From 9997429cb7f960a1a08c7dfb4848a0cb60107f57 Mon Sep 17 00:00:00 2001
From: Vasilij Schneidermann <v.schneidermann@gmail.com>
Date: Thu, 27 Jun 2019 20:18:20 +0200
Subject: [PATCH] Allow for retrieving profiler logs after stopping

* lisp/profiler.el (profiler-cpu-log, profiler-memory-log): New
variables.
(profiler-cpu-profile): Work even if the profiler is no longer
running (bug#22114).
(profiler-memory-profile): Ditto.
(profiler-stop): Save the data.
(profiler-reset): Clear the saved data.
(profiler-report-cpu, profiler-report-memory): Report on the saved
data.
(profiler-report): Save the data here, too.
---
 lisp/profiler.el | 59 ++++++++++++++++++++++++++++--------------------
 1 file changed, 35 insertions(+), 24 deletions(-)

diff --git a/lisp/profiler.el b/lisp/profiler.el
index 45dc1d1edc0..74b847c8d74 100644
--- a/lisp/profiler.el
+++ b/lisp/profiler.el
@@ -213,21 +213,22 @@ Optional argument MODE means only check for the specified mode (cpu or mem)."
         (t (or (profiler-running-p 'cpu)
                (profiler-running-p 'mem)))))
 
+(defvar profiler-cpu-log nil)
+(defvar profiler-memory-log nil)
+
 (defun profiler-cpu-profile ()
   "Return CPU profile."
-  (when (profiler-running-p 'cpu)
-    (profiler-make-profile
-     :type 'cpu
-     :timestamp (current-time)
-     :log (profiler-cpu-log))))
+  (profiler-make-profile
+   :type 'cpu
+   :timestamp (current-time)
+   :log profiler-cpu-log))
 
 (defun profiler-memory-profile ()
   "Return memory profile."
-  (when (profiler-memory-running-p)
-    (profiler-make-profile
-     :type 'memory
-     :timestamp (current-time)
-     :log (profiler-memory-log))))
+  (profiler-make-profile
+   :type 'memory
+   :timestamp (current-time)
+   :log profiler-memory-log))
 
 
 ;;; Calltrees
@@ -829,7 +830,12 @@ Also, if MODE is `mem' or `cpu+mem', then memory profiler will be started."
 (defun profiler-stop ()
   "Stop started profilers.  Profiler logs will be kept."
   (interactive)
-  (let ((cpu (if (fboundp 'profiler-cpu-stop) (profiler-cpu-stop)))
+  (when (and (fboundp 'profiler-cpu-running-p)
+             (profiler-cpu-running-p))
+    (setq profiler-cpu-log (profiler-cpu-log)))
+  (when (profiler-memory-running-p)
+    (setq profiler-memory-log (profiler-memory-log)))
+  (let ((cpu (when (fboundp 'profiler-cpu-stop) (profiler-cpu-stop)))
         (mem (profiler-memory-stop)))
     (message "%s profiler stopped"
              (cond ((and mem cpu) "CPU and memory")
@@ -840,26 +846,31 @@ Also, if MODE is `mem' or `cpu+mem', then memory profiler will be started."
 (defun profiler-reset ()
   "Reset profiler logs."
   (interactive)
-  (when (fboundp 'profiler-cpu-log)
-    (ignore (profiler-cpu-log)))
-  (ignore (profiler-memory-log))
-  t)
+  (when (and (fboundp 'profiler-cpu-running-p) (profiler-cpu-running-p))
+    (profiler-cpu-stop))
+  (when (profiler-memory-running-p)
+    (profiler-memory-stop))
+  (setq profiler-cpu-log nil
+        profiler-memory-log nil))
 
 (defun profiler-report-cpu ()
-  (let ((profile (profiler-cpu-profile)))
-    (when profile
-      (profiler-report-profile-other-window profile))))
+  (when profiler-cpu-log
+    (profiler-report-profile-other-window (profiler-cpu-profile))))
 
 (defun profiler-report-memory ()
-  (let ((profile (profiler-memory-profile)))
-    (when profile
-      (profiler-report-profile-other-window profile))))
+  (when profiler-memory-log
+    (profiler-report-profile-other-window (profiler-memory-profile))))
 
 (defun profiler-report ()
   "Report profiling results."
-  (interactive)
-  (profiler-report-cpu)
-  (profiler-report-memory))
+  (when (and (fboundp 'profiler-cpu-running-p) (profiler-cpu-running-p))
+    (setq profiler-cpu-log (profiler-cpu-log)))
+  (when (profiler-memory-running-p)
+    (setq profiler-memory-log (profiler-memory-log)))
+  (if (and (not profiler-cpu-log) (not profiler-memory-log))
+      (user-error "No profiler run recorded")
+    (profiler-report-cpu)
+    (profiler-report-memory)))
 
 ;;;###autoload
 (defun profiler-find-profile (filename)
-- 
2.39.2