From: Dave Hansen <dave@sr71.net>
To: Andrea Arcangeli <aarcange@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: "\"Dr. David Alan Gilbert\"" <dgilbert@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Android Kernel Team <kernel-team@android.com>,
Robert Love <rlove@google.com>, Mel Gorman <mel@csn.ul.ie>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
Dmitry Adamushko <dmitry.adamushko@gmail.com>,
Neil Brown <neilb@suse.de>, Mike Hommey <mh@glandium.org>,
Taras Glek <tglek@mozilla.com>, Jan Kara <jack@suse.cz>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Michel Lespinasse <walken@google.com>,
Minchan Kim <minchan@kernel.org>,
Keith Packard <keithp@keithp.com>,
"Huangpeng (Peter)" <peter.huangpeng@huawei.com>,
Isaku Yamahata <yamahata@valinux.co.jp>,
Paolo Bonzini <pbonzini@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
Stefan Hajnoczi <stefanha@gmail.com>,
Wenchao Xia <wenchaoqemu@gmail.com>,
Andrew Jones <drjones@redhat.com>,
Juan Quintela <quintela@redhat.com>, Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH 00/10] RFC: userfault
Date: Thu, 03 Jul 2014 08:41:33 -0700 [thread overview]
Message-ID: <53B579AD.1010201@sr71.net> (raw)
In-Reply-To: <1404319816-30229-1-git-send-email-aarcange@redhat.com>
On 07/02/2014 09:50 AM, Andrea Arcangeli wrote:
> The MADV_USERFAULT feature should be generic enough that it can
> provide the userfaults to the Android volatile range feature too, on
> access of reclaimed volatile pages.
Maybe.
I certainly can't keep track of all the versions of the variations of
the volatile ranges patches. But, I don't think it's a given that this
can be reused. First of all, volatile ranges is trying to replace
ashmem and is going to require _some_ form of sharing. This mechanism,
being tightly coupled to anonymous memory at the moment, is not a close
fit for that.
It's also important to call out that this is a VMA-based mechanism. I
certainly can't predict what we'll merge for volatile ranges, but not
all of them are VMA-based. We'd also need a mechanism on top of this to
differentiate plain not-present pages from not-present-because-purged pages.
That said, I _think_ this might fit well in to what the Mozilla guys
wanted out of volatile ranges. I'm not confident about it, though.
prev parent reply other threads:[~2014-07-03 15:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1404319816-30229-1-git-send-email-aarcange@redhat.com>
2014-07-03 1:51 ` Andy Lutomirski
[not found] ` <1404319816-30229-9-git-send-email-aarcange@redhat.com>
2014-07-03 1:56 ` [PATCH 08/10] userfaultfd: add new syscall to provide memory externalization Andy Lutomirski
2014-07-03 13:19 ` Andrea Arcangeli
2014-07-03 15:41 ` Dave Hansen [this message]
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