From patchwork Tue Jan 8 15:00:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Slavomir Kaslev X-Patchwork-Id: 10760235 Return-Path: Received: from mail-pl1-f193.google.com ([209.85.214.193]:39666 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727678AbfAHPA3 (ORCPT ); Tue, 8 Jan 2019 10:00:29 -0500 Received: by mail-pl1-f193.google.com with SMTP id 101so2014982pld.6 for ; Tue, 08 Jan 2019 07:00:28 -0800 (PST) From: Slavomir Kaslev To: linux-trace-devel@vger.kernel.org Cc: rostedt@goodmis.org, ykaradzhov@vmware.com, tstoyanov@vmware.com Subject: [PATCH v2 3/6] trace-cmd: Add tracecmd_create_recorder_virt function Date: Tue, 8 Jan 2019 17:00:12 +0200 Message-Id: <20190108150015.21327-4-kaslevs@vmware.com> In-Reply-To: <20190108150015.21327-1-kaslevs@vmware.com> References: <20190108150015.21327-1-kaslevs@vmware.com> MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org List-ID: Content-Length: 3865 Add tracecmd_create_recorder_virt function that will be used for tracing VM guests. Signed-off-by: Slavomir Kaslev --- include/trace-cmd/trace-cmd.h | 1 + lib/trace-cmd/trace-recorder.c | 53 ++++++++++++++++++++++++---------- 2 files changed, 39 insertions(+), 15 deletions(-) diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index 26c1180..9ae17cf 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -277,6 +277,7 @@ enum { void tracecmd_free_recorder(struct tracecmd_recorder *recorder); struct tracecmd_recorder *tracecmd_create_recorder(const char *file, int cpu, unsigned flags); struct tracecmd_recorder *tracecmd_create_recorder_fd(int fd, int cpu, unsigned flags); +struct tracecmd_recorder *tracecmd_create_recorder_virt(const char *file, int cpu, int trace_fd); struct tracecmd_recorder *tracecmd_create_recorder_maxkb(const char *file, int cpu, unsigned flags, int maxkb); struct tracecmd_recorder *tracecmd_create_buffer_recorder_fd(int fd, int cpu, unsigned flags, const char *buffer); struct tracecmd_recorder *tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, const char *buffer); diff --git a/lib/trace-cmd/trace-recorder.c b/lib/trace-cmd/trace-recorder.c index 5331925..497f752 100644 --- a/lib/trace-cmd/trace-recorder.c +++ b/lib/trace-cmd/trace-recorder.c @@ -148,16 +148,22 @@ tracecmd_create_buffer_recorder_fd2(int fd, int fd2, int cpu, unsigned flags, recorder->fd1 = fd; recorder->fd2 = fd2; - if (flags & TRACECMD_RECORD_SNAPSHOT) - ret = asprintf(&path, "%s/per_cpu/cpu%d/snapshot_raw", buffer, cpu); - else - ret = asprintf(&path, "%s/per_cpu/cpu%d/trace_pipe_raw", buffer, cpu); - if (ret < 0) - goto out_free; + if (buffer) { + if (flags & TRACECMD_RECORD_SNAPSHOT) + ret = asprintf(&path, "%s/per_cpu/cpu%d/snapshot_raw", + buffer, cpu); + else + ret = asprintf(&path, "%s/per_cpu/cpu%d/trace_pipe_raw", + buffer, cpu); + if (ret < 0) + goto out_free; + + recorder->trace_fd = open(path, O_RDONLY); + free(path); - recorder->trace_fd = open(path, O_RDONLY); - if (recorder->trace_fd < 0) - goto out_free; + if (recorder->trace_fd < 0) + goto out_free; + } if ((recorder->flags & TRACECMD_RECORD_NOSPLICE) == 0) { ret = pipe(recorder->brass); @@ -177,13 +183,9 @@ tracecmd_create_buffer_recorder_fd2(int fd, int fd2, int cpu, unsigned flags, recorder->pipe_size = pipe_size; } - free(path); - return recorder; out_free: - free(path); - tracecmd_free_recorder(recorder); return NULL; } @@ -194,8 +196,9 @@ tracecmd_create_buffer_recorder_fd(int fd, int cpu, unsigned flags, const char * return tracecmd_create_buffer_recorder_fd2(fd, -1, cpu, flags, buffer, 0); } -struct tracecmd_recorder * -tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, const char *buffer) +static struct tracecmd_recorder * +__tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, + const char *buffer) { struct tracecmd_recorder *recorder; int fd; @@ -258,6 +261,26 @@ tracecmd_create_buffer_recorder_maxkb(const char *file, int cpu, unsigned flags, goto out; } +struct tracecmd_recorder * +tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, + const char *buffer) +{ + return __tracecmd_create_buffer_recorder(file, cpu, flags, buffer); +} + +struct tracecmd_recorder * +tracecmd_create_recorder_virt(const char *file, int cpu, int trace_fd) +{ + struct tracecmd_recorder *recorder; + + recorder = __tracecmd_create_buffer_recorder( + file, cpu, TRACECMD_RECORD_NOSPLICE, NULL); + if (recorder) + recorder->trace_fd = trace_fd; + + return recorder; +} + struct tracecmd_recorder *tracecmd_create_recorder_fd(int fd, int cpu, unsigned flags) { const char *tracing;