Re: random PIDs

[David Weinehall <tao@acc.umu.se>]

On Wed, Apr 04, 2001 at 04:17:45PM +0200, Heusden, Folkert van wrote:
> Finished & tested my random PID kernel/fork.c:get_pid() replacement.
> This one keeps track of the last N (default is 64) pids who have exited.
> These are then not used. So, one cannot have more then 32767 - (64 + 1
> (init) + 1 (idle)) = 32761 processes :o)

Huh, should be 32701, right?!

> I know that it was all implemented before, but this patch is very small 
> and I couldn't stand the idea the fact that my last announcement was for
> a patch which didn't work at all :o)
> 
> One can find it at: http://www.vanheusden.com/Linux/kernel_patches.php3
> (or: http://www.vanheusden.com/Linux/fp-2.2.19.patch.gz but then you
> miss the list of other patches ;-])
> Patch is against kernel 2.2.19.
> 
> I did not do any performance tests, but the machine I tested it on
> (300MHz dec alpha) felt (felt?) as smooth as before :o)
> 
> 
> Folkert van Heusden
> 
> [ www.vanheusden.com ]
> 
> p.s. the patch mentioned above also raises the number of pool-words
> from 128 to 2048, adds code to do_exit which tells you if the idle
> task is killed (as in 2.4.x), and replaces
> net/core/utils.c:net_[s]random() with something which uses
> get_random_bytes().


/David
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