From: ankurengg2003@gmail.com (ankur dwivedi)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Regarding the basic use of perf top command
Date: Wed, 13 Jul 2011 20:29:12 +0530 [thread overview]
Message-ID: <CABW4kEdMKooSpG3uEXyS5n-eJu3LfniBXiPVpxzkpAm728czTA@mail.gmail.com> (raw)
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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Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-13 14:59 ankur dwivedi [this message]
2011-07-13 15:40 ` Regarding the basic use of perf top command Vipin
2011-07-14 7:02 ` ankur dwivedi
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