Messages in this thread |  | | | Subject | Re: [patch] SMP alternatives | | From | Alan Cox <> | | Date | Wed, 23 Nov 2005 22:05:40 +0000 |
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On Mer, 2005-11-23 at 22:13 +0100, Andi Kleen wrote: > The idea was to turn LOCK on only if the process has any > shared writable mapping and num_online_cpus() > 0.
That makes a lot of sense, and if we hit hardware that does funky stuff then the driver can set a 'vma needs lock' bit for the same effect.
> Might be a bit costly to rewrite all the page tables for that case > just to change the PAT index. A bit is nicer for that.
CPU insert/remove is performed how many times a second ? Or for that matter why not just reload the PAT register and keep the index the same ?
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