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-rw-r--r--Porting68
1 files changed, 66 insertions, 2 deletions
diff --git a/Porting b/Porting
index b1ee25d05c46..c28fd378bb51 100644
--- a/Porting
+++ b/Porting
@@ -3,8 +3,6 @@ Instructions for porting top to other architectures.
This is still a preliminary document. Suggestions for improvement are
most welcome.
-My address is now "wnl@groupsys.com".
-
Before you embark on a port, please send me a mail message telling me
what platform you are porting top to. There are three reasons for
this: (1) I may already have a port, (2) module naming needs to be
@@ -163,3 +161,69 @@ change in one of the existing files, please contact me so that we can
discuss the details. I want to keep such changes as general as
possible.
+--------
+
+Changes were made to the module interface between 3.5 and 3.6. Here are
+the changes that need to be made to port a 3.5 module to 3.6:
+
+The array that stores memory statistics and is passed back in the system
+information structure as "memory" must now be an array of (signed) longs.
+This was done to more easily accomodate systems that have gigabytes of
+memory. Since the numbers are supposed to be kilobytes, a long can still
+represent up to 2 terabytes. Look for "int memory_stats[X]" (where "X"
+is some arbitrary number) and change it to "long memory_stats[X]". If
+the module support reporting swap information on a separate line, then
+its "swap_stats" array also needs to be an array of longs.
+
+The argument to proc_owner should be an int, as in "int pid". When it is
+used in proc_owner it should be cast as necessary. Many operating systems
+will require it to be cast to a pid_t before being compared to the appropriate
+element in the proc structure.
+
+In the function format_next_process, the last argument in the main call
+to sprintf is the string that contains the command for the process.
+Make sure that this last argument is enclosed in a call to "printable".
+For example: "printable(MPP(pp, p_comm))".
+
+The third argument to "get_process_info" needs to be changed to an integer,
+typically "int compare_index". The call to qsort in get_process_info may
+be guarded by "if (compare != NULL)". If it is, remove the if statement.
+
+The other changes to get_process_info depends on whether or not the module
+supports multiple sort orders.
+
+To support multiple keys:
+
+Create an array int (*proc_compares[])() and assign to it the list of
+comparison functions, NULL terminated. For example:
+
+int (*proc_compares[])() = {
+ compare_cpu,
+ compare_size,
+ compare_res,
+ compare_time,
+ NULL };
+
+In get_process_info there is a call to qsort which uses one of the
+functions in proc_compares. It should be changed so that its fourth
+argument is "proc_compares[compare_index]".
+
+If the module contains the function "proc_compare", it should be removed.
+
+There should also be a NULL-terminated array of strings which list the names
+for the sort keys, for example:
+
+char *ordernames[] =
+{"cpu", "size", "res", "time", NULL};
+
+To indicate that this module supports multiple sort keys, add the following
+line in machine_init:
+
+ statics->order_names = ordernames;
+
+If there is no support for multiple keys:
+
+Leave statics->order_names alone and call the comparison function of
+your choice in get_process_info, ignoring the third argument.
+
+