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Date:      Mon, 15 Dec 2025 12:49:08 -0800
From:      Mark Millard <marklmi@yahoo.com>
To:        Steve Kargl <kargls@comcast.net>
Cc:        freebsd-hackers <freebsd-hackers@freebsd.org>
Subject:   Re: profiling a user executable?
Message-ID:  <920EC775-E8F9-4A10-A619-3A9C8B563C11@yahoo.com>
In-Reply-To: <47F509B6-F536-4E70-9226-16630128EC38@yahoo.com>
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Hello again,

https://man.freebsd.org/cgi/man.cgi?query=pmc.amd&apropos=0&sektion=3&manpath=FreeBSD+16.0-CURRENT&arch=default&format=html

documents for pmc.amd contexts:

Event Name Aliases
       Event name aliases are PMC-independent names for	commonly used  events.
       The following aliases are known to this version of the pmc library:

       branches
	       Measure the number of branches retired.

       branch-mispredicts
	       Measure the number of retired branches that were	mispredicted.

       cycles  Measure	processor cycles.  This	event is implemented using the
	       processor's Time	Stamp Counter register.

       dc-misses
	       Measure the number of data cache	misses.

       ic-misses
	       Measure the number of instruction cache misses.

       instructions
	       Measure the number of instructions retired.

       interrupts
	       Measure the number of interrupts	seen.

       unhalted-cycles
	       Measure the number of cycles the	processor is not in  a	halted
	       or sleep	state.

Modern ZEN documention does have some correspondance to the
pmc.amd(3) documentation, for example for 76H and C0H having
material similar to the k8-* descriptions, if you ignore the
k8-* naming:

   AMD K8 Event	Specifiers
       The event specifiers supported on AMD K8	PMCs are:

       k8-bu-cpu-clk-unhalted
	       (Event  76H)  Count  the	number of clock	cycles when the	CPU is
	       not in the HLT or STPCLK	states.
 . . .
       k8-fr-retired-x86-instructions
	       (Event C0H) Count retired x86 instructions including exceptions
	       and interrupts.
. . .

Just ignore the k8-* names and use the Aliases for amd.

But the directory name created will be the modern detailed
one, such as: ls_not_halted_cyc/ for the 76H for what I'm
using.

The aliases do not extend to aarch64, and probably not to intel.

It does look like some Intel processors have C0H being similar
to amd, such as man pmc.sandybridge reporting:

       INST_RETIRED.ANY_P
	       (Event C0H, Umask 00H) Number of	instructions at	retirement.

       INST_RETIRED.PREC_DIST
	       (Event  C0H,  Umask 01H)	Precise	instruction retired event with
	       HW to reduce effect of PEBS  shadow  in	IP  distribution  PMC1
	       only; Must quiesce other	PMCs.

       INST_RETIRED.X87
	       (Event C0H, Umask 02H) X87 instruction retired event.

But I did not find a 76H.


===
Mark Millard
marklmi at yahoo.com
help

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