Use getpagesize()

Sat Apr 30 16:57:23 2005  Soeren Sandmann  <sandmann@redhat.com>

	* process.c (PAGE_SIZE): Use getpagesize()

	* TODO: More updates

ChangeLog

@@ -1,3 +1,9 @@
+Sat Apr 30 16:57:23 2005  Soeren Sandmann  <sandmann@redhat.com>
+
+	* process.c (PAGE_SIZE): Use getpagesize()
+
+	* TODO: More updates
+
 Sat Apr 30 15:44:12 2005  Søren Sandmann  <sandmann@redhat.com>
 
 	* TODO: Updates

TODO

@@ -27,14 +27,63 @@ Before 1.0:
 	    (ask for sucess/failure-stories in 0.9.x releases)
 	- auto*?
 	- .desktop file
-	- translation should be hooked up 
-
-
-
-
 
 Before 1.2:
 
+- translation should be hooked up 
+- Fixing the oops in kernels < 2.6.11
+
+	- Make the process waiting in poll() responsible for extracting
+	  the backtrace. Give a copy of the entire stack rather than doing
+	  the walk inside the kernel. That would allow us to do more complex 
+	  algorithms in userspace.
+
+		New model:
+			- Two arrays, 
+				one of actual scanned stacks
+				one of tasks that need to be scanned
+			  One wait queue,
+				wait for data
+
+			- in read() wait for stack data:
+				scan_tasks()
+				if (!stack_data)
+					return -EWOULDBLOCK;
+
+			  in poll()
+				while (!stack data) {
+					wait_for_data();
+					scan_tasks();
+				}
+				return READABLE;
+
+			  scan_tasks() is a function that converts waiting
+			  tasks into data, and wakes them up.
+
+			- in timer interrupt:
+
+				if (someone waiting in poll() &&
+				    current && current != that_someone &&
+				    current is runnable)
+				{
+					stop current;
+					add current to queue;
+					wake wait_for_data;
+				}
+
+			This way, we will have a real userspace process
+			that can take the page faults.
+
+- Find out how gdb does backtraces; they may have a better way. Also
+  find out what dwarf2 is and how to use it. Look into libunwind.
+  It seems gdb is capable of doing backtraces of code that neither has
+  a framepointer nor has debug info. It appears gdb uses the contents
+  of the ".eh_frame" section. There is also an ".eh_frame_hdr" section.
+
+http://www.linuxbase.org/spec/booksets/LSB-Embedded/LSB-Embedded/ehframe.html
+
+  look in dwarf2-frame.[ch] in the gdb distribution. 
+
 - Make busy cursors more intelligent
 	- when you click something in the main list and we don't respond
 		within 50ms (or perhaps when we expect to not be able to do
@@ -106,9 +155,6 @@ Before 1.2:
 - possibly add dependency on glib 2.8 if it is released at that point.
   (g_file_replace())
 
-- Find out how gdb does backtraces; they may have a better way. Also
-  find out what dwarf2 is and how to use it.
-
 
 Later:
 

process.c

@@ -24,12 +24,12 @@
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <errno.h>
+#include <unistd.h>
 
 #include "process.h"
 #include "binfile.h"
 
-/* FIXME: this should  be done with getpagesize() */
+#define PAGE_SIZE (getpagesize())
-#define PAGE_SIZE 4096
 
 static GHashTable *processes_by_cmdline;
 static GHashTable *processes_by_pid;

sfile.c

@@ -862,7 +862,7 @@ handle_begin_element (GMarkupParseContext *parse_context,
         return;
     }
 
-    /* FIXME: is there really a reason to add begin/end instructions for values? */
+    /* FIXME - not10: is there really a reason to add begin/end instructions for values? */
     instruction.name = g_strdup (element_name);
     instruction.kind = BEGIN;
     g_array_append_val (build->instructions, instruction);

sysprof.c

@@ -33,7 +33,7 @@
 #include "profile.h"
 #include "treeviewutils.h"
 
-/* FIXME */
+/* FIXME - not10 */
 #define _(a) a
 
 #define APPLICATION_NAME "System Profiler"
@@ -83,7 +83,7 @@ struct Application
     int			timeout_id;
     int			generating_profile;
     
-    gboolean		profile_from_file; /* FIXME: This is a kludge. Figure out how
+    gboolean		profile_from_file; /* FIXME - not10: This is a kludge. Figure out how
 					    * to maintain the application model properly
 					    *
 					    * The fundamental issue is that the state of
@@ -199,7 +199,7 @@ update_sensitivity (Application *app)
 			      sensitive_start_button);
     
 #if 0
-    /* FIXME: gtk+ doesn't handle changes in sensitivity in response
+    /* FIXME - not10: gtk+ doesn't handle changes in sensitivity in response 
      * to a click on the same button very well
      */
     gtk_widget_set_sensitive (GTK_WIDGET (app->reset_button),