linux-kernel - Re: [PATCH RFC] vm_unmap_aliases: allow callers to inhibit TLB flush

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Message-ID: <495A058C.7060105@goop.org>
Date:	Tue, 30 Dec 2008 22:27:08 +1100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH RFC] vm_unmap_aliases: allow callers to inhibit TLB flush

Nick Piggin wrote:
> I have patches to move the tlb flushing to an asynchronous process context...
> but all tweaks to that (including flushing at vmap) are just variations on the
> existing flushing scheme and don't solve your problem, so I don't think we
> really need to change that for the moment (my patches are mainly for latency
> improvement and to allow vunmap to be usable from interrupt context).
>   

Well, that's basically what I want - I want to use vunmap in an 
interrupts-disabled context.  Any other possibility of deferring tlb 
flushes is pure bonus and not all that important.

But it also occurred to me that Xen doesn't use IPIs for cross-cpu TLB 
flushes (it goes to hypercall), so it shouldn't be an issue anyway.  I 
haven't had a chance to look at what's really going on there.

    J
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