- lower-migration-thread-stop-machine-prio.patch removed from -mm tree

[akpm@xxxxxxxx]

The patch titled

     lower migration thread/stop machine prio

has been removed from the -mm tree.  Its filename is

     lower-migration-thread-stop-machine-prio.patch

This patch was dropped because it was nacked by the maintainer

------------------------------------------------------
Subject: lower migration thread/stop machine prio
From: Daniel Walker <dwalker@xxxxxxxxxx>

We should give some space at the top to allow things to schedule above
everything in a default system.  I think this takes better advantage of all
the priorities we have.

This moves the stop_machine and migration threads to SCHED_FIFO prio 80.

Signed-off-by: Daniel Walker <dwalker@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 include/linux/sched.h        |    3 +++
 include/linux/stop_machine.h |    3 +++
 kernel/sched.c               |    3 +--
 kernel/stop_machine.c        |    2 +-
 4 files changed, 8 insertions(+), 3 deletions(-)

diff -puN include/linux/sched.h~lower-migration-thread-stop-machine-prio include/linux/sched.h
--- a/include/linux/sched.h~lower-migration-thread-stop-machine-prio
+++ a/include/linux/sched.h
@@ -507,6 +507,9 @@ struct signal_struct {
 #define is_rt_policy(p)		((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
 #define has_rt_policy(p)	unlikely(is_rt_policy((p)->policy))
 
+/* Must be high prio: stop_machine expects to yield to it. */
+#define MIGRATION_THREAD_PRIO (MAX_RT_PRIO-20)
+
 /*
  * Some day this will be a full-fledged user tracking system..
  */
diff -puN include/linux/stop_machine.h~lower-migration-thread-stop-machine-prio include/linux/stop_machine.h
--- a/include/linux/stop_machine.h~lower-migration-thread-stop-machine-prio
+++ a/include/linux/stop_machine.h
@@ -8,6 +8,9 @@
 #include <asm/system.h>
 
 #if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
+
+#define STOP_MACHINE_PRIO (MAX_RT_PRIO-20)
+
 /**
  * stop_machine_run: freeze the machine on all CPUs and run this function
  * @fn: the function to run
diff -puN kernel/sched.c~lower-migration-thread-stop-machine-prio kernel/sched.c
--- a/kernel/sched.c~lower-migration-thread-stop-machine-prio
+++ a/kernel/sched.c
@@ -5209,9 +5209,8 @@ migration_call(struct notifier_block *nf
 			return NOTIFY_BAD;
 		p->flags |= PF_NOFREEZE;
 		kthread_bind(p, cpu);
-		/* Must be high prio: stop_machine expects to yield to it. */
 		rq = task_rq_lock(p, &flags);
-		__setscheduler(p, SCHED_FIFO, MAX_RT_PRIO-1);
+		__setscheduler(p, SCHED_FIFO, MIGRATION_THREAD_PRIO);
 		task_rq_unlock(rq, &flags);
 		cpu_rq(cpu)->migration_thread = p;
 		break;
diff -puN kernel/stop_machine.c~lower-migration-thread-stop-machine-prio kernel/stop_machine.c
--- a/kernel/stop_machine.c~lower-migration-thread-stop-machine-prio
+++ a/kernel/stop_machine.c
@@ -89,7 +89,7 @@ static void stopmachine_set_state(enum s
 static int stop_machine(void)
 {
 	int i, ret = 0;
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+	struct sched_param param = { .sched_priority = STOP_MACHINE_PRIO };
 
 	/* One high-prio thread per cpu.  We'll do this one. */
 	sched_setscheduler(current, SCHED_FIFO, &param);
_

Patches currently in -mm which might be from dwalker@xxxxxxxxxx are

origin.patch
docs-small-kbuild-cleanup.patch
lower-migration-thread-stop-machine-prio.patch
profile-likely-unlikely-macros.patch

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