Regarding the basic use of perf top command

[ankur dwivedi]

Hi,

My question is regarding the basic use of perf top command in linux.

The following is the snap shot of running a "*perf top -e cache-misses*"
command from console:

----------------------------------------------------------------------------------------------------------------------------------------------------------------------
   PerfTop:      76* irqs/sec*  kernel:14.5%  exact:  0.0% [1000Hz
cache-misses],  (all, 12 CPUs)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------

             *samples*  *pcnt* function                DSO
             _______ _____ _______________________
____________________________________

               48.00 36.9% get_page_from_freelist
[kernel.kallsyms]
               12.00  9.2% JS_CallTracer
/usr/lib/xulrunner-1.9.2/libmozjs.so
               12.00  9.2% JS_TraceChildren
/usr/lib/xulrunner-1.9.2/libmozjs.so
                8.00  6.2% dso__find_symbol
/usr/bin/perf
                7.00  5.4% native_flush_tlb_single
[kernel.kallsyms]
                6.00  4.6% _int_malloc
/lib/libc-2.12.90.so



What i want to know is the significance of different parameters here which
are the following:
1. irqs/sec
2. samples
3. pcnt

It also shows a value of 1000Hz. what is the meaning of that.

I searched regarding these in the internet, but was unable to find a good
explanation

Thanks
Ankur
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