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authorSascha Hauer <s.hauer@pengutronix.de>2011-03-16 21:32:05 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2011-08-03 09:16:29 +0200
commit5de95712d99eff5c628b19681b12a88dd20ec021 (patch)
tree9ff3127bb886623c7bf2d319294660bb6736dee7 /commands/time.c
parent39825b591ceb7beaaed8a1c424235db48d79e4d1 (diff)
downloadbarebox-5de95712d99eff5c628b19681b12a88dd20ec021.tar.gz
Add 'time' command to measure execution time of a command
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/time.c')
-rw-r--r--commands/time.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/commands/time.c b/commands/time.c
new file mode 100644
index 0000000..9a76945
--- /dev/null
+++ b/commands/time.c
@@ -0,0 +1,57 @@
+#include <common.h>
+#include <command.h>
+#include <clock.h>
+#include <asm-generic/div64.h>
+#include <malloc.h>
+
+static int do_time(struct command *cmdtp, int argc, char *argv[])
+{
+ int i;
+ unsigned char *buf;
+ u64 start, end, diff64;
+ unsigned long diff;
+ int len = 0;
+
+ if (argc < 2)
+ return COMMAND_ERROR_USAGE;
+
+ for (i = 1; i < argc; i++)
+ len += strlen(argv[i]) + 1;
+
+ buf = xzalloc(len);
+
+ for (i = 1; i < argc; i++) {
+ strcat(buf, argv[i]);
+ strcat(buf, " ");
+ }
+
+ start = get_time_ns();
+
+ run_command(buf, 0);
+
+ end = get_time_ns();
+
+ diff64 = end - start;
+
+ do_div(diff64, 1000000);
+
+ diff = diff64;
+
+ printf("time: %ldms\n", diff);
+
+ free(buf);
+
+ return 0;
+}
+
+BAREBOX_CMD_HELP_START(time)
+BAREBOX_CMD_HELP_USAGE("time <command>\n")
+BAREBOX_CMD_HELP_SHORT("note: This command depends on <command> being interruptible,\n")
+BAREBOX_CMD_HELP_SHORT("Otherwise the timer may overrun resulting in incorrect results\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(time)
+ .cmd = do_time,
+ .usage = "measure execution time of a command",
+ BAREBOX_CMD_HELP(cmd_time_help)
+BAREBOX_CMD_END