Messages in this thread | | | Subject | Re: Microstate Accounting for 2.6.11 | From | Andi Kleen <> | Date | Fri, 11 Mar 2005 08:14:25 +0100 |
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Andrew Morton <akpm@osdl.org> writes:
> Why does the kernel need this feature? > > Have you any numbers on the overhead?
It does RDTSC and lots of complicated stuff twice for each system call. On P4 this will be extremly slow (> 1000cycles combined) It is pretty unlikely that whatever it does justifies this extreme overhead in a critical fast path.
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