Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault

[H. Peter Anvin]

On 07/16/2010 11:32 AM, Avi Kivity wrote:
> 
> How long would vmalloc_sync_all take with a few thousand mm_struct take?
> 
> We share the pmds, yes?  So it's a few thousand memory accesses.  The 
> direct impact is probably negligible, compared to actually loading the 
> module from disk.  All we need is to make sure the locking doesn't slow 
> down unrelated stuff.
> 

It's not the memory accesses, it's the need to synchronize all the CPUs.

	-hpa
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