of times the system was forced to sleep when requesting a new allocation.
Expand the debugger hook, db_show_uma, to display these results as well.
This has proven to be very useful in out of memory situations when
it is not known why systems have become sluggish or fail in odd ways.
Reviewed by: rwatson alc
Approved by: scottl (mentor) peter
Obtained from: Yahoo Inc.
Use ioctl() to get the window size in vmstat(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 the
current lines of the terminal when the terminal is resized, so that
the full terminal length can be used for output lines.
Inspired by: svn change 175562 (same feature for iostat)
Reviewed by: ru (who fixed some of my bugs too)
MFC after: 1 week
user/system/idle stats. -h feeds the memory column through
humanize_number() to reduce the amount of column overflowing. -H turns
this off. -h is turned on by default if stdout is a tty.
them unsigned I made the possible overflows hard to detect,
and it only saved 1 bit which isn't principal, even less now
that the underlying issue with the total of virtual memory has
been fixed. (For the record, it will overflow with >=2T of
VM total, with 32-bit ints used to keep counters in pages.)
- While here, fix printing of other "struct vmtotal" members
such as t_rq, t_dw, t_pw, and t_sw as they are also signed.
Reviewed by: bde
MFC after: 3 days
- Fix overflow bugs in sysctl(8), systat(1), and vmstat(8)
when printing values of "struct vmmeter" in kilobytes as
they don't necessarily fit into 32 bits. (Fix sysctl(8)
reporting of a total virtual memory; it's in pages too.)
- Remove some extra blank lines.
- Remove comments that don't contribute to understanding.
- Remove additional blank lines in output added to maximize compatibility
with older vmstat output, but that is actually somewhat gratuitous.
Submitted by: bde
MFC with: other vmstat libmemstat(3) changes
statistics from -z are now a bit different due to changes in the
way statistics are now measured. Reproduce with some amount of
accuracy the slightly obscure layouts adopted by the two kernel
sysctls. In the future, we might want to normalize them.
GC dosysctl(), which is now no longer used.
MFC after: 1 week
malloc(9) statistics from kernel memory or a kernel coredump, to catch
up with recent changes to adopt per-CPU malloc(9) statistics. The new
routines walk the per-CPU statistics pools and coalesce them for
presentation to the user.
Fixed a nearby bug. The "play it safe" code in dosysctl() was unsafe
because it overran the buffer by 1 if sysctl() filled all of the buffer.
Fixed a nearby style bug in output. Not just 1, but 2 extra newlines
were printed at the end by "vmstat -m" and "vmstat -z". Don't print
any newlines explicitly. This depends on 2 of the many formatting
bugs in the corresponding sysctls. First, the sysctls return an extra
newline at the end of the strings. This also messes up output from
sysctl(8). Second, the sysctls return an extra newline at the beginning
of the strings. This is good for separating the 2 tables output by
"vmstat -mz" and for starting the header on a new line in plain sysctl
output, but gives a bogus extra newline at the beginning for "vm -[m | z]"
and "sysctl -n [kern.malloc | vm.zone]".
Fixed some nearby style bugs in the source code:
- the same line that misspelled 0 as NULL also spelled NULL as 0.
- the size was doubled twice in the realloc loop.
- the "play it safe" comment was misleading. Terminating the buffer
is bogus because dosysctl() is only meant to work with sysctls that
return strings and the terminator is part of a string. However, the
kern.malloc sysctl has more than style bugs. It also doesn't return
a string. Termination is needed to work around this bug.
- Replace overly-complicated (and buggy) -a logic with a much simpler
version: -a causes all interrupts to be displayed, otherwise only
those that have occurred are displayed. This removes the need for
any MD code.
- Instead of just making sure intrcnt is large enough, figure out the
exact size it needs to be. We derive nintr from this number, and we
don't want to risk printing garbage. Note that on sparc64, we end up
printing garbage anyway because the names of non-existent interrupts
are left uninitialized by the kernel.
Tested on: alpha, i386, sparc64
