7194d335cf
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 |
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| .. | ||
| atrun | ||
| bootpd | ||
| comsat | ||
| fingerd | ||
| ftpd | ||
| getNAME | ||
| getty | ||
| lukemftpd | ||
| mail.local | ||
| makekey | ||
| mknetid | ||
| named-xfer | ||
| pppoed | ||
| pt_chown | ||
| rbootd | ||
| revnetgroup | ||
| rexecd | ||
| rlogind | ||
| rpc.rquotad | ||
| rpc.rstatd | ||
| rpc.rusersd | ||
| rpc.rwalld | ||
| rpc.sprayd | ||
| rshd | ||
| rtld-aout | ||
| rtld-elf | ||
| save-entropy | ||
| smrsh | ||
| talkd | ||
| tcpd | ||
| telnetd | ||
| tftpd | ||
| xtend | ||
| ypxfr | ||
| Makefile | ||
| Makefile.inc | ||