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<p class="MsoNormal">Thanks for trying it out! <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To get context-sensitive profile, you will need to collect perf data with both LBR and stack sample enabled. We use something like this:
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">perf record -g --call-graph fp -e br_inst_retired.near_taken:uppp -c 16009 -b -o <perf_data_output> <command_to_profile><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here’s the perf script command to extract both LBR and stack sample:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">perf script -F ip,brstack -i <perf_data_output> --show-mmap-event &> <perf_script_output><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Let us know how it works. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Wenlei<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of Lanzhiguan Huang via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Date: </b>Thursday, March 4, 2021 at 11:32 PM<br>
<b>To: </b>LLVM Developers Mailing List <llvm-dev@lists.llvm.org><br>
<b>Subject: </b>[llvm-dev] How to generate the perfscript file for llvm-profgen<o:p></o:p></span></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"> I'm really interested in the new CSSPGO tool, can anyone give me some more detailed instructions about how to generate the perfscript file it needs, I tried to first use "perf record -e xxx -b ..." to generate a perf.data file and then
use "perf script" to dump all the text into a perfscript file, but it seems to be different from the perfscript under the llvm/test/tools/llvm-profgen/Inputs directory.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Lanzhiguan<o:p></o:p></p>
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