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getcpu.2: getcpu() may have an implementation in the vDSO 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-11-09 12:08:00 +01:00
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man2/getcpu.2
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@ -75,6 +75,8 @@ was added in kernel 2.6.19 for x86-64 and i386.
is Linux-specific.
.SH NOTES
Linux makes a best effort to make this call as fast as possible.
(On some architectures, this is done via an implementation in the
.BR vdso (7).)
The intention of
.BR getcpu ()
is to allow programs to make optimizations with per-CPU data