From mboxrd@z Thu Jan  1 00:00:00 1970
From: vj358@nyu.edu (Vipin)
Date: Wed, 13 Jul 2011 11:40:03 -0400
Subject: Regarding the basic use of perf top command
In-Reply-To: <CABW4kEdMKooSpG3uEXyS5n-eJu3LfniBXiPVpxzkpAm728czTA@mail.gmail.com>
References: <CABW4kEdMKooSpG3uEXyS5n-eJu3LfniBXiPVpxzkpAm728czTA@mail.gmail.com>
Message-ID: <4E1DBC53.40901@nyu.edu>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi,

I think this should suffice
https://perf.wiki.kernel.org/index.php/Tutorial#Live_analysis_with_perf_top

Rest of the information is archived here
http://lxr.linux.no/linux+v2.6.39/tools/perf/Documentation/

The value of 1000Hz means the frequency at which the system's timer is 
programmed to interrupt the kernel. It is a kernel configurable option.

Thanks
Vipin
On 07/13/2011 10:59 AM, ankur dwivedi wrote:
> 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 <http://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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