Extended the BUFFER trace option in trace file version 7 with CPU
flyrecord trace metadata. In the version 6 of the trace file, this metadata
is located at several places in the file. Part of the metadata is only for
the top trace instance, thus limiting per-instance configuration. Moving
all CPU trace related metadata in the BUFFER option simplifies the parsing
and makes per-instance configuration more flexible. In the new file
structure, the top instance is treated as any other instances.
The format of the extended BUFFER option is:
- offset of the buffer in the trace file
- name of the buffer
- trace clock, used in this buffer for events timestamps
- count of CPUs with trace data
- array, describing each CPU with trace data:
- CPU id
- offset of CPU trace data in the trace file
- size of the recorded CPU trace data
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
lib/trace-cmd/trace-output.c | 171 ++++++++++++++++++++++++++---------
1 file changed, 127 insertions(+), 44 deletions(-)
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index d60bd456..21555d6d 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -1826,7 +1826,7 @@ int tracecmd_append_options(struct tracecmd_output *handle)
}
static struct tracecmd_option *
-add_buffer_option(struct tracecmd_output *handle, const char *name, int cpus)
+add_buffer_option_v6(struct tracecmd_output *handle, const char *name, int cpus)
{
struct tracecmd_option *option;
char *buf;
@@ -1876,8 +1876,11 @@ int tracecmd_write_buffer_info(struct tracecmd_output *handle)
struct tracecmd_option *option;
struct tracecmd_buffer *buf;
+ if (handle->file_version >= 7)
+ return 0;
+
list_for_each_entry(buf, &handle->buffers, list) {
- option = add_buffer_option(handle, buf->name, buf->cpus);
+ option = add_buffer_option_v6(handle, buf->name, buf->cpus);
if (!option)
return -1;
buf->option = option;
@@ -1938,6 +1941,98 @@ int tracecmd_write_cmdlines(struct tracecmd_output *handle)
return 0;
}
+static char *get_clock(struct tracecmd_output *handle)
+{
+ struct tracefs_instance *inst;
+
+ if (handle->trace_clock)
+ return handle->trace_clock;
+
+ /*
+ * If no clock is set on this handle, get the trace clock of
+ * the top instance in the handle's tracing dir
+ */
+ inst = tracefs_instance_alloc(handle->tracing_dir, NULL);
+ if (!inst)
+ return NULL;
+ handle->trace_clock = tracefs_get_clock(inst);
+ tracefs_instance_free(inst);
+ return handle->trace_clock;
+}
+
+__hidden struct tracecmd_option *
+out_add_buffer_option_v7(struct tracecmd_output *handle, const char *name,
+ unsigned short id, unsigned long long data_offset,
+ int cpus, struct data_file_write *cpu_data)
+{
+ struct tracecmd_option *option;
+ int i, j = 0, k = 0;
+ int *cpu_ids = NULL;
+ struct iovec *vect;
+ char *clock;
+
+ if (handle->file_version < 7)
+ return NULL;
+
+ clock = get_clock(handle);
+
+ /* Buffer flyrecord option, v7:
+ * - trace data offset in the file
+ * - buffer name
+ * - buffer clock
+ * - CPU count
+ * - for each CPU:
+ * - CPU id
+ * - CPU trace data offset in the file
+ * - CPU trace data size
+ */
+
+ /* Buffer latency option, v7:
+ * - trace data offset in the file
+ * - buffer name
+ * - buffer clock
+ */
+
+ vect = calloc(5 + (cpus * 3), sizeof(struct iovec));
+ if (!vect)
+ return NULL;
+ if (cpus) {
+ cpu_ids = calloc(cpus, sizeof(int));
+ if (!cpu_ids) {
+ free(vect);
+ return NULL;
+ }
+ }
+ vect[j].iov_base = (void *) &data_offset;
+ vect[j++].iov_len = 8;
+ vect[j].iov_base = (void *) name;
+ vect[j++].iov_len = strlen(name) + 1;
+ vect[j].iov_base = (void *) clock;
+ vect[j++].iov_len = strlen(clock) + 1;
+ if (id == TRACECMD_OPTION_BUFFER) {
+ vect[j].iov_base = (void *) &k;
+ vect[j++].iov_len = 4;
+ for (i = 0; i < cpus; i++) {
+ if (!cpu_data[i].file_size)
+ continue;
+ cpu_ids[i] = i;
+ vect[j].iov_base = &cpu_ids[i];
+ vect[j++].iov_len = 4;
+ vect[j].iov_base = &cpu_data[i].data_offset;
+ vect[j++].iov_len = 8;
+ vect[j].iov_base = &cpu_data[i].write_size;
+ vect[j++].iov_len = 8;
+ k++;
+ }
+ }
+
+ option = tracecmd_add_option_v(handle, id, vect, j);
+ free(vect);
+ free(cpu_ids);
+
+ return option;
+}
+
struct tracecmd_output *tracecmd_create_file_latency(const char *output_file, int cpus,
int file_version)
{
@@ -2017,7 +2112,7 @@ out:
return ret;
}
-static int update_buffer_cpu_offset(struct tracecmd_output *handle,
+static int update_buffer_cpu_offset_v6(struct tracecmd_output *handle,
const char *name, tsize_t offset)
{
tsize_t b_offset;
@@ -2047,27 +2142,6 @@ static int update_buffer_cpu_offset(struct tracecmd_output *handle,
return 0;
}
-
-static char *get_clock(struct tracecmd_output *handle)
-{
- struct tracefs_instance *inst;
-
- if (handle->trace_clock)
- return handle->trace_clock;
-
- /*
- * If no clock is set on this handle, get the trace clock of
- * the top instance in the handle's tracing dir
- */
- inst = tracefs_instance_alloc(handle->tracing_dir, NULL);
- if (!inst)
- return NULL;
- handle->trace_clock = tracefs_get_clock(inst);
- tracefs_instance_free(inst);
- return handle->trace_clock;
-}
-
-
__hidden int out_write_cpu_data(struct tracecmd_output *handle,
int cpus, struct cpu_data_source *data, const char *buff_name)
{
@@ -2091,7 +2165,7 @@ __hidden int out_write_cpu_data(struct tracecmd_output *handle,
}
data_offs = do_lseek(handle, 0, SEEK_CUR);
- if (do_write_check(handle, "flyrecord", 10))
+ if (handle->file_version < 7 && do_write_check(handle, "flyrecord", 10))
goto out_free;
data_files = calloc(cpus, sizeof(struct data_file_write));
@@ -2112,10 +2186,12 @@ __hidden int out_write_cpu_data(struct tracecmd_output *handle,
}
}
- update_buffer_cpu_offset(handle, buff_name, data_offs);
- clock = get_clock(handle);
- if (clock && save_clock(handle, clock))
- goto out_free;
+ if (handle->file_version < 7) {
+ update_buffer_cpu_offset_v6(handle, buff_name, data_offs);
+ clock = get_clock(handle);
+ if (clock && save_clock(handle, clock))
+ goto out_free;
+ }
for (i = 0; i < cpus; i++) {
data_files[i].data_offset = do_lseek(handle, 0, SEEK_CUR);
@@ -2142,26 +2218,33 @@ __hidden int out_write_cpu_data(struct tracecmd_output *handle,
data_files[i].write_size = 0;
}
- /* Write the real CPU data offset in the file */
- if (do_lseek(handle, data_files[i].doffset, SEEK_SET) == (off64_t)-1)
- goto out_free;
- endian8 = convert_endian_8(handle, data_files[i].data_offset);
- if (do_write_check(handle, &endian8, 8))
- goto out_free;
- /* Write the real CPU data size in the file */
- if (do_lseek(handle, data_files[i].soffset, SEEK_SET) == (off64_t)-1)
- goto out_free;
- endian8 = convert_endian_8(handle, data_files[i].write_size);
- if (do_write_check(handle, &endian8, 8))
- goto out_free;
- offset = data_files[i].data_offset + data_files[i].write_size;
- if (do_lseek(handle, offset, SEEK_SET) == (off64_t)-1)
- goto out_free;
+ if (handle->file_version < 7) {
+ /* Write the real CPU data offset in the file */
+ if (do_lseek(handle, data_files[i].doffset, SEEK_SET) == (off64_t)-1)
+ goto out_free;
+ endian8 = convert_endian_8(handle, data_files[i].data_offset);
+ if (do_write_check(handle, &endian8, 8))
+ goto out_free;
+ /* Write the real CPU data size in the file */
+ if (do_lseek(handle, data_files[i].soffset, SEEK_SET) == (off64_t)-1)
+ goto out_free;
+ endian8 = convert_endian_8(handle, data_files[i].write_size);
+ if (do_write_check(handle, &endian8, 8))
+ goto out_free;
+ offset = data_files[i].data_offset + data_files[i].write_size;
+ if (do_lseek(handle, offset, SEEK_SET) == (off64_t)-1)
+ goto out_free;
+ }
if (!tracecmd_get_quiet(handle))
fprintf(stderr, " %llu bytes in size\n",
(unsigned long long)data_files[i].write_size);
}
+ if (handle->file_version >= 7 &&
+ !out_add_buffer_option_v7(handle, buff_name,
+ TRACECMD_OPTION_BUFFER, data_offs, cpus, data_files))
+ goto out_free;
+
if (do_lseek(handle, 0, SEEK_END) == (off64_t)-1)
goto out_free;
--
2.31.1
|