[PATCH v4 15/29] trace-cmd record: Add new parameter --compression

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Added a new parameter "trace-cmd record --compression", can be used to
select the desired compression algorithm for the trace output file.
One of these strings can be passed:
 "any" - auto select the best available compression algorithm
 "none" - do not compress the trace file
 name - the name of the desired compression algorithms, available
        algorithms can be listed with "trace-cmd list -c"

If a compression is used, trace file version 7 is selected, otherwise
trace file version 6 is used.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-record.c | 24 +++++++++++++++++++-----
 tracecmd/trace-usage.c  |  5 +++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 03d82377..b71c9608 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -199,6 +199,7 @@ struct common_record_context {
 	char *date2ts;
 	char *user;
 	const char *clock;
+	const char *compression;
 	struct tsc_nsec tsc2nsec;
 	int data_flags;
 	int tsync_loop_interval;
@@ -3700,7 +3701,8 @@ setup_connection(struct buffer_instance *instance, struct common_record_context
 
 	/* Now create the handle through this socket */
 	if (msg_handle->version == V3_PROTOCOL) {
-		network_handle = tracecmd_create_init_fd_msg(msg_handle, listed_events, NULL);
+		network_handle = tracecmd_create_init_fd_msg(msg_handle,
+							     listed_events, ctx->compression);
 		if (!network_handle)
 			goto error;
 		tracecmd_set_quiet(network_handle, quiet);
@@ -3718,7 +3720,8 @@ setup_connection(struct buffer_instance *instance, struct common_record_context
 		if (ret)
 			goto error;
 	} else {
-		network_handle = tracecmd_create_init_fd_glob(msg_handle->fd, listed_events, NULL);
+		network_handle = tracecmd_create_init_fd_glob(msg_handle->fd,
+							      listed_events, ctx->compression);
 		if (!network_handle)
 			goto error;
 		tracecmd_set_quiet(network_handle, quiet);
@@ -4066,7 +4069,8 @@ static void setup_agent(struct buffer_instance *instance,
 {
 	struct tracecmd_output *network_handle;
 
-	network_handle = tracecmd_create_init_fd_msg(instance->msg_handle, listed_events, NULL);
+	network_handle = tracecmd_create_init_fd_msg(instance->msg_handle,
+						     listed_events, ctx->compression);
 	add_options(network_handle, ctx);
 	tracecmd_write_cmdlines(network_handle);
 	tracecmd_write_cpus(network_handle, instance->cpu_count);
@@ -4458,7 +4462,8 @@ static void record_data(struct common_record_context *ctx)
 		return;
 
 	if (latency) {
-		handle = tracecmd_create_file_latency(ctx->output, local_cpu_count, NULL);
+		handle = tracecmd_create_file_latency(ctx->output,
+						      local_cpu_count, ctx->compression);
 		tracecmd_set_quiet(handle, quiet);
 	} else {
 		if (!local_cpu_count)
@@ -4489,7 +4494,8 @@ static void record_data(struct common_record_context *ctx)
 				touch_file(temp_files[i]);
 		}
 
-		handle = tracecmd_create_init_file_glob(ctx->output, listed_events, NULL);
+		handle = tracecmd_create_init_file_glob(ctx->output,
+							listed_events, ctx->compression);
 		if (!handle)
 			die("Error creating output file");
 		tracecmd_set_quiet(handle, quiet);
@@ -5736,6 +5742,7 @@ void init_top_instance(void)
 }
 
 enum {
+	OPT_comporession	= 239,
 	OPT_tsc2nsec		= 240,
 	OPT_fork		= 241,
 	OPT_tsyncinterval	= 242,
@@ -6170,6 +6177,7 @@ static void parse_record_options(int argc,
 			{"tsync-interval", required_argument, NULL, OPT_tsyncinterval},
 			{"fork", no_argument, NULL, OPT_fork},
 			{"tsc2nsec", no_argument, NULL, OPT_tsc2nsec},
+			{"compression", required_argument, NULL, OPT_comporession},
 			{NULL, 0, NULL, 0}
 		};
 
@@ -6591,6 +6599,12 @@ static void parse_record_options(int argc,
 				die("TSC to nanosecond is not supported");
 			ctx->instance->flags |= BUFFER_FL_TSC2NSEC;
 			break;
+		case OPT_comporession:
+			if (strcmp(optarg, "any") && strcmp(optarg, "none") &&
+			    !tracecmd_compress_is_supported(optarg, NULL))
+				die("Compression algorithm  %s is not supported", optarg);
+			ctx->compression = strdup(optarg);
+			break;
 		case OPT_quiet:
 		case 'q':
 			quiet = true;
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index c388eccd..a1d7799a 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -68,6 +68,11 @@ static struct usage_help usage_help[] = {
 		"               If a negative number is specified, timestamps synchronization is disabled"
 		"               If 0 is specified, no loop is performed - timestamps offset is calculated only twice,"
 		"                                                         at the beginnig and at the end of the trace\n"
+		"          --compression compress the trace output file, one of these strings can be passed:\n"
+		"                            any  - auto select the best available compression algorithm\n"
+		"                            none - do not compress the trace file\n"
+		"                            name - the name of the desired compression algorithms\n"
+		"                        available algorithms can be listed with trace-cmd list -c\n"
 	},
 	{
 		"set",
-- 
2.31.1