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From: Andy Lutomirski <luto@amacapital.net>
Date: Fri, 10 Feb 2017 14:58:37 -0800
Message-ID: <CALCETrXSdcgqiSjGWYDVOk9_-ZRUhuehtnw-RmuqpKRZ7qdG5Q@mail.gmail.com>
Subject: Re: PCID review?
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To: Borislav Petkov <bp@alien8.de>
Cc: Mel Gorman <mgorman@techsingularity.net>, Andy Lutomirski <luto@kernel.org>, Nadav Amit <nadav.amit@gmail.com>, Kees Cook <keescook@chromium.org>, Dave Hansen <dave.hansen@linux.intel.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

On Fri, Feb 10, 2017 at 2:25 PM, Borislav Petkov <bp@alien8.de> wrote:
> On Fri, Feb 10, 2017 at 02:07:19PM -0800, Andy Lutomirski wrote:
>> We'll see.  The main benchmark that I'm relying on (so far) is that
>> context switches get way faster, just ping ponging back and forth.  I
>> suspect that the TLB refill cost is only a small part.
>
> Is that a microbenchmark or something more "presentable"?

It's a microbenchmark, but the change is fairly large.  It would be
nice to see what the effect is on real workloads.

>
> We really should pay attention to the complexity and what that actually
> brings us in the end.

Agreed.

--Andy

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