Re: finding out the value of HZ from userspace

[John Reiser]

Arjan van de Ven wrote:
> On Thu, 2004-03-11 at 15:17, Micha Feigin wrote:
>
> > Is it possible to find out what the kernel's notion of HZ is from user
> > space?
> > It seem to change from system to system and between 2.4 (100 on i386)
> > to 2.6 (1000 on i386).
>
>
> if you can see 1000 from userspace that is a bad kernel bug; can you say
> where you find something in units of 1000 ?

create_elf_tables() in fs/binfmt_elf.c tells every ELF execve():
        NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
which can be found by crawling through the stack above the pointer
to the last environment variable.

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