Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1753502AbdGCK4y (ORCPT <rfc822;w@1wt.eu>);
        Mon, 3 Jul 2017 06:56:54 -0400
Received: from Galois.linutronix.de ([146.0.238.70]:42917 "EHLO
        Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752658AbdGCK4x (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 3 Jul 2017 06:56:53 -0400
Date: Mon, 3 Jul 2017 12:56:45 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Andy Lutomirski <luto@kernel.org>
cc: x86@kernel.org, linux-kernel@vger.kernel.org,
        Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Nadav Amit <nadav.amit@gmail.com>, Rik van Riel <riel@redhat.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using
 PCID
In-Reply-To: <cf600d28712daa8e2222c08a10f6c914edab54f2.1498751203.git.luto@kernel.org>
Message-ID: <alpine.DEB.2.20.1707031255520.2188@nanos>
References: <cover.1498751203.git.luto@kernel.org> <cf600d28712daa8e2222c08a10f6c914edab54f2.1498751203.git.luto@kernel.org>
User-Agent: Alpine 2.20 (DEB 67 2015-01-07)
MIME-Version: 1.0
Content-Type: multipart/mixed; BOUNDARY="8323329-1251026268-1499079405=:2188"
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 957
Lines: 25

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--8323329-1251026268-1499079405=:2188
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT

On Thu, 29 Jun 2017, Andy Lutomirski wrote:
> ping-pong between two mms on the same CPU using eventfd:
>   patched:         1.22µs
>   patched, nopcid: 1.33µs
>   unpatched:       1.34µs
> 
> Same ping-pong, but now touch 512 pages (all zero-page to minimize
> cache misses) each iteration.  dTLB misses are measured by
> dtlb_load_misses.miss_causes_a_walk:
>   patched:         1.8µs  11M  dTLB misses
>   patched, nopcid: 6.2µs, 207M dTLB misses
>   unpatched:       6.1µs, 190M dTLB misses
> 
> Reviewed-by: Nadav Amit <nadav.amit@gmail.com>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
--8323329-1251026268-1499079405=:2188--