linux-kernel - Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

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]

Date:	Tue, 26 Feb 2008 19:52:41 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Gleb Natapov <glebn@...taire.com>
Cc:	Robin Holt <holt@....com>, steiner@....com,
	Andrea Arcangeli <andrea@...ranet.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Izik Eidus <izike@...ranet.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	kvm-devel@...ts.sourceforge.net, daniel.blueman@...drics.com,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	Christoph Lameter <clameter@....com>
Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

On Tuesday 26 February 2008 18:21, Gleb Natapov wrote:
> On Tue, Feb 26, 2008 at 05:11:32PM +1100, Nick Piggin wrote:
> > > You are missing one point here.  The MPI specifications that have
> > > been out there for decades do not require the process use a library
> > > for allocating the buffer.  I realize that is a horrible shortcoming,
> > > but that is the world we live in.  Even if we could change that spec,
> >
> > Can you change the spec?
>
> Not really. It will break all existing codes.

I meant as in eg. submit changes to MPI-3


> MPI-2 provides a call for 
> memory allocation (and it's beneficial to use this call for some
> interconnects), but many (most?) applications are still written for MPI-1
> and those that are written for MPI-2 mostly uses the old habit of
> allocating memory by malloc(), or even use stack or BSS memory for
> communication buffer purposes.

OK, so MPI-2 already has some way to do that... I'm not saying that we
can now completely dismiss the idea of using notifiers for this, but it
is just a good data point to know.

Thanks,
Nick

--
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/