Changeset 25939997 in mainline for kernel/generic/src/main/main.c

Timestamp:

2024-01-19T16:21:20Z (9 months ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

c1eaec4

Parents:

1c1767f

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-04-16 19:36:25)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2024-01-19 16:21:20)

Message:

Make separate-stack-scheduler a loop with persistent context

We can see scheduler as a looping idle thread in which a thread
is repeatedly retrieved from a queue, prepared, switched to,
returned from, and cleaned up after.

IMO this is a more natural view of the process.

File:

• kernel/generic/src/main/main.c (modified) (3 diffs)

kernel/generic/src/main/main.c

@@ -287 +287 @@
          * starting the thread of kernel threads.
          */
-        scheduler_run();
+        current_copy(CURRENT, (current_t *) CPU_LOCAL->stack);
+        context_replace(scheduler_run, CPU_LOCAL->stack, STACK_SIZE);
         /* not reached */
 }
@@ -327 +328 @@
         ARCH_OP(post_cpu_init);
 
-        current_copy(CURRENT, (current_t *) CPU_LOCAL->stack);
-
         /*
          * If we woke kmp up before we left the kernel stack, we could
@@ -334 +333 @@
          * switch to this cpu's private stack prior to waking kmp up.
          */
+        current_copy(CURRENT, (current_t *) CPU_LOCAL->stack);
         context_replace(main_ap_separated_stack, CPU_LOCAL->stack, STACK_SIZE);
         /* not reached */