[dpdk-stable] [PATCH] eal/memory: fix unused SIGBUS handler

[Olivier Matz]

On Wed, Nov 03, 2021 at 09:03:19PM +0100, David Marchand wrote:
> On Fri, Oct 29, 2021 at 11:53 AM Olivier Matz <olivier.matz at 6wind.com> wrote:
> >
> > Since its introduction in 2018, the SIGBUS handler was never registered,
> > and all related functions were unused.
> >
> > A SIGBUS can be received by the application when accessing to hugepages
> > even if mmap() was successful, This happens especially when running
> > inside containers when there is not enough hugepages. In this case, we
> > need to recover. A similar scheme can be found in eal_memory.c.
> >
> > Fixes: 582bed1e1d1d ("mem: support mapping hugepages at runtime")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> 
> This patch lgtm.
> 
> The key point here is that in the "container context" (well, cgroups)
> mmap succeeds regardless of availability of hugepages.
> I would put an emphasis about this in the title.
> 
> What do you think of:
> mem: fix dynamic hugepage mapping in container

Yes it's a better title.