Re: No samples created when running oprofile on armv7

[bdg <bis...@gm...>]

Hi,

I am adding the PMNC register dump in case it helps.

After starting the profiler:
------------------------
PMNC  =0x41002008
CNTENS=0x80000000
INTENS=0x80000000
FLAGS =0x00000000
SELECT=0x00000000
CCNT  =0xfffdb610
CNT[0] count =0x00000000
CNT[0] evtsel=0x00000000
CNT[1] count =0x00000000
CNT[1] evtsel=0x00000000
CNT[2] count =0x00000000
CNT[2] evtsel=0x00000000
CNT[3] count =0x00000000
CNT[3] evtsel=0x00000000
----------------

After stopping the profiler
-------------------------
PMNC  =0x41002009
CNTENS=0x80000000
INTENS=0x80000000
FLAGS =0x80000000
SELECT=0x00000003
CCNT  =0x8df3a2f9
CNT[0] count =0x00000000
CNT[0] evtsel=0x00000000
CNT[1] count =0x00000000
CNT[1] evtsel=0x00000000
CNT[2] count =0x00000000
CNT[2] evtsel=0x00000000
CNT[3] count =0x00000000
CNT[3] evtsel=0x00000000




bdg wrote:
> 
> Hi All,
> 
> We are new to linux and to oprofile and need some help. 
> 
> We use the oprofile code v0.9.5 on linux kernel v2.6.29
> 
> We tried cross-compiling the latest oprofile code for arm-linux on linux
> kernel v2.6.29 and was able to start the profiler. However we could not
> see any sample getting logged. The value stored in file
> /var/lib/oprofile/samples/current/stats/cpu0/sample_received is 0 which is
> same as in files backtrace_aborted, sample_lost_overflow and
> sample_invalid_eip.
> 
> The profiler was started with following commands:
> =======================================
> opcontrol --vmlinux=/root/vmlinux --event=CPU_CYCLES:150000
> opcontrol --start
> opcontrol --status   #this showed that the profiler daemon is running
> Then after sometime we did
> opcontrol --dump
> opcontrol --stop
> opcontrol --shutdown
> =========================================
> When we run the opreport tool, it says "error: no sample files found:
> profile specification too strict? "
> Interchanging the sop and dump calls do not creat any difference.
> 
> The oprofiled.log is as follows:
> =====================================================
> oprofiled started Thu Jan  1 01:01:00 1970
> kernel pointer size: 4
> 
> Thu Jan  1 01:02:38 1970
> 
> -- OProfile Statistics --
> Nr. sample dumps: 4
> Nr. non-backtrace samples: 0
> Nr. kernel samples: 0
> Nr. lost samples (no kernel/user): 0
> Nr. lost kernel samples: 0
> Nr. incomplete code structs: 0
> Nr. samples lost due to sample file open failure: 0
> Nr. samples lost due to no permanent mapping: 0
> Nr. event lost due to buffer overflow: 0
> Nr. samples lost due to no mapping: 0
> Nr. backtraces skipped due to no file mapping: 0
> Nr. samples lost due to no mm: 0
> 
> ---- Statistics for cpu : 0
> Nr. samples lost cpu buffer overflow: 0
> Nr. samples received: 0
> Nr. backtrace aborted: 0
> Nr. samples lost invalid pc: 0
> oprofiled stopped Thu Jan  1 01:02:38 1970
> =====================================
> 
> The /.oprofile/deamonrc file is as follows:
> ====================================
> SESSION_DIR=/var/lib/oprofile
> CHOSEN_EVENTS_0=CPU_CYCLES:150000:0:1:1
> NR_CHOSEN=1
> SEPARATE_LIB=0
> SEPARATE_KERNEL=0
> SEPARATE_THREAD=0
> SEPARATE_CPU=0
> VMLINUX=/root/vmlinux
> IMAGE_FILTER=
> CPU_BUF_SIZE=0
> CALLGRAPH=0
> KERNEL_RANGE=c0037000,c0407000
> XENIMAGE=none
> ========================================
> 
> Following an earlier mail in this forum we did a grep on
> "tracing-core-for-linus" in our kernel source tree to check for any patch
> but found nothing.
> 
> On debugging the profiler driver we found that the variable "available" in
> function sync_buffer() in file   drivers/oprofile/buffer_sync.c is always
> getting a value 0 and hence no sample is getting added.
> 
> ======
> Can someone please help us on this? 
> 
> Thanks in advance.
> 
> 
> 

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