linux-kernel - Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

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Message-ID: <CALCETrXaie32-0=zFmEqxsCKXA6y6KyYorxC5798e6e9cYayGA@mail.gmail.com>
Date:	Thu, 1 May 2014 14:53:10 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

On Thu, May 1, 2014 at 2:51 PM, Andi Kleen <andi@...stfloor.org> wrote:
>> Allowing userspace to prevent itself from being rescheduled by loading
>> something strange into gsbase seems unfortunate.
>
> The timer tick will eventually catch it, so any delay is tightly
> bounded.
>

What about NO_HZ_FULL?


> Also still gets rescheduled most of the time, just not when a paranoid
> exception handler is running.

If rescheduling on exit from a paranoid exception handler isn't
important, then let's just remove it.  Otherwise let's keep it
working.

--Andy
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