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SubjectRe: [patch-2.4.0-test7-pre7] do_fork() optimization.
On Wed, 23 Aug 2000, Linus Torvalds wrote:
> On Wed, 23 Aug 2000, Tigran Aivazian wrote:
> >
> > I was thinking if I could get a few more cycles out of do_fork() (the
> > recent SCO propaganda about their _lwp_create(2) being faster than our
> > clone(2) made me think). And I noticed that get_pid() doesn't actually
> > need the lastpid_lock because it is only ever called from do_fork() inside
> > the lock_kernel(). So, here is the obvious patch.
> Hmm.. I'd rather get rid of the _other_ spinlock, namely the kernel lock.
> I don't actually see anything that requires or even _wants_ the kernel
> lock anywhere. Can anybody tell me what I'm missing?

I will test without BKL on my SMP and let you know. The code seems fine
but I may be blind...


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