kern: proc: Add enhanced processor arbitration

Unlike the previouses systems where there was a global arbiter and a
shared lock, rv7 derives a zero-based processor index by using the lower
8 bits of the pid MOD the core count. This significantly reduces
contention.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/inc/os/process.h b/sys/inc/os/process.h
index a2e3fdd..24db3e1 100644
--- a/sys/inc/os/process.h
+++ b/sys/inc/os/process.h
@@ -43,11 +43,13 @@
  * system
  *
  * @pid: Process ID
+ * @affinity: Processor affinity
  * @pcb: Process control block
  * @link: Queue link
  */
 struct process {
     pid_t pid;
+    id_t affinity;
     struct pcb pcb;
     TAILQ_ENTRY(process) link;
 };