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Tue, 21 Jan 2020 12:29:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579609822; 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: in-reply-to:in-reply-to:references:references; bh=Psgch6gQfws+M0NJ1hFNRZjxN6CZdd3GQ5pzx8YG+kA=; b=iZSjaUTbQsWhGphhvE6mf/TTsLwd3FNn+Rzq53i/KG2SS5VzVsOJWsHLbM9RCaOwXKCDOu yN54F8rTLZiP1F7tjtc097edc6P343bqKCmGsrh112oUOvln13KonicnIA/WF16PFyuEIC WvcozyG2ZLp5nfOEDcq48SgqkE4b0ts= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com, berrange@redhat.com, slp@redhat.com, philmd@redhat.com Subject: [PATCH v2 061/109] virtiofsd: Add ID to the log with FUSE_LOG_DEBUG level Date: Tue, 21 Jan 2020 12:23:45 +0000 Message-Id: <20200121122433.50803-62-dgilbert@redhat.com> In-Reply-To: <20200121122433.50803-1-dgilbert@redhat.com> References: <20200121122433.50803-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: f_RQrECcOE6Zcc4wrECY_w-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: m.mizuma@jp.fujitsu.com, misono.tomohiro@jp.fujitsu.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Masayoshi Mizuma virtiofsd has some threads, so we see a lot of logs with debug option. It would be useful for debugging if we can identify the specific thread from the log. Add ID, which is got by gettid(), to the log with FUSE_LOG_DEBUG level so that we can grep the specific thread. The log is like as: ]# ./virtiofsd -d -o vhost_user_socket=3D/tmp/vhostqemu0 -o source=3D/tmp= /share0 -o cache=3Dauto ... [ID: 00000097] unique: 12696, success, outsize: 120 [ID: 00000097] virtio_send_msg: elem 18: with 2 in desc of length 120 [ID: 00000003] fv_queue_thread: Got queue event on Queue 1 [ID: 00000003] fv_queue_thread: Queue 1 gave evalue: 1 available: in: 655= 52 out: 80 [ID: 00000003] fv_queue_thread: Waiting for Queue 1 event [ID: 00000071] fv_queue_worker: elem 33: with 2 out desc of length 80 bad= _in_num=3D0 bad_out_num=3D0 [ID: 00000071] unique: 12694, opcode: READ (15), nodeid: 2, insize: 80, p= id: 2014 [ID: 00000071] lo_read(ino=3D2, size=3D65536, off=3D131072) Signed-off-by: Masayoshi Mizuma Signed-off-by: Dr. David Alan Gilbert added rework as suggested by Daniel P. Berrang=C3=A9 during review --- tools/virtiofsd/passthrough_ll.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 20b5a242cb..991de69334 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include @@ -2267,10 +2268,17 @@ static void setup_nofile_rlimit(void) =20 static void log_func(enum fuse_log_level level, const char *fmt, va_list a= p) { + g_autofree char *localfmt =3D NULL; + if (current_log_level < level) { return; } =20 + if (current_log_level =3D=3D FUSE_LOG_DEBUG) { + localfmt =3D g_strdup_printf("[ID: %08ld] %s", syscall(__NR_gettid= ), fmt); + fmt =3D localfmt; + } + if (use_syslog) { int priority =3D LOG_ERR; switch (level) { --=20 2.24.1