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Re: [Qemu-devel] [PATCH] exec: silence hugetlbfs warning under qtest


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH] exec: silence hugetlbfs warning under qtest
Date: Tue, 24 Nov 2015 16:10:54 +0200

On Mon, Nov 23, 2015 at 06:10:08PM +0000, Daniel P. Berrange wrote:
> On Mon, Nov 23, 2015 at 07:01:33PM +0100, Marc-André Lureau wrote:
> > On Mon, Nov 23, 2015 at 6:40 PM, Paolo Bonzini <address@hidden> wrote:
> > > Before: object-initial, chardev, qtest, object-late (not in the patch)
> > >
> > > After: chardev, qtest, object-initial, object-late (not in the patch)
> > >
> > > Objects must be initialized before chardev (except rng-egd) since in the
> > > future chardev will need to use objects, in particular secret objects.
> > > Was the swap intentional?
> > 
> > Yes, without the swap, qtest was not initialized before memory is allocated.
> > 
> > The alternative I could think of is to check the QTEST_QEMU_BINARY
> > variable: 
> > http://lists.nongnu.org/archive/html/qemu-devel/2015-11/msg01527.html
> 
> Why do we not simply delete the warning message about the path not
> being on hugetlbfs ? ie, why does QEMU try to force a policy that
> a memory-file backend has to be on hugetlbfs, as opposed to on
> a plain tmpfs ?  I've previously had user request that we allow
> use of plain tmpfs, because they want to use vhost-user without
> also using hugepages, and that could be done with plain tmpfs.
> 
> Regards,
> Daniel

Because THP does not work on any other filesystem,
so many workloads are much slower.
That's why it's a warning, not an error.

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