Re: [PATCH] sysctl: Allow /proc/sys without sys_sysctl

[Eric W. Biederman]

Andi Kleen <ak@xxxxxxx> writes:

>> So it will correctly handle that sysctl being compiled out, and
>> the fallback to using /proc.  The code seems to have been
>> doing that since it was added to glibc in 2000.
>
> Using /proc is extremly slow for this.

How so it is the same code in the kernel.  Is open much slower than
sys_sysctl?

> You added significant cost to each program startup.

Not each program only the ones that use pthreads.

> I still think it's a good idea to simulate that sysctl and printk
> the others.

To reduce the noise something like that makes sense.  I'm going to
see if I can get glibc to use uname which should have the same effect.

Eric
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