diff options
| author | Tim Bird <tim.bird@am.sony.com> | 2008-10-09 15:23:05 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:39:27 +0200 |
| commit | ca538f6bbe583406f941f3041d40c41f9a13d1de (patch) | |
| tree | 460e3cf96472e327b48befbb4836c2d40e46f937 /init | |
| parent | ad0a3b68114e8f3c25ac0045b45a2838f23e3b3a (diff) | |
| download | lwn-ca538f6bbe583406f941f3041d40c41f9a13d1de.tar.gz lwn-ca538f6bbe583406f941f3041d40c41f9a13d1de.zip | |
tracing/fastboot: add better resolution to initcall debug/tracing
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 <tim.bird@am.sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/init/main.c b/init/main.c index e7939de80f3e..b2e7ff4a5349 100644 --- a/init/main.c +++ b/init/main.c @@ -721,8 +721,8 @@ int do_one_initcall(initcall_t fn) if (initcall_debug) { it.rettime = ktime_get(); delta = ktime_sub(it.rettime, it.calltime); - it.duration = (unsigned long long) delta.tv64 >> 20; - printk("initcall %pF returned %d after %Ld msecs\n", fn, + it.duration = (unsigned long long) delta.tv64 >> 10; + printk("initcall %pF returned %d after %Ld usecs\n", fn, it.result, it.duration); trace_boot(&it, fn); } |