From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v22 02/13] trace-cmd: Implement new API tracecmd_add_option_v()
Date: Wed, 4 Mar 2020 11:12:09 +0200 [thread overview]
Message-ID: <20200304091220.30936-3-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20200304091220.30936-1-tz.stoyanov@gmail.com>
From: Tzvetomir Stoyanov <tstoyanov@vmware.com>
A new tracecmd API tracecmd_add_option_v() is introduced.
It adds new option in trace.dat, similar to tracecmd_add_option(),
but the option's data is passed as list of buffers. The standard
struct iovec is used as input parameter, containing the option's
data buffers.
Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
---
include/trace-cmd/trace-cmd.h | 5 ++
include/traceevent/event-parse.h | 1 +
lib/trace-cmd/trace-output.c | 117 +++++++++++++++++++++++++++----
3 files changed, 108 insertions(+), 15 deletions(-)
diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h
index d1b4a60f..b6393a89 100644
--- a/include/trace-cmd/trace-cmd.h
+++ b/include/trace-cmd/trace-cmd.h
@@ -278,11 +278,16 @@ struct tracecmd_output *tracecmd_create_init_file_override(const char *output_fi
struct tracecmd_option *tracecmd_add_option(struct tracecmd_output *handle,
unsigned short id, int size,
const void *data);
+struct tracecmd_option *
+tracecmd_add_option_v(struct tracecmd_output *handle,
+ unsigned short id, const struct iovec *vector, int count);
+
struct tracecmd_option *tracecmd_add_buffer_option(struct tracecmd_output *handle,
const char *name, int cpus);
int tracecmd_write_cpus(struct tracecmd_output *handle, int cpus);
int tracecmd_write_options(struct tracecmd_output *handle);
+int tracecmd_append_options(struct tracecmd_output *handle);
int tracecmd_update_option(struct tracecmd_output *handle,
struct tracecmd_option *option, int size,
const void *data);
diff --git a/include/traceevent/event-parse.h b/include/traceevent/event-parse.h
index 52bafa54..cfab6005 100644
--- a/include/traceevent/event-parse.h
+++ b/include/traceevent/event-parse.h
@@ -11,6 +11,7 @@
#include <stdio.h>
#include <regex.h>
#include <string.h>
+#include <sys/uio.h>
#include "traceevent/trace-seq.h"
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index a3dda270..acdd2d57 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -951,21 +951,27 @@ static struct tracecmd_output *create_file(const char *output_file,
}
/**
- * tracecmd_add_option - add options to the file
+ * tracecmd_add_option_v - add options to the file
* @handle: the output file handle name
* @id: the id of the option
* @size: the size of the option data
- * @data: the data to write to the file.
+ * @data: the data to write to the file
+ * @vector: array of vectors, pointing to the data to write in the file
+ * @count: number of items in the vector array
+ *
*
* Returns handle to update option if needed.
* Just the content can be updated, with smaller or equal to
* content than the specified size.
*/
struct tracecmd_option *
-tracecmd_add_option(struct tracecmd_output *handle,
- unsigned short id, int size, const void *data)
+tracecmd_add_option_v(struct tracecmd_output *handle,
+ unsigned short id, const struct iovec *vector, int count)
+
{
struct tracecmd_option *option;
+ char *data = NULL;
+ int i, size = 0;
/*
* We can only add options before they were written.
@@ -974,32 +980,63 @@ tracecmd_add_option(struct tracecmd_output *handle,
if (handle->options_written)
return NULL;
- handle->nr_options++;
+ for (i = 0; i < count; i++)
+ size += vector[i].iov_len;
+ /* Some IDs (like TRACECMD_OPTION_TRACECLOCK) pass vector with 0 / NULL data */
+ if (size) {
+ data = malloc(size);
+ if (!data) {
+ warning("Insufficient memory");
+ return NULL;
+ }
+ }
option = malloc(sizeof(*option));
if (!option) {
warning("Could not allocate space for option");
+ free(data);
return NULL;
}
- option->id = id;
- option->size = size;
- option->data = malloc(size);
- if (!option->data) {
- warning("Insufficient memory");
- free(option);
- return NULL;
+ handle->nr_options++;
+ option->data = data;
+ for (i = 0; i < count; i++) {
+ if (vector[i].iov_base && vector[i].iov_len) {
+ memcpy(data, vector[i].iov_base, vector[i].iov_len);
+ data += vector[i].iov_len;
+ }
}
- /* Some IDs (like TRACECMD_OPTION_TRACECLOCK) pass 0 / NULL data */
- if (size)
- memcpy(option->data, data, size);
+ option->size = size;
+ option->id = id;
list_add_tail(&option->list, &handle->options);
return option;
}
+/**
+ * tracecmd_add_option - add options to the file
+ * @handle: the output file handle name
+ * @id: the id of the option
+ * @size: the size of the option data
+ * @data: the data to write to the file
+ *
+ * Returns handle to update option if needed
+ * Just the content can be updated, with smaller or equal to
+ * content than the specified size
+ */
+struct tracecmd_option *
+tracecmd_add_option(struct tracecmd_output *handle,
+ unsigned short id, int size, const void *data)
+{
+ struct iovec vect;
+
+ vect.iov_base = (void *) data;
+ vect.iov_len = size;
+ return tracecmd_add_option_v(handle, id, &vect, 1);
+}
+
int tracecmd_write_cpus(struct tracecmd_output *handle, int cpus)
{
cpus = convert_endian_4(handle, cpus);
@@ -1047,6 +1084,56 @@ int tracecmd_write_options(struct tracecmd_output *handle)
return 0;
}
+int tracecmd_append_options(struct tracecmd_output *handle)
+{
+ struct tracecmd_option *options;
+ unsigned short option;
+ unsigned short endian2;
+ unsigned int endian4;
+ off_t offset;
+ int r;
+
+ /* If already written, ignore */
+ if (handle->options_written)
+ return 0;
+
+ if (lseek64(handle->fd, 0, SEEK_END) == (off_t)-1)
+ return -1;
+ offset = lseek64(handle->fd, -2, SEEK_CUR);
+ if (offset == (off_t)-1)
+ return -1;
+
+ r = pread(handle->fd, &option, 2, offset);
+ if (r != 2 || option != TRACECMD_OPTION_DONE)
+ return -1;
+
+ list_for_each_entry(options, &handle->options, list) {
+ endian2 = convert_endian_2(handle, options->id);
+ if (do_write_check(handle, &endian2, 2))
+ return -1;
+
+ endian4 = convert_endian_4(handle, options->size);
+ if (do_write_check(handle, &endian4, 4))
+ return -1;
+
+ /* Save the data location in case it needs to be updated */
+ options->offset = lseek64(handle->fd, 0, SEEK_CUR);
+
+ if (do_write_check(handle, options->data,
+ options->size))
+ return -1;
+ }
+
+ option = TRACECMD_OPTION_DONE;
+
+ if (do_write_check(handle, &option, 2))
+ return -1;
+
+ handle->options_written = 1;
+
+ return 0;
+}
+
int tracecmd_update_option(struct tracecmd_output *handle,
struct tracecmd_option *option, int size,
const void *data)
--
2.24.1
next prev parent reply other threads:[~2020-03-04 9:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 9:12 [PATCH v22 00/13] Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 01/13] trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM Tzvetomir Stoyanov (VMware)
2020-03-04 21:09 ` Steven Rostedt
2020-03-04 9:12 ` Tzvetomir Stoyanov (VMware) [this message]
2020-03-04 9:12 ` [PATCH v22 03/13] trace-cmd: Add new API to generate a unique ID of the tracing session Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 04/13] trace-cmd: Store the session tracing ID in the trace.dat file Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 05/13] trace-cmd: Add definitions of htonll() and ntohll() Tzvetomir Stoyanov (VMware)
2020-03-05 15:48 ` [PATCH] trace-cmd: Make functions in trace-write-local.h inline Steven Rostedt
2020-03-04 9:12 ` [PATCH v22 06/13] trace-cmd: Exchange tracing IDs between host and guest Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 07/13] trace-cmd: Implement new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT Tzvetomir Stoyanov (VMware)
2020-03-05 17:46 ` [PATCH] trace-cmd: Adjust host_trace_info structure to be better packed Steven Rostedt
2020-03-04 9:12 ` [PATCH v22 08/13] trace-cmd: Add guest information in host's trace.dat file Tzvetomir Stoyanov (VMware)
2020-03-05 18:44 ` [PATCH] trace-cmd: Make name and cpu_pid into const pointers to tracecmd_get_guest_cpumap() Steven Rostedt
2020-03-04 9:12 ` [PATCH v22 09/13] trace-cmd: Add host trace clock as guest trace argument Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 10/13] trace-cmd: Refactor few trace-cmd internal functions Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 11/13] trace-cmd: Basic infrastructure for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 12/13] trace-cmd: [POC] PTP-like algorithm " Tzvetomir Stoyanov (VMware)
2020-03-04 9:12 ` [PATCH v22 13/13] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)
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