src-test2/lib/libdevstat/devstat.c, branch release/5.3.0

Remove the use of cast as lvalue. GCC 3.4 isses a deprecation warning

2004-06-25T01:16:02Z

for this now.

Include for nlist-related declarations instead of depending on

2003-10-13T05:30:20Z

namespace pollution in .

It is not an error to have no devices.

2003-08-17T12:06:44Z

Add prototype for compute_stats() so that libdevstat is WARNS=4 clean.

2003-04-19T07:42:13Z

Spotted by: kris

If rounding results in -epsilon device busy %, set it to zero.

2003-04-09T07:49:15Z

typo

2003-03-19T14:15:32Z

Further unbreak devstat: sort the index array in correct order too.

2003-03-19T14:11:14Z

Add more devstat calculations, mostly filling in holes, but also adding

2003-03-18T09:57:54Z

a couple of reqests: DSM_BUSY_PCT and DSM_QUEUE_LENGTH. I have no further plans for mutilating this API at this point in time, and will update the man-page to reflect current reality as the next thing. Reviewed by: ken

And I managed to make a regression here too.

2003-03-15T22:22:11Z

I have too many source trees :-(

Run a revision of the devstat interface:

2003-03-15T21:59:06Z

Kernel: Change statistics to use the *uptime() timescale (ie: relative to boottime) rather than the UTC aligned timescale. This makes the device statistics code oblivious to clock steps. Change timestamps to bintime format, they are cheaper. Remove the "busy_count", and replace it with two counter fields: "start_count" and "end_count", which are updated in the down and up paths respectively. This removes the locking constraint on devstat. Add a timestamp argument to devstat_start_transaction(), this will normally be a timestamp set by the *_bio() function in bp->bio_t0. Use this field to calculate duration of I/O operations. Add two timestamp arguments to devstat_end_transaction(), one is the current time, a NULL pointer means "take timestamp yourself", the other is the timestamp of when this transaction started (see above). Change calculation of busy_time to operate on "the salami principle": Only when we are idle, which we can determine by the start+end counts being identical, do we update the "busy_from" field in the down path. In the up path we accumulate the timeslice in busy_time and update busy_from. Change the byte_* and num_* fields into two arrays: bytes[] and operations[]. Userland: Change the misleading "busy_time" name to be called "snap_time" and make the time long double since that is what most users need anyway, fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same timescale as the kernel fields. Change devstat_compute_etime() to operate on struct bintime. Remove the version 2 legacy interface: the change to bintime makes compatibility far too expensive. Fix a bug in systat's "vm" page where boot relative busy times would be bogus. Bump __FreeBSD_version to 500107 Review & Collaboration by: ken