From: "Slavomir Kaslev (VMware)" <slavomir.kaslev@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v12 03/13] trace-cmd: Add tracecmd_create_recorder_virt() function
Date: Tue, 18 Jun 2019 17:44:45 +0300 [thread overview]
Message-ID: <20190618144455.3954-4-slavomir.kaslev@gmail.com> (raw)
In-Reply-To: <20190618144455.3954-1-slavomir.kaslev@gmail.com>
From: Slavomir Kaslev <kaslevs@vmware.com>
Add tracecmd_create_recorder_virt() which creates tracecmd_recorder recording
tracing data from the trace_fd parameter instead of from the local systems
tracefs. It will be used for recording tracing data coming from VMs.
Signed-off-by: Slavomir Kaslev <kaslevs@vmware.com>
---
include/trace-cmd/trace-cmd.h | 1 +
lib/trace-cmd/trace-recorder.c | 61 +++++++++++++++++++++++++---------
2 files changed, 47 insertions(+), 15 deletions(-)
diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h
index 923015e..28b5b38 100644
--- a/include/trace-cmd/trace-cmd.h
+++ b/include/trace-cmd/trace-cmd.h
@@ -281,6 +281,7 @@ 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, unsigned flags, 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 0bd0657..0ea7a87 100644
--- a/lib/trace-cmd/trace-recorder.c
+++ b/lib/trace-cmd/trace-recorder.c
@@ -154,16 +154,22 @@ 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);
@@ -183,13 +189,9 @@ 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;
}
@@ -200,8 +202,9 @@ 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;
@@ -264,6 +267,34 @@ 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);
+}
+
+/**
+ * tracecmd_create_recorder_virt - Create a recorder reading tracing data
+ * from the trace_fd file descriptor instead of from the local tracefs
+ * @file: output filename where tracing data will be written
+ * @cpu: which CPU is being traced
+ * @flags: flags configuring the recorder (see TRACECMD_RECORDER_* enums)
+ * @trace_fd: file descriptor from where tracing data will be read
+ */
+struct tracecmd_recorder *
+tracecmd_create_recorder_virt(const char *file, int cpu, unsigned flags,
+ int trace_fd)
+{
+ struct tracecmd_recorder *recorder;
+
+ recorder = __tracecmd_create_buffer_recorder(file, cpu, flags, 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;
--
2.20.1
next prev parent reply other threads:[~2019-06-18 14:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 14:44 [PATCH v12 00/13] Add VM kernel tracing over vsockets and FIFOs Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 01/13] trace-cmd: Make ports unsigned int Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 02/13] trace-cmd: Detect if vsockets are available Slavomir Kaslev (VMware)
2019-06-18 14:44 ` Slavomir Kaslev (VMware) [this message]
2019-06-18 14:44 ` [PATCH v12 04/13] trace-cmd: Add VM tracing protocol messages Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 05/13] trace-cmd: Add buffer instance flags for tracing in guest and agent context Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 06/13] trace-cmd: Add VM kernel tracing over vsockets transport Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 07/13] trace-cmd: Use splice(2) for vsockets if available Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 08/13] trace-cmd: Switch stop recording signal to SIGUSR1 Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 09/13] trace-cmd: Add `trace-cmd setup-guest` command Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 10/13] trace-cmd: Try to autodetect number of guest CPUs in setup-guest if not specified Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 11/13] trace-cmd: Add setup-guest flag for attaching FIFOs to the guest VM config Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 12/13] trace-cmd: Add splice() recording from FIFO without additional pipe buffer Slavomir Kaslev (VMware)
2019-06-18 14:44 ` [PATCH v12 13/13] trace-cmd: Add support for tracing VMware Workstation VMs by name Slavomir Kaslev (VMware)
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