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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix profiling)
+ #:use-module (ice-9 match)
+ #:export (profiled?
+ register-profiling-hook!))
+
+;;; Commentary:
+;;;
+;;; Basic support for Guix-specific profiling.
+;;;
+;;; Code:
+
+(define profiled?
+ (let ((profiled
+ (or (and=> (getenv "GUIX_PROFILING") string-tokenize)
+ '())))
+ (lambda (component)
+ "Return true if COMPONENT profiling is active."
+ (member component profiled))))
+
+(define %profiling-hooks
+ ;; List of profiling hooks.
+ (map (match-lambda
+ ("after-gc" after-gc-hook)
+ ((or "exit" #f) exit-hook))
+ (or (and=> (getenv "GUIX_PROFILING_EVENTS") string-tokenize)
+ '("exit"))))
+
+(define (register-profiling-hook! component thunk)
+ "Register THUNK as a profiling hook for COMPONENT, a string such as
+\"rpc\"."
+ (when (profiled? component)
+ (for-each (lambda (hook)
+ (add-hook! hook thunk))
+ %profiling-hooks)))