[linux-2.6-block.git] / Documentation / trace / events-msr.txt


The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
To see the definition of the MSRs on Intel systems please see the SDM
at http://www.intel.com/sdm (Volume 3)

Available trace points:

/sys/kernel/debug/tracing/events/msr/

Trace MSR reads

read_msr

msr: MSR number
val: Value written
failed: 1 if the access failed, otherwise 0


Trace MSR writes

write_msr

msr: MSR number
val: Value written
failed: 1 if the access failed, otherwise 0


Trace RDPMC in kernel

rdpmc

The trace data can be post processed with the postprocess/decode_msr.py script

cat /sys/kernel/debug/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h

to add symbolic MSR names.
Commit	Line	Data
7f47d8cc AK	1
	2	The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
	3	To see the definition of the MSRs on Intel systems please see the SDM
	4	at http://www.intel.com/sdm (Volume 3)
	5
	6	Available trace points:
	7
	8	/sys/kernel/debug/tracing/events/msr/
	9
	10	Trace MSR reads
	11
	12	read_msr
	13
	14	msr: MSR number
	15	val: Value written
	16	failed: 1 if the access failed, otherwise 0
	17
	18
	19	Trace MSR writes
	20
	21	write_msr
	22
	23	msr: MSR number
	24	val: Value written
	25	failed: 1 if the access failed, otherwise 0
	26
	27
	28	Trace RDPMC in kernel
	29
	30	rdpmc
	31
	32	The trace data can be post processed with the postprocess/decode_msr.py script
	33
	34	cat /sys/kernel/debug/tracing/trace \| decode_msr.py /usr/src/linux/include/asm/msr-index.h
	35
	36	to add symbolic MSR names.
	37