linux-kernel - Re: [PATCH] xen: privcmd: schedule() after private hypercall when non CONFIG

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Message-ID: <CAB=NE6Xt3QhuKvUm-+-iD4pThsmLZ7oq1nnQbL0Hcw8Q0fpEqw@mail.gmail.com>
Date:	Thu, 27 Nov 2014 13:46:34 -0500
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Juergen Gross <jgross@...e.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	boris.ostrovsky@...cle.com, xen-devel@...ts.xenproject.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	x86@...nel.org, kvm@...r.kernel.org,
	Davidlohr Bueso <dbueso@...e.de>,
	Joerg Roedel <jroedel@...e.de>, Borislav Petkov <bp@...e.de>,
	Jan Beulich <JBeulich@...e.com>, Olaf Hering <ohering@...e.de>
Subject: Re: [PATCH] xen: privcmd: schedule() after private hypercall when non CONFIG_PREEMPT

On Thu, Nov 27, 2014 at 1:36 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> I'm afraid we don't have much leg room.

Let me be clear, I still think putting some hypercalls in process
context *might help* but because of notes 1) and 2) I highlighted I
think this is the best we can do, with more information we should be
able to consider weighing pros / cons with actual metrics from
alternatives, without more information we're just shooting in the dark
and the last thing I want is to see APIs abused or setting precedents.

  Luis
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