From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f198.google.com (mail-qk0-f198.google.com [209.85.220.198]) by kanga.kvack.org (Postfix) with ESMTP id 986EA6B0005 for ; Fri, 15 Apr 2016 18:19:47 -0400 (EDT) Received: by mail-qk0-f198.google.com with SMTP id t184so104252291qkh.3 for ; Fri, 15 Apr 2016 15:19:47 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id 188si36004766qhj.38.2016.04.15.15.19.46 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 15 Apr 2016 15:19:47 -0700 (PDT) Date: Fri, 15 Apr 2016 18:19:43 -0400 From: Andrea Arcangeli Subject: Re: post-copy is broken? Message-ID: <20160415221943.GJ9976@redhat.com> References: <20160413080545.GA2270@work-vm> <20160413114103.GB2270@work-vm> <20160413125053.GC2270@work-vm> <20160413205132.GG26364@redhat.com> <20160414123441.GF2252@work-vm> <20160414162230.GC9976@redhat.com> <20160415125236.GA3376@node.shutemov.name> <20160415134233.GG2229@work-vm> <20160415152330.GB3376@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160415152330.GB3376@node.shutemov.name> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: "Dr. David Alan Gilbert" , kirill.shutemov@linux.intel.com, "Li, Liang Z" , Amit Shah , "qemu-devel@nongnu.org" , "quintela@redhat.com" , linux-mm@kvack.org On Fri, Apr 15, 2016 at 06:23:30PM +0300, Kirill A. Shutemov wrote: > The same here. Freshly booted machine with 64GiB ram. I've checked > /proc/vmstat: huge pages were allocated I tried the test in a loop and I can't reproduce it here. Tested with gcc 4.9.3 and glibc 2.21 and glibc 2.22 so far, qemu&kernel/KVM latest upstream (4.6-rc3..). You can run this in between each invocation to guarantee all memory is backed by THP (no need of reboot): # echo 3 >/proc/sys/vm/drop_caches # echo >/proc/sys/vm/compact_memory 4.5 kernel built with gcc 5.3.1 run on a older userland worked fine too. Next thing to test would be if there's something wrong with qemu built with gcc 5.3.1 if run on top of a 4.4 kernel? -- 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