New API can be used to configure compression algorithm on a output
handler to a trace file.
tracecmd_output_set_compression()
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
.../include/private/trace-cmd-private.h | 1 +
lib/trace-cmd/trace-output.c | 47 +++++++++++++++++++
2 files changed, 48 insertions(+)
diff --git a/lib/trace-cmd/include/private/trace-cmd-private.h b/lib/trace-cmd/include/private/trace-cmd-private.h
index 455ff680..ee224903 100644
--- a/lib/trace-cmd/include/private/trace-cmd-private.h
+++ b/lib/trace-cmd/include/private/trace-cmd-private.h
@@ -281,6 +281,7 @@ int tracecmd_output_set_trace_dir(struct tracecmd_output *handler, const char *t
int tracecmd_output_set_kallsyms(struct tracecmd_output *handler, const char *kallsyms);
int tracecmd_output_set_from_input(struct tracecmd_output *handler, struct tracecmd_input *ihandle);
int tracecmd_output_set_version(struct tracecmd_output *handler, int file_version);
+int tracecmd_output_set_compression(struct tracecmd_output *handler, const char *compression);
int tracecmd_output_write_init(struct tracecmd_output *handler);
int tracecmd_output_write_headers(struct tracecmd_output *handler,
struct tracecmd_event_list *list);
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index 42b193dc..23a10edc 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -219,6 +219,7 @@ void tracecmd_output_free(struct tracecmd_output *handle)
free(option);
}
free(handle->trace_clock);
+ tracecmd_compress_destroy(handle->compress);
free(handle);
}
@@ -1127,6 +1128,52 @@ int tracecmd_output_set_version(struct tracecmd_output *handler, int file_versio
return 0;
}
+/**
+ * tracecmd_output_set_compression - Set file compression algorithm of the output handler
+ * @handle: output handler to a trace file.
+ * @compression: name of the desired compression algorithm. Can be one of:
+ * - "none" - do not use compression
+ * - "all" - use the best available compression algorithm
+ * - or specific name of the desired compression algorithm
+ *
+ * This API must be called before tracecmd_output_write_init().
+ *
+ * Returns 0 on success, or -1 in case of an error:
+ * - the output file handler is not allocated or not in expected state.
+ * - the specified compression algorithm is not available
+ */
+int tracecmd_output_set_compression(struct tracecmd_output *handler, const char *compression)
+{
+ if (!handler || handler->file_state != TRACECMD_FILE_ALLOCATED)
+ return -1;
+
+ handler->compress = NULL;
+ if (compression && strcmp(compression, "none")) {
+ if (!strcmp(compression, "any")) {
+ handler->compress = tracecmd_compress_alloc(NULL, NULL, handler->fd,
+ handler->pevent,
+ handler->msg_handle);
+ if (!handler->compress)
+ tracecmd_warning("No compression algorithms are supported");
+ } else {
+ handler->compress = tracecmd_compress_alloc(compression, NULL, handler->fd,
+ handler->pevent,
+ handler->msg_handle);
+ if (!handler->compress) {
+ tracecmd_warning("Compression algorithm %s is not supported",
+ compression);
+ return -1;
+ }
+ }
+ }
+ if (handler->compress && handler->file_version < 7) {
+ handler->file_version = 7;
+ if (handler->msg_handle)
+ tracecmd_msg_handle_cache(handler->msg_handle);
+ }
+
+ return 0;
+}
/**
* tracecmd_output_write_init - Write the initial magics in the trace file
--
2.31.1
|