Re: SMP question

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Michael Neumann wrote:
> Matthew Dillon wrote:
> >    I would like to revisit SMP but it isn't going to happen until HAMMER
> >    is well into production.  I try to encourage others to take up the SMP
> >    work but so far there's only been some minor poking around.
>
> IMHO a first step would be to write down all the things that needs to be 
> done to get SMP going.

SMP works, it just doesn't work with a high parallelism in the kernel.

It's just a question of removing the implicity dependence on the mplock 
for common code paths.  So the only thing to be done is a) identify common 
code paths  b) in those paths: either aquire the mplock or protect the 
data in a different way  c) in other paths that deal with the same data, 
adjust accordingly.  Easy huh?  :)

My point is that this stuff is all over the place, starting from syscalls, 
going to VFS, VM and drivers.

cheers
  simon

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