linux-kernel - Re: [PATCH 2/3] x86_64,entry: Use sysret to return to userspace when possible

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Message-ID: <20150108135724.GC20632@pd.tnic>
Date:	Thu, 8 Jan 2015 14:57:24 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>, kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/3] x86_64,entry: Use sysret to return to userspace when
 possible

On Thu, Jan 08, 2015 at 01:29:28PM +0100, Borislav Petkov wrote:
> Ok, dammit, it happened again:

Running -rc+ 2without your first two patches doesn't trigger it. Well,
I don't know what workload even triggered it, it used to happen during
system upgrade. I left the box without your patches to build the kernel
in a loop and went to lunch.

Now I'm back and it all still looks good.

I'll try running only with this second patch, i.e. the ret-to-user
SYSRET speedup thing. See what happens.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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