[PATCH] Use uname not sysctl to get the kernel revision

[Ulrich Drepper]

Eric W. Biederman wrote:
> But uname is noticeably faster than sysctl and uname is more portable
> across linux flavors.  So updating the glibc pthread code to use
> uname looks like the right way to implement is_smp_system. 

This is (was?) not the universal through.  We used uname at some point
but then I did some profiling and sysctl turned out to be faster.

If the reverse is true now I can certainly look into changing this but
the evidence and ideally has to be there.  The simplicity of the uname
code should mean that it's faster.

In a year or two I'll remove the test anyway.  By then there will likely
not be any UP kernels on reasonable machines anymore and I can drop all
the conditional code.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖

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