Messages in this thread | | | From | Vince Weaver <> | Date | Thu, 10 Aug 2017 14:48:52 -0400 (EDT) | Subject | perf: multiple mmap of fd behavior on x86/ARM |
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So I was working on my perf_event_tests on ARM/ARM64 (the end goal was to get ARM64 rdpmc support working, but apparently those patches never made it upstream?)
anyway one test was failing due to an x86/arm difference, which is possibly only tangentially perf related.
On x86 you can mmap() a perf_event_open() file descriptor multiple times and it works.
On ARM/ARM64 you can only mmap() it once, any other attempts fail.
Is this expected behavior?
You can run the tests/record_sample/mmap_multiple test in the current git of my perf_event_tests testsuite for a testcase.
Vince
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