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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141021104130.GA12706@worktop.programming.kicks-ass.net>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/