From nobody Sat Feb 7 07:41:16 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=crudebyte.com ARC-Seal: i=1; a=rsa-sha256; t=1576680545; cv=none; d=zohomail.com; s=zohoarc; b=EiMYAlZD18HuGGaOEmOQ2mS0rYzQMyY/aJAlDRDLmwWtrVNo5+SLym3OsrhJchmEHkOKZ9bGVNT4YzSGOCR7iZgGY4XaEBEzo1Od5aV0aLlM0y5TRgJZ6hIQuOAekB7+LIDUl9me/VbVH0zvCXzwOm8INbDz54IzOqIhGK9pnsI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1576680545; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=iK1ghDnL3doRVpTkI0ecqERy9JQWkEzcyIFDl/0Jn9g=; b=EuDNjiN46PBsASmCFVmIZkAn7ECih9ch7IfiQLtkCsaR17xpW3HtZRJTCuDKV32a3AxORXHITT8ts0KMaUWdSzUrr4uLWTEKJv7mOq/O8tEG8lmga3mTctQcwqfl4sUJXFVYHqsx4wOWcDL8zUy07iQiLbwPBy6l58rd3niaF6g= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1576680544712175.99646900186917; Wed, 18 Dec 2019 06:49:04 -0800 (PST) Received: from localhost ([::1]:55276 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihadJ-0006UA-6l for importer@patchew.org; Wed, 18 Dec 2019 09:49:01 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51383) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihacS-00062h-TQ for qemu-devel@nongnu.org; Wed, 18 Dec 2019 09:48:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ihacQ-00012I-N2 for qemu-devel@nongnu.org; Wed, 18 Dec 2019 09:48:08 -0500 Received: from lizzy.crudebyte.com ([91.194.90.13]:42647) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ihacQ-0005m7-5p for qemu-devel@nongnu.org; Wed, 18 Dec 2019 09:48:06 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=crudebyte.com; s=lizzy; h=Subject:Date:Cc:To:From:References:In-Reply-To: Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Content-ID: Content-Description; bh=iK1ghDnL3doRVpTkI0ecqERy9JQWkEzcyIFDl/0Jn9g=; b=cOTW7 say2fBIeq/ANafmE3xAkYsFxCmSjI87oStQWt5vd/cYLcwZv26edeQ9Z3UHU3jjdOH6iXWru8M3oo 3sTZy1b+9V5GVJy4el8+KU8ZBPqNSQP7WetY3S8doOnoVvPyGuRHU76GOpfS04lP+EbSshI4aVdXc 8zPuYIQRvZAxjxOOoD/UQG0qVkOevl3mLnk1VicpcW4peXT8X7hCZ+iU52c6pjfPjT8lAeuEt2vC8 mQH1TGsyzsro5d0aBc320K5UnuZoJ22ZE7w9hurxF7wPKnQbuuEpIz2pTpLEbIjbq9jmzoN2+C3k2 Pgh0LZPdoW9lYoeM/qpKLgWRZkAAA==; Message-Id: In-Reply-To: References: From: Christian Schoenebeck To: qemu-devel@nongnu.org Cc: Greg Kurz Date: Wed, 18 Dec 2019 15:10:46 +0100 Subject: [PATCH v2 9/9] hw/9pfs/9p.c: benchmark time on T_readdir request X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 91.194.90.13 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @crudebyte.com) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This patch is not intended to be merged, it measures and prints the time the 9p server spends on handling a T_readdir request. It prints the total time it spent on handling the request, and also the time it spent on I/O (fs driver) only. Signed-off-by: Christian Schoenebeck --- hw/9pfs/9p.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index a7d36b6350..c6f70b96ee 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -2299,6 +2299,15 @@ static void v9fs_free_dirents(struct V9fsDirEnt *e) } } =20 +static double wall_time(void) +{ + struct timeval t; + struct timezone tz; + gettimeofday(&t, &tz); + return t.tv_sec + t.tv_usec * 0.000001; +} + + static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, int32_t max_count) { @@ -2318,6 +2327,8 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu,= V9fsFidState *fidp, */ const bool dostat =3D pdu->s->ctx.export_flags & V9FS_REMAP_INODES; =20 + const double start =3D wall_time(); + /* * Fetch all required directory entries altogether on a background IO * thread from fs driver. We don't want to do that for each entry @@ -2332,6 +2343,10 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu= , V9fsFidState *fidp, } count =3D 0; =20 + const double end =3D wall_time(); + printf("\n\nTime 9p server spent on synth_readdir() I/O only (synth " + "driver): %fs\n", end - start); + for (struct V9fsDirEnt *e =3D entries; e; e =3D e->next) { dent =3D e->dent; =20 @@ -2404,6 +2419,8 @@ static void coroutine_fn v9fs_readdir(void *opaque) V9fsPDU *pdu =3D opaque; V9fsState *s =3D pdu->s; =20 + const double start =3D wall_time(); + retval =3D pdu_unmarshal(pdu, offset, "dqd", &fid, &initial_offset, &max_count); if (retval < 0) { @@ -2447,6 +2464,10 @@ out: put_fid(pdu, fidp); out_nofid: pdu_complete(pdu, retval); + + const double end =3D wall_time(); + printf("Time 9p server spent on entire T_readdir request: %fs " + "[IMPORTANT]\n", end - start); } =20 static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, --=20 2.20.1