- use a more accurate and more efficient method of compensating for
overheads. The old method counted too much time against leaf
functions.
- normally use the Pentium timestamp counter if available.
On Pentiums, the times are now accurate to within a couple of cpu
clock cycles per function call in the (unlikely) event that there
are no cache misses in or caused by the profiling code.
- optionally use an arbitrary Pentium event counter if available.
- optionally regress to using the i8254 counter.
- scaled the i8254 counter by a factor of 128. Now the i8254 counters
overflow slightly faster than the TSC counters for a 150MHz Pentium :-)
(after about 16 seconds). This is to avoid fractional overheads.
files.i386:
permon.c temporarily has to be classified as a profiling-routine
because a couple of functions in it may be called from profiling code.
options.i386:
- I586_CTR_GUPROF is currently unused (oops).
- I586_PMC_GUPROF should be something like 0x70000 to enable (but not
use unless prof_machdep.c is changed) support for Pentium event
counters. 7 is a control mode and the counter number 0 is somewhere
in the 0000 bits (see perfmon.h for the encoding).
profile.h:
- added declarations.
- cleaned up separation of user mode declarations.
prof_machdep.c:
Mostly clock-select changes. The default clock can be changed by
editing kmem. There should be a sysctl for this.
subr_prof.c:
- added copyright.
- calibrate overheads for the new method.
- documented new method.
- fixed races and and machine dependencies in start/stop code.
mcount.c:
Use the new overhead compensation method.
gmon.h:
- changed GPROF4 counter type from unsigned to int. Oops, this should
be machine-dependent and/or int32_t.
- reorganized overhead counters.
Submitted by: Pentium event counter changes mostly by wollman
add free vnodes back to the freelist. They must do their own vnode
management. Anyway, this change is *only* activated with their filesystem
and doesn't affect anyone else. Whoops, forgot the submitted-by lines
in my previous commits too.. :-(
Submitted-By: Tony Ardolino <tony@netcon.com>
It happens if 1) regular passwords not allowed, 2) skey database
not activated for given user.
Under some rare circumstanes skey_challenge can return empty
diagnostic or even previous buffer, fix it.
API and non-API functions and giving _sk_ prefix for all non-API
functions. Old names will be available by _SKEY_INTERNAL define
it allows not change anything in keyinit & key, only -D_SKEY_INTERNAL required.
Staticise some things.
The heuristic for managment of memory backing the buffer cache was
nice, but didn't work due to some architectural problems. Simplify
and improve the algorithm.
for the GPROF4 case. This allows a simpler method to be used for
non-statistical profiling (it allows overhead adjustments to be
subtracted from one counter without harm if that counter goes
negative; otherwise the adjustment would have to be distributed).
32 bit counters were already too small for GPROF4 with a 200MHz
clock. int64_t counters should be used.
- use CROSSJUMP() and CROSSJUMP_LABEL() for conditional jumps from idle()
into cpu_switch() and vice versa.
- moved badsw code to after cpu_switch().
Cosmetic changes:
- moved sw0 string to be immediately after its caller (badsw).
- removed unused #include.
Man page to come...
For now use: <brandelf -t Linux linuxbin> to brand, and just
<brandelf> to verify branding on a ELF file. FreeBSD native is
set with <brandelf -t FreeBSD freebsdbin>.
Dmitry Kohmanyuk <dk@farm.org>
Lars Koeller <Lars_Koeller@odie.physik2.uni-rostock.de>
Michael Searle <searle@longacre.demon.co.uk>
MOROHOSHI Akihiko <moro@race.u-tokyo.ac.jp>
Ronald Kuehn <kuehn@rz.tu-clausthal.de>
Ville Eerola <ve@sci.fi>
Yukihiro Nakai <nakai@mlab.t.u-tokyo.ac.jp>
Updated following people's addresses:
Brian Clapper, Hideaki Ohmon, Jian-Da Li, Jim Lowe
Removed &a.andreas; as he's listed in the developpers section.
