[URGENT] Perf report shared objects showing unknown on ARM

sneha priya sneha.cse at hotmail.com
Thu May 15 05:36:23 UTC 2014


Hello,
There is an issue related to perf which I am facing since 15 days. Hoping that the great minds here will help me to solve this.
I have a requirement to make perf tool work on a device having ARM architecture. But, on recording the tracepoint events and then running ./perf report, it shows the shared objects name as [unknown] and Symbols as 00000, whereas for software and hardware events I do not experience this issue.I have cross compiled the perf tool available on mailine and ported it on a device having ARM architecture.
Output on ARM based device with kernel 3.4.
./perf record -e kmem:kmalloc cal
[ perf record: Woken up 1 times to write data ][ perf record: Captured and wrote 0.007 MB perf.data (~321 samples) ]
./perf report 
Overhead        Command                 Shared Object                     Symbol
...........................   ................................     ...........................................40.78%                       cal                       [unknown]                   [.]0000000031.6%                       cal                       [unknown]                   [.]00000000
[...]
 On ubuntu 12.04, system  (kernel 3.10) it works perfectly fine.
Output on x86 architecture
./perf record -e kmem:kmalloc gcalctool
[ perf record: Woken up 3 times to write data ][ perf record: Captured and wrote 0.27 MB perf.data (~845 samples) ]
./perf report --stdio
Overhead                      Command                             Shared Object                     Symbol
...........................   ................................     ...........................................96.55%                              cal                       [kernel.kallsyms]                   [k] kmem_cache_alloc_trace3.45%                                cal                       [kernel.kallsyms]                  [.]__kmalloc
[...]

Keenly, awaiting for you help.
Thanks.
Sneha. 		 	   		  
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