Thanks.
I use this command git checkout --track remotes/origin/tilt-3.4

Perf does give me the value of performance counter.But when execute the command
perf stat -v echo "linaro" , context-switches is 0.
Following is the full result.
root@(none):/# ./perf stat -v echo "linaro"
linaro
task-clock: 1464844 1464844 1464844
context-switches: 0 1464844 1464844
CPU-migrations: 0 1464844 1464844
page-faults: 121 1464844 1464844
cycles: 1738255 1464844 1464844
stalled-cycles-frontend: 349665 1464844 1464844
stalled-cycles-backend: 1308413 1464844 1464844
instructions: 637447 1464844 1464844
branches: 62121 1464844 1464844
branch-misses: 31739 1464844 1464844

Performance counter stats for 'echo linaro':

          1.464844 task-clock                #    0.787 CPUs utilized
                 0 context-switches          #    0.000 M/sec
                 0 CPU-migrations            #    0.000 M/sec
               121 page-faults               #    0.083 M/sec
           1738255 cycles                    #    1.187 GHz
            349665 stalled-cycles-frontend   #   20.12% frontend cycles idle
           1308413 stalled-cycles-backend    #   75.27% backend cycles idle
            637447 instructions              #    0.37 insns per cycle
                                             #    2.05 stalled cycles per insn
             62121 branches                  #   42.408 M/sec
             31739 branch-misses             #   51.09% of all branches

       0.001861593 seconds time elapsed

Is there any kernel version supports both complete performance counters and android?Because I want to
use perf when running android program.Thanks.

2012/12/5 David Long <dave.long@linaro.org>

On 12/05/12 00:32, Peng Fan wrote:

Thanks for your reply ,David Long.
Can you give me url of the kernel version 3.4.19?Thanks.

I suggest checking out the "tilt-3.4" branch of git://git.linaro.org/landing-teams/working/ti/kernel.git

That is based on 3.4.20.

git clone git://git.linaro.org/landing-teams/working/ti/kernel.git
cd kernel
git checkout --track tilt-3.4

Looks like omap4plus_defconfig already has what you need for hardware perf counters.

--
David Long
Kernel Engineer, TI Landing Team
Linaro