From 054708dab89a5519dcc2e6cb3112a6cddc4a8514 Mon Sep 17 00:00:00 2001
From: Kai Krakow <kai@kaishome.de>
Date: Sun, 17 Nov 2019 17:55:28 +0100
Subject: [PATCH] crucible: Schedule loadavg calculator as fast as possible

We want the loadavg calculation to be almost real-time. If SCHED_ISO is
not supported, it will use whatever the service was started with
(SCHED_OTHER by default).

Signed-off-by: Kai Krakow <kai@kaishome.de>
---
 lib/task.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/task.cc b/lib/task.cc
index 716ebebe..cbd20bbb 100644
--- a/lib/task.cc
+++ b/lib/task.cc
@@ -594,6 +594,8 @@ namespace crucible {
 	void
 	TaskMasterState::loadavg_thread_fn()
 	{
+		sched_param param = { .sched_priority = 0 };
+		pthread_setschedparam(pthread_self(), SCHED_ISO, &param);
 		pthread_setname_np(pthread_self(), "load_tracker");
 		while (!m_cancelled) {
 			adjust_thread_count();