linux-kernel - Re: [RFC][PATCH 5/6] mm: Provide speculative fault infrastructure

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Date:	Tue, 21 Oct 2014 12:41:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de, akpm@...ux-foundation.org, riel@...hat.com,
	mgorman@...e.de, oleg@...hat.com, mingo@...hat.com,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, laijs@...fujitsu.com, dave@...olabs.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 5/6] mm: Provide speculative fault infrastructure

On Tue, Oct 21, 2014 at 11:35:48AM +0300, Kirill A. Shutemov wrote:
> pud_huge() too. Or filter out VM_HUGETLB altogether.

Oh right, giga pages, all this new fangled stuff ;-) But yes, I suppose
we can exclude hugetlbfs, we should arguably make the thp muck work
though.

> BTW, what keeps mm_struct around? It seems we don't take reference during
> page fault.

Last I checked tasks have a ref on their own mm, and seeing this all
runs in task context, the mm should be pretty safe.
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