Re: getting processor numbers

[Eric Dumazet]

H. Peter Anvin a Ãcrit :
> Jeremy Fitzhardinge wrote:
> > H. Peter Anvin wrote:
> > > Mutable data should be separated from code.  I think any current CPU
> > > will do fine as long as they are in separate 128-byte chunks, but they
> > > need at least that much separation.
> > P4 manual says that if one processor modifies data within 2k of another
> > processor executing code, it will trash the entire trace cache.
>
> Yuck.  Didn't realize the P4 was that sensitive.  OK, so at the least we 
> need a half-page of separation.

Yes but vsyscall API currently defines 4 entry points :

vsyscall0 (vgettimeofday) = ADDR
vsyscall1 (vtime)    = ADDR+1024
vsyscall2 (vgetcpu) = ADDR+2048
vsyscall3 (vxxxxx)  = ADDR+3072

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