Re: [patch] jiffies wraparound [Re: 2.1.125 Show stopper list: Draft]

Albert D. Cahalan (acahalan@cs.uml.edu)
Fri, 23 Oct 1998 00:27:48 -0400 (EDT)


Linus Torvalds writes:
> On 21 Oct 1998, Ulrich Drepper wrote:
>
>> But we need many different informations from the kernel. Just a few
>> which pop into my mind: pagesize, max fds/system, max fds/user, total
>> number processors, number processors online.
>
> You can get a lot of that from /proc already.

Yes. Besides being awkward and slow, idiots like to reformat /proc.
Data in /proc is not reliable. Remember the spell checking?
Parsing is impossible because future changes break expected syntax.

> Quite frankly, I don't care about theory. Yes, in theory there's a lot you
> need. In practice, I don't see any real people clamouring for it.

I'm one. I need HZ at least. Page size and the cmd+env size would also
be very useful.

> And discussing this at this point is useless anyway. It's not getting past
> the code-freeze - if people haven't been needing it before now, there's no
> excuse for saying that we need it NOW.

Sure there is: you may want to change some of those constants.

Users want software written for Linux 2.2 to work with Linux 2.4, but
Linux 2.4 may have severe changes. HZ could become 1024 (please!) or the
user-visible page size could become 8192. It will be hard to support
both 2.2 and 2.4 if such information is not readily available.

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