Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()

[Arjan van de Ven]

On Sat, 2006-06-24 at 12:21 -0700, Linus Torvalds wrote:
> 
> On Sat, 24 Jun 2006, Arjan van de Ven wrote:
> > 
> > while this patch will reduce the number of cycles spent in the kernel,
> > it's just pushing the cache miss to userspace (by virtue of doing a
> > cache flush effectively)... is this really the right thing? The total
> > memory bandwidth will actually increase with this patch if you're
> > unlucky (eg if userspace decides to write to this memory eventually)....
> 
> No. It's for copying _from_ user space, ie a "write()" system call.

eh DOH

never mind



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