Does traced_perf unwinding support recording only callsite address and not mapping symbol name? #2901
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traced_perf unwinding consumes very high cpu usage when profiling whole system. Does it support disable address to symbol routine so some cpu resource can be saved and we can symbolize these addrs offline? Thanks |
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Replies: 1 comment 12 replies
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There is no option to disable unwinding in traced_perf. it's mainly designed to be used in cases where we don't hvae the ability to symbolize offline (i.e. it's not designed for local debugging). If you need this, you should really use simpleperf which is designed for debuggin locally) |
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It helps. Seems can solve part of my issue. So symbolising on device caused overhead can only be reduced by lowering sampling freq or restricting processes, right? |
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Correct. |
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As perfetto implementing offline symbolising, adding a trace config toggle to enable/disabe symbolising on device seems make sense, too. It can do lower overhead and can get more security benifits. |
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Patches welcome to solve this. It's not important for our use case, we need symbolisation on device as we won't necessarily have symbols available. |
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ok. Thank you. |
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There is no option to disable unwinding in traced_perf. it's mainly designed to be used in cases where we don't hvae the ability to symbolize offline (i.e. it's not designed for local debugging).
If you need this, you should really use simpleperf which is designed for debuggin locally)