1 ;;;; Copyright 2009 Vitaly Mayatskikh <v.mayatskih@gmail.com>
3 ;;;; This file is a part of CL-Perfcounters
5 ;;;; Performance counters are special hardware registers available on most modern
6 ;;;; CPUs. These registers count the number of certain types of hw events: such
7 ;;;; as instructions executed, cachemisses suffered, or branches mis-predicted -
8 ;;;; without slowing down the kernel or applications. These registers can also
9 ;;;; trigger interrupts when a threshold number of events have passed - and can
10 ;;;; thus be used to profile the code that runs on that CPU.
12 ;;;; The Linux Performance Counter subsystem provides an abstraction of these
13 ;;;; hardware capabilities. It provides per task and per CPU counters, counter
14 ;;;; groups, and it provides event capabilities on top of those. It
15 ;;;; provides "virtual" 64-bit counters, regardless of the width of the
16 ;;;; underlying hardware counters.
18 ;;;; CL-Perfcounters is free software: you can redistribute it and/or modify
19 ;;;; it under the terms of the GNU General Public License as published by
20 ;;;; the Free Software Foundation, either version 3 of the License, or
21 ;;;; (at your option) any later version.
23 ;;;; CL-Perfcounters is distributed in the hope that it will be useful,
24 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
25 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 ;;;; GNU General Public License for more details.
28 ;;;; You should have received a copy of the GNU General Public License
29 ;;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
31 (defpackage #:perfcounters-system
34 (in-package #:perfcounters-system)
36 (defsystem perfcounters
39 :components ((:file "perfcounters")))
41 (defmethod perform :after ((o load-op) (c (eql (find-system :perfcounters))))
42 (provide 'perfcounters))