From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ee0-f47.google.com (mail-ee0-f47.google.com [74.125.83.47]) by kanga.kvack.org (Postfix) with ESMTP id 3890D6B0070 for ; Tue, 22 Apr 2014 17:34:08 -0400 (EDT) Received: by mail-ee0-f47.google.com with SMTP id b15so135908eek.34 for ; Tue, 22 Apr 2014 14:34:07 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id o46si100102eem.9.2014.04.22.14.34.05 for ; Tue, 22 Apr 2014 14:34:06 -0700 (PDT) Message-ID: <5356E041.3060709@redhat.com> Date: Tue, 22 Apr 2014 17:33:53 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 6/6] x86: mm: set TLB flush tunable to sane value (33) References: <20140421182418.81CF7519@viggo.jf.intel.com> <20140421182428.FC2104C1@viggo.jf.intel.com> In-Reply-To: <20140421182428.FC2104C1@viggo.jf.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen , x86@kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, mgorman@suse.de, ak@linux.intel.com, alex.shi@linaro.org, dave.hansen@linux.intel.com On 04/21/2014 02:24 PM, Dave Hansen wrote: > From: Dave Hansen > > This has been run through Intel's LKP tests across a wide range > of modern sytems and workloads and it wasn't shown to make a > measurable performance difference positive or negative. > > Now that we have some shiny new tracepoints, we can actually > figure out what the heck is going on. > > During a kernel compile, 60% of the flush_tlb_mm_range() calls > are for a single page. It breaks down like this: > Signed-off-by: Dave Hansen Acked-by: Rik van Riel -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org