From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f70.google.com (mail-wm0-f70.google.com [74.125.82.70]) by kanga.kvack.org (Postfix) with ESMTP id 0615C6B0278 for ; Wed, 26 Oct 2016 14:04:36 -0400 (EDT) Received: by mail-wm0-f70.google.com with SMTP id l124so6705550wml.4 for ; Wed, 26 Oct 2016 11:04:35 -0700 (PDT) Received: from mx5-phx2.redhat.com (mx5-phx2.redhat.com. [209.132.183.37]) by mx.google.com with ESMTPS id b10si11979081wmg.7.2016.10.26.11.04.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Oct 2016 11:04:34 -0700 (PDT) Date: Wed, 26 Oct 2016 14:04:03 -0400 (EDT) From: Bob Peterson Message-ID: <996124132.13035408.1477505043741.JavaMail.zimbra@redhat.com> In-Reply-To: References: Subject: Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds Cc: Andy Lutomirski , Andreas Gruenbacher , Peter Zijlstra , Andy Lutomirski , LKML , Steven Whitehouse , Mel Gorman , linux-mm ----- Original Message ----- | On Wed, Oct 26, 2016 at 10:15 AM, Linus Torvalds | wrote: | > | > Oh, and the patch is obviously entirely untested. I wouldn't want to | > ruin my reputation by *testing* the patches I send out. What would be | > the fun in that? | | So I tested it. It compiles, and it actually also solves the | performance problem I was complaining about a couple of weeks ago with | "unlock_page()" having an insane 3% CPU overhead when doing lots of | small script ("make -j16 test" in the git tree for those that weren't | involved in the original thread three weeks ago). | | So quite frankly, I'll just commit it. It should fix the new problem | with gfs2 and CONFIG_VMAP_STACK, and I see no excuse for the crazy | zone stuff considering how harmful it is to everybody else. | | I expect that when the NUMA people complain about page locking (if | they ever even notice), PeterZ will stand up like the hero he is, and | say "look here, I can solve this for you". | | Linus | I can test it for you, if you give me about an hour. Bob Peterson -- 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