Re: [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice (was: Pre-emption control for userspace)

[Rik van Riel]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 11/25/2014 01:30 AM, Davidlohr Bueso wrote:
> On Mon, 2014-11-24 at 21:03 -0500, Rik van Riel wrote:
>> I can see this "solution" help mostly with userspace spinlocks, 
>> which are relics of a past era that need to die. There is no way
>> userspace spinlocks will not fail miserably on virtual machines,
>> and it is time to get rid of them.
> 
> No, not really. Spinlocks are still very useful on bare metal. 
> Virtualization is not the only thing out there.

How many people are going to build two different binaries,
one for bare metal, and one for virtualized environments?

I suspect the vast majority of applications will only be
built once, and it would be nice if it wasn't using a
locking scheme that broke horribly on a significant part
of the deployments...

- -- 
All rights reversed
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJUdIY6AAoJEM553pKExN6DaisH+wWzTc+onHTsPUXs6EU/s+sa
lp3KFWmRQACPjiWSyIfg7aWFxakiS8BQ4ypbXdC/55lHuX/KMm/1k3zZF/lHiyYA
vIwfPUX7TnZxgYGVGk++nrCTffQImAc5RXlCBU6Hp6dHxV5Pead6S9afO8dfOeVu
80cpsqCyUqX+jhMDKq6NkIE0mCMb/U4L0cqo7m67h7PTlWmj8V64PKJjvkDu48O1
tPd+6jj4xDoEl8dde00EMaYETA6Utngt8+LslV1hMB1nxn82aNIGJnEqQco4WGXH
gE8Pkn+iToBe1hPF63MVZFJHRzXPUOAoaBCTgu7+l9LLDkfBgv2A/ckh5NLUrd8=
=41Jl
-----END PGP SIGNATURE-----
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/