Re: [PATCH] Add a text_poke syscall v2
From: Oleg Nesterov
Date: Fri Nov 29 2013 - 15:05:05 EST
On 11/29, Andi Kleen wrote:
>
> > Andi, et al. I am going to discuss the things I do not really
> > understand, probably this can't make any sense, but...
>
> I think it's enough to set the dirty bit in the underlying
> struct page, no need to play games with the PTE.
Ah, sorry for confusion, I guess you misunderstood.
I meant, perhaps sys_text_poke() doesn't the in-kernel text_poke
machinery altogether?
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?
This way sys_text_poke() won't be x86-specific, and it will be per-mm.
Oleg.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/