Messages in this thread | | | Date | Wed, 19 Feb 2020 10:47:40 -0500 | From | Tejun Heo <> | Subject | Re: [regression] cpuset: offlined CPUs removed from affinity masks |
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On Wed, Feb 19, 2020 at 10:43:05AM -0500, Mathieu Desnoyers wrote: > The regression I'm talking about here is that CONFIG_CPUSET=y changes the > behavior of the sched_setaffinify system call, which existed prior to > cpusets. > > sched_setaffinity should behave in the same way for kernels configured with > CONFIG_CPUSET=y or CONFIG_CPUSET=n. > > The fact that cpuset decides to irreversibly change the task affinity mask > may not be considered a regression if it has always done that, but changing > the behavior of sched_setaffinity seems to fit the definition of a regression.
We generally use "regression" for breakages which weren't in past versions but then appeared later. It has debugging implications because if we know something is a regression, we generally can point to the commit which introduced the bug either through examining the history or bisection.
It is a silly bug, for sure, but slapping regression name on it just confuses rather than helping anything.
-- tejun
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