Messages in this thread | | | Subject | Re: function ordering (was: Re: [RFC] exit_thread() speedups in x86 process.c) | From | Arjan van de Ven <> | Date | Sun, 03 Jul 2005 14:48:42 +0200 |
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On Sun, 2005-07-03 at 13:30 +0100, Hugh Dickins wrote: > On Sun, 3 Jul 2005, Arjan van de Ven wrote: > > > > hmm. I wonder if a slightly different approach (based on the __slow) > > idea would make sense > > 1) Use -ffunction-sections option from gcc to put each function in it's > > own section > > 2) Use readprofile/oprofile data to collect an (external to the code) > > list of hot/cold functions (we can put a default list in the kernel > > source somewhere and allow people to measure their own if they want) > > 3) Use this list to make a linker script to order the functions > > > > this way we don't need to put a lot of __slow's in the code *and* it's > > based on measurements not assumptions, and can be tuned for a specific > > situation in addition. > > This is reminiscent of "fur", whose source Old SCO opened. > Google for SCO fur: amidst all the hits about "fur flying" > you might find something useful!
it's also similar to the idea to Nat's grope ;) it's just a lot easier for the kernel than for the average userspace since we already have linker scripts
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