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Commit 1aeb977e authored by Pavankumar Kondeti's avatar Pavankumar Kondeti Committed by Gerrit - the friendly Code Review server
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core_ctl: Add a kernel parameter to disable core_ctl 



Add a kernel parameter called "core_ctl_disable_cpumask" to
specify the CPUs for which core_ctl is not needed. As
core_ctl operates on a cluster basis, all of the CPUs in a
given cluster must be specified to disable core_ctl on that
cluster.

Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
[markivx: doc moved to Documentation/admin-guide/]
Signed-off-by: default avatarVikram Mulukutla <markivx@codeaurora.org>

Change-Id: I2468b10d4f8b1c9ddcdb8e2eb10124975a6a34d4
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent 8754b7f9

Documentation/admin-guide/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -648,6 +648,12 @@ 
			seconds. Defaults to 10*60 = 10mins. A value of 0

			disables the blank timer.



	core_ctl_disable_cpumask= [SMP]

			Exempt the CPUs from being managed by core_ctl.

			core_ctl operates on a cluster basis. So all the

			CPUs in a given cluster must be specified to disable

			core_ctl for that cluster.



	coredump_filter=

			[KNL] Change the default value for

			/proc/<pid>/coredump_filter.

kernel/sched/core_ctl.c

+42 −0
Original line number Diff line number Diff line
@@ -931,6 +931,42 @@ static struct notifier_block __refdata cpu_notifier = { 


/* ============================ init code ============================== */



static cpumask_var_t core_ctl_disable_cpumask;

static bool core_ctl_disable_cpumask_present;



static int __init core_ctl_disable_setup(char *str)

{

	if (!*str)

		return -EINVAL;



	alloc_bootmem_cpumask_var(&core_ctl_disable_cpumask);



	if (cpulist_parse(str, core_ctl_disable_cpumask) < 0) {

		free_bootmem_cpumask_var(core_ctl_disable_cpumask);

		return -EINVAL;

	}



	core_ctl_disable_cpumask_present = true;

	pr_info("disable_cpumask=%*pbl\n",

			cpumask_pr_args(core_ctl_disable_cpumask));



	return 0;

}

early_param("core_ctl_disable_cpumask", core_ctl_disable_setup);



static bool should_skip(const struct cpumask *mask)

{

	if (!core_ctl_disable_cpumask_present)

		return false;



	/*

	 * We operate on a cluster basis. Disable the core_ctl for

	 * a cluster, if all of it's cpus are specified in

	 * core_ctl_disable_cpumask

	 */

	return cpumask_subset(mask, core_ctl_disable_cpumask);

}



static struct cluster_data *find_cluster_by_first_cpu(unsigned int first_cpu)

{

	unsigned int i;
@@ -952,6 +988,9 @@ static int cluster_init(const struct cpumask *mask) 
	unsigned int cpu;

	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };



	if (should_skip(mask))

		return 0;



	if (find_cluster_by_first_cpu(first_cpu))

		return 0;
@@ -1052,6 +1091,9 @@ static int __init core_ctl_init(void) 
{

	unsigned int cpu;



	if (should_skip(cpu_possible_mask))

		return 0;



	core_ctl_check_interval = (rq_avg_period_ms - RQ_AVG_TOLERANCE)

					* NSEC_PER_MSEC;