Messages in this thread | | | Date | Fri, 29 Nov 2013 21:35:50 +0100 | From | Oleg Nesterov <> | Subject | Re: [PATCH] Add a text_poke syscall v2 |
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On 11/29, H. Peter Anvin wrote: > > On 11/29/2013 12:05 PM, Oleg Nesterov wrote: > > > > Can't we invalidate pte (so that any user will stuck in page fault), > > update the page(s), restore the pte and drop the locks? > > > > That would require a global TLB shootdown
Well, it is not really global, it is for mm_cpumask() and for good reason?
And is it really worse than on_each_cpu(do_sync_core) and the usage of text_mutex?
> (and wouldn't help > shared-memory code segments, if we care about that at all.)
Well, I think this should only support the private mappings.
> It also > means much bigger code ranges would be affected.
Yes, this is true.
Oleg.
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