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SubjectRe: Measured overhead of timer interrupts
In <19990723032046.B3992@fred.muc.de> Andi Kleen (ak@muc.de) wrote:
AK> On Fri, Jul 23, 1999 at 02:58:35AM +0200, Khimenko Victor wrote:
>> In <19990723003639.B3385@fred.muc.de> Andi Kleen (ak@muc.de) wrote:
>> AK> On Thu, Jul 22, 1999 at 09:12:22PM +0200, Khimenko Victor wrote:
>> >> In <19990722171109.A1783@fred.muc.de> Andi Kleen (ak@muc.de) wrote:
>> >> > On Thu, Jul 22, 1999 at 05:02:14PM +0200, Ingo Molnar wrote:
>> >> >>
>> >> >> On 22 Jul 1999, Andi Kleen wrote:
>> >> >>
>> >> >> > It is a kernel bug, HZ is not exported. Actually two, because none of
>> >> >> > the /proc should have used it as units, but that cannot be fixed anymore.
>> >> >>
>> >> >> why cannot it be fixed?
>> >>
>> >> > because that would break the interface.
>> >>
>> >> /proc interface are in permanent change. We should keep it consistent in one
>> >> stable kernel series but I see no reason to keep it consistent between major
>> >> kernel updates: quite a lot of things will be changed anyway.
>>
>> AK> This is not really true. There are new columns or lines added to /proc
>> AK> files, but old ones are not changes, and correctly writen /proc parsers
>> AK> should not break (unfortunately there are lots of incorrectly writen
>> AK> proc parser around..)
>>
>> I yet to see "correct parser" with ability to find out file-max, file-nr,
>> inode-max and inode0-nr moved from /proc/sys/kernel in 2.0 to
>> /proc/sys/fs in 2.2...

AK> /proc and /proc/sys are different things. I meant /proc files.

Not sure why /proc and /proc/sys are SO different...

>>
>> Concerning HZ: what are those sysctls ? How many programs use them ?

AK> See Documentation/proc.txt

AK> Mainly users do, but they still cannot broken, because they are already
AK> deeply embedded in many startup scripts.

Startup SCRIPTS can be easily fixed/rewritten. No problem to me at all.
It was needed for 2.0 => 2.2 transition, I see no reason to have 2.2 => 2.4
different...





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