Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934100AbaGXAiF (ORCPT ); Wed, 23 Jul 2014 20:38:05 -0400 Received: from mail-oa0-f43.google.com ([209.85.219.43]:55843 "EHLO mail-oa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933187AbaGXAiC (ORCPT ); Wed, 23 Jul 2014 20:38:02 -0400 MIME-Version: 1.0 In-Reply-To: <20140723141721.d6a58555f124a7024d010067@linux-foundation.org> References: <1405616598-14798-1-git-send-email-jcmvbkbc@gmail.com> <20140723141721.d6a58555f124a7024d010067@linux-foundation.org> Date: Thu, 24 Jul 2014 04:38:01 +0400 Message-ID: Subject: Re: [PATCH v2] mm/highmem: make kmap cache coloring aware From: Max Filippov To: Andrew Morton Cc: "linux-mm@kvack.org" , Linux-Arch , "Linux/MIPS Mailing List" , "linux-xtensa@linux-xtensa.org" , LKML , Leonid Yegoshin , Chris Zankel , Marc Gauthier Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew, thanks for your feedback, I'll address your points in the next version of this series. On Thu, Jul 24, 2014 at 1:17 AM, Andrew Morton wrote: > Fifthly, it would be very useful to publish the performance testing > results for at least one architecture so that we can determine the > patchset's desirability. And perhaps to motivate other architectures > to implement this. What sort of performance numbers would be relevant? For xtensa this patch enables highmem use for cores with aliasing cache, that is access to a gigabyte of memory (typical on KC705 FPGA board) vs. only 128MBytes of low memory, which is highly desirable. But performance comparison of these two configurations seems to make little sense. OTOH performance comparison of highmem variants with and without cache aliasing would show the quality of our cache flushing code. -- Thanks. -- Max -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/