From nobody Tue Feb 10 09:24:54 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1486402677276947.1590128959862; Mon, 6 Feb 2017 09:37:57 -0800 (PST) Received: from localhost ([::1]:49863 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1canEi-0007H0-0v for importer@patchew.org; Mon, 06 Feb 2017 12:37:56 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45355) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1canAC-0003t7-DG for qemu-devel@nongnu.org; Mon, 06 Feb 2017 12:33:17 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1canAB-0006Pf-DR for qemu-devel@nongnu.org; Mon, 06 Feb 2017 12:33:16 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56464) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1canAB-0006PQ-7O for qemu-devel@nongnu.org; Mon, 06 Feb 2017 12:33:15 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 63F2B63144 for ; Mon, 6 Feb 2017 17:33:15 +0000 (UTC) Received: from dgilbert-t530.redhat.com (ovpn-117-81.ams2.redhat.com [10.36.117.81]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v16HX8RA012611; Mon, 6 Feb 2017 12:33:14 -0500 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, quintela@redhat.com Date: Mon, 6 Feb 2017 17:32:55 +0000 Message-Id: <20170206173306.20603-6-dgilbert@redhat.com> In-Reply-To: <20170206173306.20603-1-dgilbert@redhat.com> References: <20170206173306.20603-1-dgilbert@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Mon, 06 Feb 2017 17:33:15 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 05/16] postcopy: enhance ram_block_discard_range for hugepages X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aarcange@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Unfortunately madvise DONTNEED doesn't work on hugepagetlb so use fallocate(FALLOC_FL_PUNCH_HOLE) qemu_fd_getpagesize only sets the page based off a file if the file is from hugetlbfs. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Laurent Vivier --- exec.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/exec.c b/exec.c index e040cdf..c25f6b3 100644 --- a/exec.c +++ b/exec.c @@ -3324,9 +3324,20 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t s= tart, size_t length) =20 errno =3D ENOTSUP; /* If we are missing MADVISE etc */ =20 + if (rb->page_size =3D=3D qemu_host_page_size) { #if defined(CONFIG_MADVISE) - ret =3D qemu_madvise(host_startaddr, length, QEMU_MADV_DONTNEED); + ret =3D qemu_madvise(host_startaddr, length, QEMU_MADV_DONTNEE= D); #endif + } else { + /* Huge page case - unfortunately it can't do DONTNEED, but + * it can do the equivalent by FALLOC_FL_PUNCH_HOLE in the + * huge page file. + */ +#ifdef CONFIG_FALLOCATE_PUNCH_HOLE + ret =3D fallocate(rb->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEE= P_SIZE, + start, length); +#endif + } if (ret) { ret =3D -errno; error_report("ram_block_discard_range: Failed to discard range= " --=20 2.9.3