On Wed, 2007-05-30 at 12:39 -0700, Matthew Helsley wrote: > On Wed, 2007-05-30 at 14:49 +0200, Peter Zijlstra wrote: > > plain text document attachment (lockstat-output.patch) > > Present all this fancy new lock statistics information: > > > > *warning, _wide_ output ahead* > > > > (output edited for purpose of brevity) > > > > # cat /proc/lock_stat > > lock_stat version 0.1 > > ----------------------------------------------------------------------------------------------------------------------------------------------------------------- > > class name contentions waittime-min > > waittime-max waittime-total acquisitions holdtime-min holdtime-max > > holdtime-total > > ----------------------------------------------------------------------------------------------------------------------------------------------------------------- > > <snip> > > > 'contentions' and 'acquisitions' are the number of such events measured > > (since > > the last reset). The waittime- and holdtime- (min, max, total) numbers are > > presented in microseconds. > > I think it would make sense to actually mention the time scale in the > output header someplace. Then a tool written to analyze this file will > have a way of determining the time scale without using error-prone > heuristics (like "kernel version foo uses microseconds while kernel foo > + 100 uses nanoseconds").
I did think of putting [us] after each time related column description, but that would widen the output even more (not sure it matters that much, its very wide already anyway). However, the current format is microseconds with 2 decimals, so that is basically a 10 nanosecond granularity. I do not think the extra digit is worth much hassle (and it could be added as a 3rd decimal digit without breaking the current format). Also, there is a version string at the top, which should be changed every time the output format changes. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
