On Thu, 2005-08-04 at 14:59 +0200, Borislav Petkov wrote:
>
> where you see the deltas between the printk's printed once the tsc timer is
> initialized as opposed to the first bootlog where you see all times relative
> to a single point in time. The python script <scripts/show_delta> in the
> kernel source converts between these two representations but there's a pretty
> simple solution IMHO to make PRINTK_TIME uniform and independent from the
> used timer. The one liner is against 2.6.12.3.
>
> After applying it, printk timing looks like this:
>
> <snip>
> [ 0.000000] Detected 1500.132 MHz processor.
> [ 0.000000] Using pmtmr for high-res timesource
> [ 0.000000] Console: colour VGA+ 80x25
> [ 1.890000] Dentry cache hash table entries: 131072 (order: 7, 524288
> bytes)
> [ 1.891000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> [ 1.906000] Memory: 513756k/523520k available (2839k kernel code, 9276k
> reserved, 1148k data, 152k init, 0k highmem)
> [ 1.906000] Checking if this processor honours the WP bit even in
> supervisor mode... Ok.
> [ 1.906000] Calibrating delay loop... 2973.69 BogoMIPS (lpj=1486848)
> [ 1.928000] Security Framework v1.0.0 initialized
> </snip>
>
But if you are debugging problems with jiffies wrapping, wouldn't you
want to see the jiffies unmodified? I understand your point, but the
tsc output (which I do prefer) seems to only be for the tsc (on x86),
and all else use jiffies (haven't looked at other archs). So debugging a
problem with jiffy wrap*, one would need to use something other than the
tsc, and then they would see the time the wrap occurred.
Also, the big number stands out more than the 3 zeros, so when I see
that, I know right away to go and change it back to use the tsc (since
my debugging usually needs higher resolutions).
* new product from Renolds ;-)
-- Steve
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