From patchwork Tue Dec 8 05:50:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laszlo Ersek X-Patchwork-Id: 1412468 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=CiplvzyR; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CqrRv10krz9sWC for ; Tue, 8 Dec 2020 17:51:05 +1100 (AEDT) Received: from localhost ([::1]:55042 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kmVup-0002ZP-BA for incoming@patchwork.ozlabs.org; Tue, 08 Dec 2020 00:51:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:33192) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kmVtp-0002Z4-RU for qemu-devel@nongnu.org; Tue, 08 Dec 2020 00:50:57 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:55181) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kmVtn-0003Z8-Az for qemu-devel@nongnu.org; Tue, 08 Dec 2020 00:50:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1607406654; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ItesgZKA2nD/xUa2XNEu0eqFuyuHd9edR9sJmEeeyII=; b=CiplvzyRibiV1iArCIYrbDyxxL8kTJdki2ZDjg0vX7fjc2LNj3Ij706/54RpShbpOsGb6e Bq8qC4py5BIlxJa0jObkgMjWu5tet0meFAAZ7x/U6ZzVq2QIvIMj87UBYoJLX4KnqnjWwh ENNdm3r6Dbu5rdZCanBpMw/kdVuFSj0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-547-RoNy10e1OFOrjNdiuDIBFw-1; Tue, 08 Dec 2020 00:50:52 -0500 X-MC-Unique: RoNy10e1OFOrjNdiuDIBFw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 813C28049C1 for ; Tue, 8 Dec 2020 05:50:51 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-112-30.ams2.redhat.com [10.36.112.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id 89C925D9DE; Tue, 8 Dec 2020 05:50:44 +0000 (UTC) From: Laszlo Ersek To: qemu-devel@nongnu.org, virtio-fs@redhat.com Subject: [PATCH] virtiofsd: make the debug log timestamp on stderr more human-readable Date: Tue, 8 Dec 2020 06:50:43 +0100 Message-Id: <20201208055043.31548-1-lersek@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=lersek@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Cc: "Dr. David Alan Gilbert" , Stefan Hajnoczi Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The current timestamp format doesn't help me visually notice small jumps in time ("small" as defined on human scale, such as a few seconds or a few ten seconds). Replace it with a local time format where such differences stand out. Before: > [13316826770337] [ID: 00000004] unique: 62, opcode: RELEASEDIR (29), nodeid: 1, insize: 64, pid: 1 > [13316826778175] [ID: 00000004] unique: 62, success, outsize: 16 > [13316826781156] [ID: 00000004] virtio_send_msg: elem 0: with 1 in desc of length 16 > [15138279317927] [ID: 00000001] virtio_loop: Got VU event > [15138279504884] [ID: 00000001] fv_queue_set_started: qidx=1 started=0 > [15138279519034] [ID: 00000003] fv_queue_thread: kill event on queue 1 - quitting > [15138280876463] [ID: 00000001] fv_remove_watch: TODO! fd=9 > [15138280897381] [ID: 00000001] virtio_loop: Waiting for VU event > [15138280946834] [ID: 00000001] virtio_loop: Got VU event > [15138281175421] [ID: 00000001] virtio_loop: Waiting for VU event > [15138281182387] [ID: 00000001] virtio_loop: Got VU event > [15138281189474] [ID: 00000001] virtio_loop: Waiting for VU event > [15138309321936] [ID: 00000001] virtio_loop: Unexpected poll revents 11 > [15138309434150] [ID: 00000001] virtio_loop: Exit (Notice how you don't (easily) notice the gap in time after "virtio_send_msg", and especially the amount of time passed is hard to estimate.) After: > [2020-12-08 06:43:22.58+0100] [ID: 00000004] unique: 51, opcode: RELEASEDIR (29), nodeid: 1, insize: 64, pid: 1 > [2020-12-08 06:43:22.58+0100] [ID: 00000004] unique: 51, success, outsize: 16 > [2020-12-08 06:43:22.58+0100] [ID: 00000004] virtio_send_msg: elem 0: with 1 in desc of length 16 > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Got VU event > [2020-12-08 06:43:29.34+0100] [ID: 00000001] fv_queue_set_started: qidx=1 started=0 > [2020-12-08 06:43:29.34+0100] [ID: 00000003] fv_queue_thread: kill event on queue 1 - quitting > [2020-12-08 06:43:29.34+0100] [ID: 00000001] fv_remove_watch: TODO! fd=9 > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Waiting for VU event > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Got VU event > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Waiting for VU event > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Got VU event > [2020-12-08 06:43:29.34+0100] [ID: 00000001] virtio_loop: Waiting for VU event > [2020-12-08 06:43:29.37+0100] [ID: 00000001] virtio_loop: Unexpected poll revents 11 > [2020-12-08 06:43:29.37+0100] [ID: 00000001] virtio_loop: Exit Cc: "Dr. David Alan Gilbert" Cc: Stefan Hajnoczi Signed-off-by: Laszlo Ersek Reviewed-by: Dr. David Alan Gilbert --- tools/virtiofsd/passthrough_ll.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index 48a109d3f682..06543b20dcbb 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -3311,18 +3311,38 @@ static void setup_nofile_rlimit(unsigned long rlimit_nofile) static void log_func(enum fuse_log_level level, const char *fmt, va_list ap) { g_autofree char *localfmt = NULL; + struct timespec ts; + struct tm tm; + char sec_fmt[sizeof "2020-12-07 18:17:54"]; + char zone_fmt[sizeof "+0100"]; if (current_log_level < level) { return; } if (current_log_level == FUSE_LOG_DEBUG) { - if (!use_syslog) { - localfmt = g_strdup_printf("[%" PRId64 "] [ID: %08ld] %s", - get_clock(), syscall(__NR_gettid), fmt); - } else { + if (use_syslog) { + /* no timestamp needed */ localfmt = g_strdup_printf("[ID: %08ld] %s", syscall(__NR_gettid), fmt); + } else { + /* try formatting a broken-down timestamp */ + if (clock_gettime(CLOCK_REALTIME, &ts) != -1 && + localtime_r(&ts.tv_sec, &tm) != NULL && + strftime(sec_fmt, sizeof sec_fmt, "%Y-%m-%d %H:%M:%S", + &tm) != 0 && + strftime(zone_fmt, sizeof zone_fmt, "%z", &tm) != 0) { + localfmt = g_strdup_printf("[%s.%02ld%s] [ID: %08ld] %s", + sec_fmt, + ts.tv_nsec / (10L * 1000 * 1000), + zone_fmt, syscall(__NR_gettid), + fmt); + } else { + /* fall back to a flat timestamp */ + localfmt = g_strdup_printf("[%" PRId64 "] [ID: %08ld] %s", + get_clock(), syscall(__NR_gettid), + fmt); + } } fmt = localfmt; } @@ -3452,6 +3472,9 @@ int main(int argc, char *argv[]) struct lo_map_elem *reserve_elem; int ret = -1; + /* Initialize time conversion information for localtime_r(). */ + tzset(); + /* Don't mask creation mode, kernel already did that */ umask(0);