From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f50.google.com (mail-qg0-f50.google.com [209.85.192.50]) by kanga.kvack.org (Postfix) with ESMTP id 8C9A26B0253 for ; Mon, 14 Sep 2015 17:41:08 -0400 (EDT) Received: by qgx61 with SMTP id 61so127447284qgx.3 for ; Mon, 14 Sep 2015 14:41:08 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id 188si14008360qhe.57.2015.09.14.14.41.07 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Sep 2015 14:41:08 -0700 (PDT) Date: Mon, 14 Sep 2015 14:41:06 -0700 From: Andrew Morton Subject: Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp performance Message-Id: <20150914144106.ee205c3ae3f4ec0e5202c9fe@linux-foundation.org> In-Reply-To: <1442259105-4420-1-git-send-email-ebru.akagunduz@gmail.com> References: <1442259105-4420-1-git-send-email-ebru.akagunduz@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Ebru Akagunduz Cc: linux-mm@kvack.org, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, aarcange@redhat.com, riel@redhat.com, iamjoonsoo.kim@lge.com, xiexiuqi@huawei.com, gorcunov@openvz.org, linux-kernel@vger.kernel.org, mgorman@suse.de, rientjes@google.com, vbabka@suse.cz, aneesh.kumar@linux.vnet.ibm.com, hughd@google.com, hannes@cmpxchg.org, mhocko@suse.cz, boaz@plexistor.com, raindel@mellanox.com On Mon, 14 Sep 2015 22:31:42 +0300 Ebru Akagunduz wrote: > This patch series makes swapin readahead up to a > certain number to gain more thp performance and adds > tracepoint for khugepaged_scan_pmd, collapse_huge_page, > __collapse_huge_page_isolate. I'll merge this series for testing. Hopefully Andrea and/or Hugh will find time for a quality think about the issue before 4.3 comes around. It would be much better if we didn't have that sysfs knob - make the control automatic in some fashion. If we can't think of a way of doing that then at least let's document max_ptes_swap very carefully. Explain to our users what it does, why they should care about it, how they should set about determining (ie: measuring) its effect upon their workloads. -- 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