Messages in this thread | | | From | "Robert O'Callahan" <> | Date | Sat, 24 Feb 2024 10:43:38 +1300 | Subject | Re: [PATCH 2/2] perf test: Test FASYNC with watermark wakeups. |
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(I work with Kyle.)
IMHO this is more of a bug fix than a feature. `man perf_event_open` expects this to work already: "watermark: If set, have an overflow notification happen when we cross the wakeup_watermark boundary" and later "Alternatively, the overflow events can be captured via a signal handler, by enabling I/O signaling".
Bug fixes need regression tests. Such tests should fail on any kernel where the bug is present. It seems strange to expect each such test to detect whether the bug "should be fixed" in the kernel it's running on and skip when that's not the case. I haven't seen any other project try to do this. Instead (as in kernel selftests) the tests, the code under test, and any metadata about which tests are expected to pass are all in the repository together and updated together.
It makes sense that tests for the code in tools/perf should not fail on older kernels, given that the code in tools/perf is expected to work on older kernels. But tests for bug fixes in the kernel itself should be expected to fail on older kernels and therefore should live somewhere else, IMHO.
Rob -- Su ot deraeppa sah dna Rehtaf eht htiw saw hcihw, efil lanrete eht uoy ot mialcorp ew dna, ti ot yfitset dna ti nees evah ew; deraeppa efil eht. Efil fo Drow eht gninrecnoc mialcorp ew siht - dehcuot evah sdnah ruo dna ta dekool evah ew hcihw, seye ruo htiw nees evah ew hcihw, draeh evah ew hcihw, gninnigeb eht morf saw hcihw taht.
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