Messages in this thread |  | | Date | Wed, 28 Aug 2002 19:16:31 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [patch] "fully HT-aware scheduler" support, 2.5.31-BK-curr |
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On Wed, 28 Aug 2002, Rusty Russell wrote:
> > - HT-aware affinity. > > > > Tasks should attempt to 'stick' to physical CPUs, not logical CPUs. > > Linus disagreed with this before when I discussed it with him, and with > the current (stupid, non-portable, broken) set_affinity syscall he's > right.
actually, affinity still works just fine, users can bind tasks to logical CPUs as well. What i meant was the affinity logic of the scheduler (ie. affinity decisions done by the scheduler), not the externally visible affinity API.
> You don't know if someone said "schedule me on cpu 0" because they > really want to be scheduled on CPU 0, or because they really *don't* > want to be scheduled on CPU 1 (where something else is running). You > can't just assume they are equivalent if they are the same physical CPU.
i dont assume that. There's also a fair amount of code in the kernel that relies on binding threads to particular CPUs, the patch does not break that in any way.
Ingo
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