From a62a217748339e89c09e6252b05b452009823db2 Mon Sep 17 00:00:00 2001
From: Tengfei Fan <tengfeif@codeaurora.org>
Date: Mon, 24 May 2021 14:22:28 +0800
Subject: [PATCH] sched/fair: Add sched_sync_hint_enable node

Add sched_sync_hint_enable not to enable/disable sync.

Change-Id: I455545487d002b4e3caf96c6cf8569549c3b1bbe
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>
---
 kernel/sched/walt/sysctl.c   | 10 ++++++++++
 kernel/sched/walt/walt.h     |  1 +
 kernel/sched/walt/walt_cfs.c |  3 ++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/walt/sysctl.c b/kernel/sched/walt/sysctl.c
index e7738f397f09..818117c03616 100644
--- a/kernel/sched/walt/sysctl.c
+++ b/kernel/sched/walt/sysctl.c
@@ -56,6 +56,7 @@ unsigned int sysctl_sched_min_task_util_for_colocation = 35;
 unsigned int sysctl_sched_many_wakeup_threshold = WALT_MANY_WAKEUP_DEFAULT;
 const int sched_user_hint_max = 1000;
 unsigned int sysctl_walt_rtg_cfs_boost_prio = 99; /* disabled by default */
+unsigned int sysctl_sched_sync_hint_enable = 1;
 
 /* range is [1 .. INT_MAX] */
 static int sysctl_task_read_pid = 1;
@@ -661,6 +662,15 @@ struct ctl_table walt_table[] = {
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_ONE,
 	},
+	{
+		.procname       = "sched_sync_hint_enable",
+		.data           = &sysctl_sched_sync_hint_enable,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
 	{
 		.procname	= "sched_lib_name",
 		.data		= sched_lib_name,
diff --git a/kernel/sched/walt/walt.h b/kernel/sched/walt/walt.h
index e4012126a0b7..5f27c897fe42 100644
--- a/kernel/sched/walt/walt.h
+++ b/kernel/sched/walt/walt.h
@@ -277,6 +277,7 @@ extern unsigned int sysctl_sched_walt_rotate_big_tasks;
 extern unsigned int sysctl_sched_task_unfilter_period;
 extern unsigned int __read_mostly sysctl_sched_asym_cap_sibling_freq_match_pct;
 extern unsigned int sysctl_walt_low_latency_task_threshold; /* disabled by default */
+extern unsigned int sysctl_sched_sync_hint_enable;
 extern struct ctl_table walt_table[];
 extern struct ctl_table walt_base_table[];
 extern void walt_tunables(void);
diff --git a/kernel/sched/walt/walt_cfs.c b/kernel/sched/walt/walt_cfs.c
index ae996ed8fccc..a647b7a726e7 100644
--- a/kernel/sched/walt/walt_cfs.c
+++ b/kernel/sched/walt/walt_cfs.c
@@ -544,7 +544,8 @@ int walt_find_energy_efficient_cpu(struct task_struct *p, int prev_cpu,
 	if (sync && (need_idle || (is_rtg && curr_is_rtg)))
 		sync = 0;
 
-	if (sync && bias_to_this_cpu(p, cpu, start_cpu)) {
+	if (sysctl_sched_sync_hint_enable && sync
+			&& bias_to_this_cpu(p, cpu, start_cpu)) {
 		best_energy_cpu = cpu;
 		fbt_env.fastpath = SYNC_WAKEUP;
 		goto done;