of average duration, and total busy time instead of %.
This looks more useful when one runs `iostat -Ix` periodically to
collect statistics: e.g. now it is possible to calculate busy %
between two runs subtracting total busy times and dividing per time
period.
Average duration and % busy are still available via `iostat -x`.
- The default repeat count for iostat(8) is 1 unless there
was a -w on the command line.
- A -x display doesn't include TTY or CPU stats by default
but they can be turned on with a -T or -C, respectively.
Submitted by: arundel (initial version)
Reviewed by: arundel
MFC after: 1 week
The columns for tty input and output may bump against each other
if the tty output needs more than 5 columns. Add a bit of space
that pushes everything 1 column to the right, but also avoids the
problem.
Approved by: re (rwatson)
The old logic padded the device name out but assumed the unit number was one digit
long; this fails for things like SATA devices which (for me) begin at ad10.
Assemble the full device name in a temporary buffer and then calcluate padding
based on that string.
Use ioctl() to get the window size in iostat(8), and force a new
header to be prepended to the output every time the current
window size changes. Change the number of lines before each
header to `rows - 3' when the terminal is resized, so that the
full terminal length can be used for output lines.
PR: bin/119705
Submitted by: keramida
Approved by: maxim
MFC after: 2 weeks
- Pass the address of the variable we are reading to kvm_read() rather
than the index into the nlist array.
- Properly report errors from kvm_read() which returns -1 on error, not
0.
MFC after: 3 days
o Implement Solaris-like -z flag: omit lines for devices with no activity.
o iostat.8: describe -x and -z flags, Xr devstat(3), touch .Dd.
PR: mostly bin/68840, with style changes; bin/73327
Submitted by: Dan Nelson, Peter Schuller
Obtained from: NetBSD (a part of man page)
MFC after: 1 month
and libdevstat, since the new way of doing things is to just list
maintainership in src/MAINTAINERS.
Also, remove duplicate entries in src/MAINTAINERS for those utilities. I
already had entries for them.
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
vmstat so that they never coalesce. Both iostat and vmstat need larger
fixes to prevent wide fields from unnecessarily messing up the alignment
of all subsequent fields.
PR: 41674
MFC-after: 3 days
originally written in January, 2000, but have been substantially updated.
- No longer use hz/stathz and the CPU times in computing the TTY stats,
but rather use etime, like the disk stats.
- Clean up malloc/realloc failure tests.
- Use a new integrated routine to fetch devstat information via sysctl or
KVM.
- Get rid of the X() macro for calculating CPU stats
- Use rint() on the CPU state display to avoid truncation errors. (this
requires libm)
- Clean up flag usage somewhat.
Reviewed by: bde
crash dumps, and make it use sysctl for all data retrievals in the
"live" case (i.e. when not using iostat on a crash dump).
Remove setgid kmem for the iostat executable, it is not needed any
more after these changes.
Reviewed by: ken
