From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Bird Subject: [PATCH] Add better resolution to initcall_debug timings Date: Fri, 12 Sep 2008 12:51:45 -0700 Message-ID: <48CAC851.4020408@am.sony.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-embedded Cc: linux kernel Change the time resolution for initcall_debug to microseconds, from milliseconds. This is handy to determine which initcalls you want to work on for faster booting. One one of my test machines, over 90% of the initcalls are less than a millisecond and (without this patch) these are all reported as 0 msecs. Working on the 900 us ones is more important than the 4 us ones. With 'quiet' on the kernel command line, this adds no significant overhead to kernel boot time. Signed-off-by: Tim Bird --- init/main.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/init/main.c b/init/main.c index bdc8be0..f441cad 100644 --- a/init/main.c +++ b/init/main.c @@ -719,8 +719,8 @@ int do_one_initcall(initcall_t fn) delta = ktime_sub(t1, t0); print_fn_descriptor_symbol("initcall %s", fn); - printk(" returned %d after %Ld msecs\n", result, - (unsigned long long) delta.tv64 >> 20); + printk(" returned %d after %Ld usecs\n", result, + (unsigned long long) delta.tv64 >> 10); } msgbuf[0] = 0; -- 1.5.6