linux-kernel - Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb

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Message-ID: <1337076027.27694.13.camel@twins>
Date:	Tue, 15 May 2012 12:00:27 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Nick Piggin <npiggin@...il.com>
Cc:	Alex Shi <alex.shi@...el.com>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, arnd@...db.de,
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	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
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	linux-arch@...r.kernel.org
Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

On Tue, 2012-05-15 at 19:52 +1000, Nick Piggin wrote:
> 
> It could be warranted to change tlb_flush_mmu to a range API to
> avoid doing the per-entry tracking which those architectures do? 

The per-entry could result in a much smaller range, there's no point in
flushing tlbs for unpopulated pages.

Anyway, I don't think even think we'd need to change the API for that,
you could track the entire range through tlb_start_vma() if you wanted
(although nobody does that IIRC).
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