler cycles : 0
> CPU0 set switch count : 0
> CPU0 set switch cycles : 0
> CPU0 handle timeout : 0
> CPU0 owner task : -1
> CPU0 owner context : 00000000
> CPU0 activations : 0
These should all be individual files, under the specific cpu in
questions in sysfs (/sys/devices/system/cpu/cpuX)
> > > /proc/perfmon_map
>
> This one contains PMU register mapping information. On My laptop, it shows:
> % cat /proc/perfmon_map
> PMC0:0x100000:0xffcfffff:PERFSEL0
> PMC1:0x100000:0xffcfffff:PERFSEL1
> PMD0:0x0:0xffffffffffffffff:PERFCTR0
> PMD1:0x0:0xffffffffffffffff:PERFCTR1
Hm, can you split this up into individual files like:
/sys/kernel/perfmon/map_PMC0
/sys/kernel/perfmon/map_PMC1
/sys/kernel/perfmon/map_PMD0
/sys/kernel/perfmon/map_PMD1
that contain a single line?
"0x100000:0xffcfffff:PERFSEL0" for example for the map_PMC0 file.
> > What are the contents of these files?
> >
> > > These are currently sysctl():
> > >
> > > /proc/sys/kernel/perfmon/arg_size_max
> > > /proc/sys/kernel/perfmon/debug
> > > /proc/sys/kernel/perfmon/debug_ovfl
> > > /proc/sys/kernel/perfmon/expert_mode
> > > /proc/sys/kernel/perfmon/reset_stats
> > > /proc/sys/kernel/perfmon/smpl_buf_size_max
> > > /proc/sys/kernel/perfmon/sys_group
> > > /proc/sys/kernel/perfmon/task_group
> > >
> >
> > What are the contents of these different files?
>
> One integer value per file.
Great, that maps to sysfs just fine.
> > Remember that sysfs is one value per file, so sysctls translate usually
> > very easily to sysfs files.
> >
> Yes, that should be fairly easy.
>
> > You can always just use /sys/kernel/perfmon/ if you like, as I don't
> > think you are bound to anything that would be in the /sys/devices tree
> > (you don't export per-cpu statistics, right?)
> >
> Well, /proc/perfmon does expose per-cpu stats.
Then it should go in the above mentioned sysfs cpu directory.
thanks,
greg k-h
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