boot_time_opt: update host boot time optimization patches for 4.14

The new patches are based on:
https://github.com/clearlinux-pkgs/linux-lts
commit 5595fe425a52af6734235a1a953b6b03210060ec

Signed-off-by: Martin Borg <martin.borg@enea.com>
Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/patches/boot_time_opt/0109-init_task-faster-timerslack.patch b/patches/boot_time_opt/0109-init_task-faster-timerslack.patch
new file mode 100644
index 0000000..9687012
--- /dev/null
+++ b/patches/boot_time_opt/0109-init_task-faster-timerslack.patch
@@ -0,0 +1,34 @@
+From 4c35ad2b763bca4e0eaf449d42a0e4c49197da2c Mon Sep 17 00:00:00 2001
+From: Arjan van de Ven <arjan@linux.intel.com>
+Date: Wed, 23 Mar 2016 14:52:41 +0000
+Subject: [PATCH 109/126] init_task: faster timerslack
+
+the default tuning is a compromise between client power and server
+performance;
+for a server distro like Clear Linux, we don't need to compromise.
+(for non-server usages we have different kernel binaries)
+
+in principle this can be done as a patch to systemd as well, but we have
+a shared
+systemd between usages while we have different kernels, so the logistics
+for where the patch goes work out better here
+---
+ include/linux/init_task.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/linux/init_task.h b/include/linux/init_task.h
+index 8062e6cc607c..2903519e2462 100644
+--- a/include/linux/init_task.h
++++ b/include/linux/init_task.h
+@@ -275,7 +275,7 @@ extern struct cred init_cred;
+        .journal_info   = NULL,                                         \
+        INIT_CPU_TIMERS(tsk)                                            \
+        .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
+-       .timer_slack_ns = 50000, /* 50 usec default slack */            \
++       .timer_slack_ns = 1000, /* 1 usec default slack */              \
+        .pids = {                                                       \
+                [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
+                [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
+-- 
+2.15.0
+