From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QoVkI-00052F-QE for barebox@lists.infradead.org; Wed, 03 Aug 2011 07:20:04 +0000 From: Sascha Hauer Date: Wed, 3 Aug 2011 09:19:59 +0200 Message-Id: <1312355999-19496-3-git-send-email-s.hauer@pengutronix.de> In-Reply-To: <1312355999-19496-1-git-send-email-s.hauer@pengutronix.de> References: <1312355999-19496-1-git-send-email-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] Add 'time' command to measure execution time of a command To: barebox@lists.infradead.org Signed-off-by: Sascha Hauer --- commands/Kconfig | 10 +++++++++ commands/Makefile | 1 + commands/time.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 68 insertions(+), 0 deletions(-) create mode 100644 commands/time.c diff --git a/commands/Kconfig b/commands/Kconfig index 5700dc2..e922260 100644 --- a/commands/Kconfig +++ b/commands/Kconfig @@ -97,6 +97,16 @@ endchoice endif +config CMD_TIME + bool "time" + help + Just like the unix time command this command allows to measure the + execution time of a command. Note: barebox does not use interrupts, + so the system timer can overrun during the execution of the command + resulting in incorrect results. The timer gets updated in the function + checking for ctrl-c, so the time command can be used with commands + which are interruptible with ctrl-c. + endmenu menu "file commands " diff --git a/commands/Makefile b/commands/Makefile index 8ee4aba..7c88b48 100644 --- a/commands/Makefile +++ b/commands/Makefile @@ -57,3 +57,4 @@ obj-$(CONFIG_CMD_LOGIN) += login.o obj-$(CONFIG_CMD_LED) += led.o obj-$(CONFIG_CMD_LED_TRIGGER) += trigger.o obj-$(CONFIG_CMD_USB) += usb.o +obj-$(CONFIG_CMD_TIME) += time.o 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 +#include +#include +#include +#include + +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 \n") +BAREBOX_CMD_HELP_SHORT("note: This command depends on 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 -- 1.7.5.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox