[dpdk-stable] patch 'mem: mark pages as not accessed when reserving VA' has been queued to stable release 19.11.3

[Luca Boccassi]

On Tue, 2020-06-09 at 14:45 +0100, Kevin Traynor wrote:
> On 19/05/2020 13:53, luca.boccassi at gmail.com wrote:
> > Hi,
> > 
> > FYI, your patch has been queued to stable release 19.11.3
> > 
> > Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
> > It will be pushed if I get no objections before 05/21/20. So please
> > shout if anyone has objections.
> > 
> > Also note that after the patch there's a diff of the upstream commit vs the
> > patch applied to the branch. This will indicate if there was any rebasing
> > needed to apply to the stable branch. If there were code changes for rebasing
> > (ie: not only metadata diffs), please double check that the rebase was
> > correctly done.
> > 
> > Thanks.
> > 
> > Luca Boccassi
> > 
> > ---
> > From d0e456e9b1af8594ed22382e33bc6e1d5acec994 Mon Sep 17 00:00:00 2001
> > From: David Marchand <david.marchand at redhat.com>
> > Date: Mon, 9 Mar 2020 15:54:42 +0100
> > Subject: [PATCH] mem: mark pages as not accessed when reserving VA
> > 
> > [ upstream commit 8a4baf06c17a806696fb10aba36fce7471983028 ]
> > 
> > When the memory allocator reserves virtual addresses, it still does not
> > know what they will be used for.
> > Besides, huge areas are reserved for memory hotplug in multiprocess
> > setups. But most of the pages are unused in the whole life of the
> > processes.
> > 
> > Change protection mode to PROT_NONE when only reserving VA.
> > The memory allocator already switches to the right mode when making use
> > of it.
> > 
> > It also has the nice effect of getting those pages skipped by the kernel
> > when calling mlockall() or when a coredump gets generated.
> > 
> 
> Hi, discussed this patch for 18.11 with David and he pointed out that
> there is a fix for it on master:

Uh, I wonder how it got left behind, strange - how critical is it? And
how safe is it to pick up now, when validation has already started?

-- 
Kind regards,
Luca Boccassi