mirror of
https://git.FreeBSD.org/src.git
synced 2025-01-03 12:35:02 +00:00
d6b9e17eb5
- 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 |
||
|---|---|---|
| .. | ||
| pc | ||
| asmacros.h | ||
| clock.h | ||
| cpu.h | ||
| cpufunc.h | ||
| cputypes.h | ||
| db_machdep.h | ||
| exec.h | ||
| float.h | ||
| floatingpoint.h | ||
| fpu.h | ||
| frame.h | ||
| ieeefp.h | ||
| md_var.h | ||
| npx.h | ||
| pcb.h | ||
| pmap.h | ||
| proc.h | ||
| profile.h | ||
| psl.h | ||
| ptrace.h | ||
| reg.h | ||
| reloc.h | ||
| segments.h | ||
| signal.h | ||
| specialreg.h | ||
| sysarch.h | ||
| trap.h | ||
| tss.h | ||
| varargs.h | ||
| vmparam.h | ||