The patch titled
Add better resolution to initcall_debug timings
has been added to the -mm tree. Its filename is
add-better-resolution-to-initcall_debug-timings.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: Add better resolution to initcall_debug timings
From: Tim Bird <tim.bird@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN init/main.c~add-better-resolution-to-initcall_debug-timings init/main.c
--- a/init/main.c~add-better-resolution-to-initcall_debug-timings
+++ a/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;
_
Patches currently in -mm which might be from tim.bird@xxxxxxxxxxx are
linux-next.patch
add-better-resolution-to-initcall_debug-timings.patch
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