From patchwork Fri Feb 1 13:45:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzvetomir Stoyanov X-Patchwork-Id: 10792805 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5DB44159A for ; Fri, 1 Feb 2019 13:45:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4D4142C68B for ; Fri, 1 Feb 2019 13:45:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 410962F4AB; Fri, 1 Feb 2019 13:45:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 014C42C68B for ; Fri, 1 Feb 2019 13:45:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730205AbfBANpr (ORCPT ); Fri, 1 Feb 2019 08:45:47 -0500 Received: from mail-wr1-f65.google.com ([209.85.221.65]:35046 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729506AbfBANpr (ORCPT ); Fri, 1 Feb 2019 08:45:47 -0500 Received: by mail-wr1-f65.google.com with SMTP id r17so1195430wrp.2 for ; Fri, 01 Feb 2019 05:45:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DDPHLX9eaMTqLJQTXQMe9XyltETeW2phSskHN+UtqUk=; b=LOwFjnqVWpR7EWv+NU5tB6evYt6aWId5oCjBkhHeM5uZDDMXzQqnYJP2SoUQTywaak SABtX4iGCbceNcgJhsxEQ6B3/KSlW6PaRFlW0/EJfWhawXTu68KimYmkW0UJkPy+wnjT 1bNJGz4lwpR67j9YVO6SrNB6Vgr53Z8/D6qBkVZjaPNdZNGJpEtitvVJ5y6fYAREfmwL E31t1EfaPXQnlSX/tDAERUELLBwtobynKHboa/PU60sZXIE8MiMCZpiGJjE85/eIZ7Qk WslDxrncl+CnXnnLXhAKkuRjCjuRm0qzHlkYzR+rFPMJqI43S40Mu7kz3EdjF2/26R8D KHgQ== X-Gm-Message-State: AJcUukerGgEZ96qBp2/KeAYz+TsQSLEl9mukxlTLcsQ6svDp++NcQnkS viwLyjT0ZBQQFrOpHncwj8P6EvE1 X-Google-Smtp-Source: ALg8bN7AYx0k54538mfrQkxXC7Z8kv9aKEVW0Rrp6QOWV6lyJt3G9Oku+JBC9kJrWWGkaySOUIgfCQ== X-Received: by 2002:adf:fdc2:: with SMTP id i2mr40082583wrs.117.1549028744094; Fri, 01 Feb 2019 05:45:44 -0800 (PST) Received: from oberon.zico.biz ([83.222.187.186]) by smtp.gmail.com with ESMTPSA id v26sm1468732wrv.78.2019.02.01.05.45.42 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 01 Feb 2019 05:45:43 -0800 (PST) From: Tzvetomir Stoyanov To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v2 6/6] trace-cmd [POC]: Implemented timestamps synch PTP-like algorithm, using vsock events. Date: Fri, 1 Feb 2019 15:45:35 +0200 Message-Id: <20190201134535.2979-7-tstoyanov@vmware.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190201134535.2979-1-tstoyanov@vmware.com> References: <20190201134535.2979-1-tstoyanov@vmware.com> MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a POC patch, implementing a PTP-like algorithm for syncing timestamps between host and guest machines, using vsock trace events to catch the host / guest time. Signed-off-by: Tzvetomir Stoyanov --- include/trace-cmd/trace-cmd.h | 4 + tracecmd/include/trace-local.h | 5 + tracecmd/trace-listen.c | 3 + tracecmd/trace-msg.c | 307 +++++++++++++++++++++++++++++++-- tracecmd/trace-record.c | 207 +++++++++++++++++++++- 5 files changed, 507 insertions(+), 19 deletions(-) diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index da225b4..7f7e1fc 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -351,6 +351,10 @@ int tracecmd_msg_recv_trace_resp(struct tracecmd_msg_handle *msg_handle, int *nr_cpus, int *page_size, unsigned int **ports); +int tracecmd_msg_rcv_time_sync(struct tracecmd_msg_handle *msg_handle); +int tracecmd_msg_snd_time_sync(struct tracecmd_msg_handle *msg_handle, + char *clock_str, long long *toffset); + int tracecmd_msg_wait_close(struct tracecmd_msg_handle *msg_handle); /* --- Plugin handling --- */ diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h index 823d323..c502c70 100644 --- a/tracecmd/include/trace-local.h +++ b/tracecmd/include/trace-local.h @@ -225,6 +225,11 @@ void show_instance_file(struct buffer_instance *instance, const char *name); int count_cpus(void); +struct buffer_instance *clock_synch_enable(int fd, char *clock, + int *tx_event, int *rx_event); +void clock_synch_disable(int fd, struct buffer_instance *instance); +struct tep_handle *clock_synch_get_tep(struct buffer_instance *instance); + /* No longer in event-utils.h */ void __noreturn die(const char *fmt, ...); /* Can be overriden */ void *malloc_or_die(unsigned int size); /* Can be overridden */ diff --git a/tracecmd/trace-listen.c b/tracecmd/trace-listen.c index 9b50147..7783a68 100644 --- a/tracecmd/trace-listen.c +++ b/tracecmd/trace-listen.c @@ -404,6 +404,9 @@ static int communicate_with_client(struct tracecmd_msg_handle *msg_handle) msg_handle->version = V3_PROTOCOL; + /* time sync with the v3 client */ + tracecmd_msg_rcv_time_sync(msg_handle); + /* read the CPU count, the page size, and options */ if ((pagesize = tracecmd_msg_initial_setting(msg_handle)) < 0) goto out; diff --git a/tracecmd/trace-msg.c b/tracecmd/trace-msg.c index 46b18aa..e264f10 100644 --- a/tracecmd/trace-msg.c +++ b/tracecmd/trace-msg.c @@ -18,9 +18,11 @@ #include #include #include +#include #include #include #include +#include #include "trace-cmd-local.h" #include "trace-local.h" @@ -28,6 +30,8 @@ typedef __u32 u32; typedef __be32 be32; +typedef __u64 u64; +typedef __s64 s64; static inline void dprint(const char *fmt, ...) { @@ -50,11 +54,20 @@ static inline void dprint(const char *fmt, ...) unsigned int page_size; +/* Try a few times to get an accurate time sync */ +#define TSYNC_TRIES 5000 +#define TSYNC_TRESCH 10000 + struct tracecmd_msg_server { struct tracecmd_msg_handle handle; int done; }; +struct clock_synch_event { + int id; + unsigned long long ts; +}; + static struct tracecmd_msg_server * make_server(struct tracecmd_msg_handle *msg_handle) { @@ -90,6 +103,16 @@ struct tracecmd_msg_trace_resp { be32 page_size; } __attribute__((packed)); +struct tracecmd_msg_time_sync_init { + char clock[32]; + s64 toffset; +} __attribute__((packed)); + +struct tracecmd_msg_time_sync { + u64 tlocal_rx; + u64 tlocal_tx; +} __attribute__((packed)); + struct tracecmd_msg_header { be32 size; be32 cmd; @@ -97,13 +120,15 @@ struct tracecmd_msg_header { } __attribute__((packed)); #define MSG_MAP \ - C(CLOSE, 0, 0), \ - C(TINIT, 1, sizeof(struct tracecmd_msg_tinit)), \ - C(RINIT, 2, sizeof(struct tracecmd_msg_rinit)), \ - C(SEND_DATA, 3, 0), \ - C(FIN_DATA, 4, 0), \ - C(TRACE_REQ, 5, sizeof(struct tracecmd_msg_trace_req)), \ - C(TRACE_RESP, 6, sizeof(struct tracecmd_msg_trace_resp)), + C(CLOSE, 0, 0), \ + C(TINIT, 1, sizeof(struct tracecmd_msg_tinit)), \ + C(RINIT, 2, sizeof(struct tracecmd_msg_rinit)), \ + C(SEND_DATA, 3, 0), \ + C(FIN_DATA, 4, 0), \ + C(TRACE_REQ, 5, sizeof(struct tracecmd_msg_trace_req)),\ + C(TRACE_RESP, 6, sizeof(struct tracecmd_msg_trace_resp)),\ + C(TIME_SYNC_INIT, 7, sizeof(struct tracecmd_msg_time_sync_init)),\ + C(TIME_SYNC, 8, sizeof(struct tracecmd_msg_time_sync)), #undef C #define C(a,b,c) MSG_##a = b @@ -133,10 +158,12 @@ static const char *cmd_to_name(int cmd) struct tracecmd_msg { struct tracecmd_msg_header hdr; union { - struct tracecmd_msg_tinit tinit; - struct tracecmd_msg_rinit rinit; - struct tracecmd_msg_trace_req trace_req; - struct tracecmd_msg_trace_resp trace_resp; + struct tracecmd_msg_tinit tinit; + struct tracecmd_msg_rinit rinit; + struct tracecmd_msg_trace_req trace_req; + struct tracecmd_msg_trace_resp trace_resp; + struct tracecmd_msg_time_sync_init time_sync_init; + struct tracecmd_msg_time_sync time_sync; }; union { struct tracecmd_msg_opt *opt; @@ -825,6 +852,264 @@ out: return ret; } +static int +find_events_in_page(struct tep_handle *pevent, void *page, + int size, struct clock_synch_event *events) +{ + struct tep_event *event = NULL; + struct tep_record *last_record = NULL; + struct tep_record *record; + int id, i, j, cnt = 0; + + if (size <= 0) + return 0; + for (i = 0; events[i].id; i++) { + if (!events[i].ts) + cnt++; + } + + while (cnt) { + event = NULL; + record = tracecmd_read_page_record(pevent, page, size, + last_record); + if (!record) + break; + free_record(last_record); + id = tep_data_type(pevent, record); + for (i = 0; events[i].id; i++) + if (!events[i].ts && events[i].id == id) { + event = tep_data_event_from_type(pevent, id); + break; + } + if (event) { + for (j = 0; j < i; j++) + if (events[j].ts && events[j].ts > record->ts) + break; + if (j == i) { + events[i].ts = record->ts; + cnt--; + } + } + last_record = record; + } + free_record(last_record); + + return cnt; +} + +static int clock_synch_find_events(struct tep_handle *tep, + struct buffer_instance *instance, + struct clock_synch_event *events) +{ + struct dirent *dent; + int ts = 0; + void *page; + char *path; + char *file; + DIR *dir; + int len; + int fd; + int r; + + page_size = getpagesize(); + + path = get_instance_file(instance, "per_cpu"); + if (!path) + return ts; + + dir = opendir(path); + if (!dir) + goto out; + + len = strlen(path); + file = malloc(len + strlen("trace_pipe_raw") + 32); + page = malloc(page_size); + if (!file || !page) + die("Failed to allocate time_stamp info"); + + while ((dent = readdir(dir))) { + + const char *name = dent->d_name; + + if (strncmp(name, "cpu", 3) != 0) + continue; + sprintf(file, "%s/%s/trace_pipe_raw", path, name); + fd = open(file, O_RDONLY | O_NONBLOCK); + if (fd < 0) + continue; + do { + r = read(fd, page, page_size); + if (r > 0) { + ts = find_events_in_page(tep, page, r, events); + if (!ts) + break; + } + } while (r > 0); + close(fd); + } + + free(file); + free(page); + closedir(dir); + + out: + tracecmd_put_tracing_file(path); + return ts; +} + +extern struct tep_handle *clock_synch_get_tep(struct buffer_instance *instance); + +int tracecmd_msg_rcv_time_sync(struct tracecmd_msg_handle *msg_handle) +{ + struct buffer_instance *vinst; + struct tracecmd_msg msg; + struct tep_handle *tep; + int ret; + char *clock; + struct clock_synch_event events[3]; + + ret = tracecmd_msg_recv(msg_handle->fd, &msg); + if (ret < 0 || ntohl(msg.hdr.cmd) != MSG_TIME_SYNC_INIT) + return 0; + if (!msg.time_sync_init.clock[0]) + return 0; + + clock = strdup(msg.time_sync_init.clock); + events[2].id = 0; + vinst = clock_synch_enable(msg_handle->fd, clock, + &events[1].id, &events[0].id); + tep = clock_synch_get_tep(vinst); + tracecmd_msg_init(MSG_TIME_SYNC_INIT, &msg); + tracecmd_msg_send(msg_handle->fd, &msg); + + do { + events[0].ts = 0; + events[1].ts = 0; + ret = tracecmd_msg_recv(msg_handle->fd, &msg); + if (ret < 0 || ntohl(msg.hdr.cmd) != MSG_TIME_SYNC) + break; + + tracecmd_msg_send(msg_handle->fd, &msg); + clock_synch_find_events(tep, vinst, events); + tracecmd_msg_init(MSG_TIME_SYNC, &msg); + msg.time_sync.tlocal_tx = htonll(events[1].ts); + msg.time_sync.tlocal_rx = htonll(events[0].ts); + tracecmd_msg_send(msg_handle->fd, &msg); + } while (true); + clock_synch_disable(msg_handle->fd, vinst); + msg_free(&msg); + tep_free(tep); + free(clock); + return ret; +} + +int tracecmd_msg_snd_time_sync(struct tracecmd_msg_handle *msg_handle, + char *clock_str, long long *toffset) +{ + static struct buffer_instance *vinst; + struct clock_synch_event events[4]; + long long *offsets, *replies; + struct tracecmd_msg msg_resp; + struct tracecmd_msg msg_req; + int sync_loop = TSYNC_TRIES; + long long ms_diff, sm_diff; + int j= 0, i = 0, ret = 0; + struct tep_handle *tep; + long long m_t1, m_t4; + long long s_t2, s_t3; + long long t_offs = 0; + long long min_p=0; + char *clock; + + clock = clock_str; + if (!clock) + clock = "local"; + + tracecmd_msg_init(MSG_TIME_SYNC_INIT, &msg_req); + if (toffset == NULL) { + msg_req.time_sync_init.clock[0] = 0; + tracecmd_msg_send(msg_handle->fd, &msg_req); + return 0; + } + offsets = calloc(sizeof(long long), TSYNC_TRIES); + replies = calloc(sizeof(long long), TSYNC_TRIES); + if (!offsets || !replies) { + free(offsets); + free(replies); + return 0; + } + + strncpy(msg_req.time_sync_init.clock, clock, 16); + tracecmd_msg_send(msg_handle->fd, &msg_req); + ret = tracecmd_msg_recv(msg_handle->fd, &msg_resp); + if (ret < 0 || ntohl(msg_resp.hdr.cmd) != MSG_TIME_SYNC_INIT) { + free(offsets); + free(replies); + return 0; + } + events[3].id = 0; + vinst = clock_synch_enable(msg_handle->fd, clock_str, + &events[0].id, &events[1].id); + tep = clock_synch_get_tep(vinst); + *toffset = 0; + + do { + memset(&msg_resp, 0, sizeof(msg_resp)); + events[0].ts = 0; + events[1].ts = 0; + events[2].ts = 0; + tracecmd_msg_init(MSG_TIME_SYNC, &msg_req); + + tracecmd_msg_send(msg_handle->fd, &msg_req); + ret = tracecmd_msg_recv(msg_handle->fd, &msg_resp); + if (ret < 0 || ntohl(msg_resp.hdr.cmd) != MSG_TIME_SYNC) + break; + ret = tracecmd_msg_recv(msg_handle->fd, &msg_resp); + if (ret < 0 || ntohl(msg_resp.hdr.cmd) != MSG_TIME_SYNC) + break; + clock_synch_find_events(tep, vinst, events); + m_t1 = events[0].ts; + m_t4 = events[1].ts; + s_t2 = htonll(msg_resp.time_sync.tlocal_rx); + s_t3 = ntohll(msg_resp.time_sync.tlocal_tx); + if (!m_t1 || !m_t4 || !s_t2 || !s_t3) + continue; + if ( m_t1 >= m_t4) + continue; + ms_diff = s_t2 - m_t1; + sm_diff = m_t4 - s_t3; + offsets[i] = (ms_diff - sm_diff)/2; + replies[i] = abs(sm_diff); + if (!min_p || min_p > replies[i]) + min_p = replies[i]; + i++; + } while (--sync_loop); + clock_synch_disable(msg_handle->fd, vinst); + + for (i=0; ifd, &msg_req); + + msg_free(&msg_req); + msg_free(&msg_resp); + free(offsets); + free(replies); + + *toffset = t_offs; + + return ret; +} + static int make_trace_resp(struct tracecmd_msg *msg, int page_size, int nr_cpus, unsigned int *ports) { diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c index 6d67858..af442fe 100644 --- a/tracecmd/trace-record.c +++ b/tracecmd/trace-record.c @@ -3157,7 +3157,41 @@ static void check_protocol_version(struct tracecmd_msg_handle *msg_handle) } } -static struct tracecmd_msg_handle *setup_network(struct buffer_instance *instance) +static void sync_time_with_listener_v3(struct tracecmd_msg_handle *msg_handle, + struct common_record_context *ctx) +{ + struct buffer_instance *instance; + long long toffset = 0; + char *clock = NULL; + + instance = ctx->instance; + while (instance) { + clock = instance->clock; + if (clock) + break; + instance = instance->next; + } + + if (ctx->data_flags & DATA_FL_DATE || + ctx->data_flags & DATA_FL_OFFSET) { + tracecmd_msg_snd_time_sync(msg_handle, clock, NULL); + return; + } + + tracecmd_msg_snd_time_sync(msg_handle, clock, &toffset); + + free(ctx->date2ts); + /* 20 digits + \0 */ + ctx->date2ts = malloc(21); + if (ctx->date2ts) { + snprintf(ctx->date2ts, 21, "%lld", toffset); + ctx->data_flags |= DATA_FL_OFFSET; + } + +} + +static struct tracecmd_msg_handle *setup_network(struct buffer_instance *instance, + struct common_record_context *ctx) { struct tracecmd_msg_handle *msg_handle = NULL; struct addrinfo hints; @@ -3292,12 +3326,13 @@ static void add_options(struct tracecmd_output *handle, } static struct tracecmd_msg_handle * -setup_connection(struct buffer_instance *instance, struct common_record_context *ctx) +setup_connection(struct buffer_instance *instance, + struct common_record_context *ctx) { struct tracecmd_msg_handle *msg_handle; struct tracecmd_output *network_handle; - msg_handle = setup_network(instance); + msg_handle = setup_network(instance, ctx); /* Now create the handle through this socket */ if (msg_handle->version == V3_PROTOCOL) { @@ -3324,7 +3359,8 @@ static void finish_network(struct tracecmd_msg_handle *msg_handle) free(host); } -static void connect_to_agent(struct buffer_instance *instance) +static void connect_to_agent(struct buffer_instance *instance, + struct common_record_context *ctx) { struct tracecmd_msg_handle *msg_handle; int sd, nr_cpus, page_size; @@ -3350,9 +3386,12 @@ static void connect_to_agent(struct buffer_instance *instance) /* the msg_handle now points to the guest fd */ instance->msg_handle = msg_handle; + + tracecmd_msg_rcv_time_sync(msg_handle); } -static void setup_guest(struct buffer_instance *instance) +static void setup_guest(struct buffer_instance *instance, + struct common_record_context *ctx) { struct tracecmd_msg_handle *msg_handle = instance->msg_handle; char *file; @@ -3374,10 +3413,13 @@ static void setup_guest(struct buffer_instance *instance) close(fd); } -static void setup_agent(struct buffer_instance *instance, struct common_record_context *ctx) +static void setup_agent(struct buffer_instance *instance, + struct common_record_context *ctx) { struct tracecmd_output *network_handle; + sync_time_with_listener_v3(instance->msg_handle, ctx); + network_handle = tracecmd_create_init_fd_msg(instance->msg_handle, listed_events); add_options(network_handle, ctx); @@ -3397,7 +3439,7 @@ void start_threads(enum trace_type type, struct common_record_context *ctx) for_all_instances(instance) { /* Start the connection now to find out how many CPUs we need */ if (instance->flags & BUFFER_FL_GUEST) - connect_to_agent(instance); + connect_to_agent(instance, ctx); total_cpu_count += instance->cpu_count; } @@ -3413,7 +3455,7 @@ void start_threads(enum trace_type type, struct common_record_context *ctx) if (instance->flags & BUFFER_FL_AGENT) { setup_agent(instance, ctx); } else if (instance->flags & BUFFER_FL_GUEST) { - setup_guest(instance); + setup_guest(instance, ctx); } else if (host) { instance->msg_handle = setup_connection(instance, ctx); if (!instance->msg_handle) @@ -5769,3 +5811,152 @@ int trace_record_agent(struct tracecmd_msg_handle *msg_handle, free(argv_plus); return 0; } + +static void get_vsocket_params(int fd, int *lcid, + int *lport, int *rcid, int *rport) +{ + struct sockaddr_vm addr; + socklen_t addr_len = sizeof(addr); + + memset(&addr, 0, sizeof(addr)); + if (getsockname(fd, (struct sockaddr *)&addr, &addr_len)) + return; + if (addr.svm_family != AF_VSOCK) + return; + *lport = addr.svm_port; + *lcid = addr.svm_cid; + + memset(&addr, 0, sizeof(addr)); + addr_len = sizeof(addr); + if (getpeername(fd, (struct sockaddr *)&addr, &addr_len)) + return; + if (addr.svm_family != AF_VSOCK) + return; + + *rport = addr.svm_port; + *rcid = addr.svm_cid; +} + +static void set_clock_synch_events(int cfd, struct buffer_instance *instance, + bool enable, int *tx_event, int *rx_event) +{ + int lcid, lport, rcid, rport; + char buffer[255]; + FILE *fp; + char *path; + int fd; + + path = get_instance_file(instance, "events/vsock/enable"); + fd = open(path, O_WRONLY); + if (fd < 0) + return; + if (enable) + write(fd, "1", 2); + else + write(fd, "0", 2); + close(fd); + tracecmd_put_tracing_file(path); + + if (enable) { + get_vsocket_params(cfd, &lcid, &lport, &rcid, &rport); + + snprintf(buffer, 255, + "src_cid==%d && src_port==%d && dst_cid==%d && dst_port==%d && len!=0", + rcid, rport, lcid, lport); + path = get_instance_file(instance, + "events/vsock/virtio_transport_recv_pkt/filter"); + fd = open(path, O_WRONLY); + write(fd, buffer, strlen(buffer)+1); + close(fd); + tracecmd_put_tracing_file(path); + + snprintf(buffer, 255, + "src_cid==%d && src_port==%d && dst_cid==%d && dst_port==%d && len!=0", + lcid, lport, rcid, rport); + path = get_instance_file(instance, + "events/vsock/virtio_transport_alloc_pkt/filter"); + fd = open(path, O_WRONLY); + write(fd, buffer, strlen(buffer)+1); + close(fd); + tracecmd_put_tracing_file(path); + + if (tx_event) { + path = get_instance_file(instance, + "events/vsock/virtio_transport_alloc_pkt/id"); + fp = fopen(path, "r"); + fgets(buffer, 255, (FILE *) fp); + *tx_event = atoi(buffer); + fclose(fp); + tracecmd_put_tracing_file(path); + } + if (rx_event) { + path = get_instance_file(instance, + "events/vsock/virtio_transport_recv_pkt/id"); + fp = fopen(path, "r"); + fgets(buffer, 255, (FILE *) fp); + *rx_event = atoi(buffer); + fclose(fp); + tracecmd_put_tracing_file(path); + } + } + + path = get_instance_file(instance, "events/vsock/enable"); + + if (enable) + write_tracing_on(instance, 1); + else + write_tracing_on(instance, 0); +} + +static void vsock_trace_reset(struct buffer_instance *vinst) +{ + char *path; + int fd; + + path = get_instance_file(vinst, "trace"); + fd = open(path, O_WRONLY); + tracecmd_put_tracing_file(path); + write(fd, "0", 2); + close(fd); +} + +struct tep_handle *clock_synch_get_tep(struct buffer_instance *instance) +{ + struct tep_handle *tep = NULL; + char *systems[] = {"vsock", "kvm", NULL}; + char *path; + + path = get_instance_dir(instance); + tep = tracecmd_local_events_system(path, systems); + tracecmd_put_tracing_file(path); + + tep_set_file_bigendian(tep, tracecmd_host_bigendian()); + tep_set_host_bigendian(tep, tracecmd_host_bigendian()); + + return tep; +} + +struct buffer_instance *clock_synch_enable(int fd, char *clock, + int *tx_event, int *rx_event) +{ + char inst_name[256]; + struct buffer_instance *vinst; + + snprintf(inst_name, 256, "clock_synch-%d", rand()%100); + vinst = create_instance(strdup(inst_name)); + init_instance(vinst); + vinst->cpu_count = local_cpu_count; + make_one_instance(vinst); + vsock_trace_reset(vinst); + vinst->clock = strdup(clock); + set_clock(vinst); + set_clock_synch_events(fd, vinst, true, tx_event, rx_event); + return vinst; +} + +void clock_synch_disable(int fd, struct buffer_instance *instance) +{ + set_clock_synch_events(fd, instance, false, NULL, NULL); + tracecmd_remove_one_instance(instance); + /* todo: clean up the instance */ +}