linux-kernel - Re: [PATCH 0/7] userfault21 update

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Message-ID: <CACh33FoFK4tbKFgcvN3mBuW7V=pMjM=X7eO68Pp9+56pH4B-EQ@mail.gmail.com>
Date:	Mon, 12 Oct 2015 11:04:11 -0400
From:	Patrick Donnelly <batrick@...bytes.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Sanidhya Kashyap <sanidhya.gatech@...il.com>,
	zhang.zhanghailiang@...wei.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Feiner <pfeiner@...gle.com>,
	"Dr. David Alan Gilbert" <dgilbert@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Huangpeng (Peter)" <peter.huangpeng@...wei.com>
Subject: Re: [PATCH 0/7] userfault21 update

Hello Andrea,

On Mon, Jun 15, 2015 at 1:22 PM, Andrea Arcangeli <aarcange@...hat.com> wrote:
> This is an incremental update to the userfaultfd code in -mm.

Sorry I'm late to this party. I'm curious how a ptrace monitor might
use a userfaultfd to handle faults in all of its tracees. Is this
possible without having each (newly forked) tracee "cooperate" by
creating a userfaultfd and passing that to the tracer?

Have you considered using one userfaultfd for an entire tree of
processes (signaled through a flag)? Would not a process id included
in the include/uapi/linux/userfaultfd.h:struct uffd_msg be sufficient
to disambiguate faults?

-- 
Patrick Donnelly
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