Linux-kernel mailing list archive 1999-20,: Re: andrea buffer code (2.2.9-C.gz)

# Re: andrea buffer code (2.2.9-C.gz)

Andrea Arcangeli (andrea@suse.de)
Fri, 21 May 1999 00:44:40 +0200 (CEST)

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On Thu, 20 May 1999, Matthew Kirkwood wrote:

>Indeed. In cases like these, might it make some sense to have some fixed
>number of spinlocks and choose which to use with some reductive function?

Impacting runtime performances to SMP scale better, is going to lose
according to me. I think that if you want to SMP scale better it worth to
pay _only_ with memory wastage and _not_ with wasted CPU cycles.

But as just said masp0008 raised the issue of the io_request_lock that is
just held all the time so we can't scale better at all even using one
spinlock per bit of memory in the machine :-). This is the only thing that
obviously convinced me to remove the spinlock immediatly.

My latest code is placed here. masp0008 feel free to give it a review.

ftp://e-mind.com/pub/andrea/kernel-patches/buffer-2.2.9-L.gz

Thanks.

Andrea Arcangeli

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