Messages in this thread | | | From | Namhyung Kim <> | Date | Tue, 27 Oct 2020 14:08:53 +0900 | Subject | Re: Perf raw sample overflows perf record |
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+ LKML
On Sat, Oct 24, 2020 at 8:44 AM George Prekas <prekageo@amazon.com> wrote: > > The header of a perf sample has a u16 field for the size of the record. > On the other hand, a PERF_SAMPLE_RAW has a u32 field for its size. > > I've written a test perf driver that creates large raw samples and it > doesn't work correctly (as expected). For example, perf record fails with: > > Can't parse sample, err = -14 > 0x4688 [0x8]: failed to process type: 68 [Bad address] > > Is this expected? Is the developer of the perf driver responsible to > make sure that each perf record does not exceed 64KB in size? If that's > the case, I am wondering why the raw sample has a u32 for its size.
For the large records, you may consider an auxtrace interface.
Thanks Namhyung
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