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cpumask: Add cpu isolation support

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Add bitmask and corresponding supporting functions for cpu isolation.

Change-Id: Ice1a9503666a2b720bdb324289ca55ceb33097cd
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
This commit is contained in:
Olav Haugan 2016-05-29 19:56:37 -07:00
parent 922fed628c
commit fc70615291
2 changed files with 25 additions and 0 deletions
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8
include/linux/cpumask.h
View file

@ -53,6 +53,7 @@ extern int nr_cpu_ids;
* cpu_present_mask - has bit 'cpu' set iff cpu is populated
* cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
* cpu_active_mask - has bit 'cpu' set iff cpu available to migration
* cpu_isolated_mask- has bit 'cpu' set iff cpu isolated
*
* If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
*
@ -89,25 +90,30 @@ extern const struct cpumask *const cpu_possible_mask;
extern const struct cpumask *const cpu_online_mask;
extern const struct cpumask *const cpu_present_mask;
extern const struct cpumask *const cpu_active_mask;
extern const struct cpumask *const cpu_isolated_mask;
#if NR_CPUS > 1
#define num_online_cpus() cpumask_weight(cpu_online_mask)
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
#define num_present_cpus() cpumask_weight(cpu_present_mask)
#define num_active_cpus() cpumask_weight(cpu_active_mask)
#define num_isolated_cpus() cpumask_weight(cpu_isolated_mask)
#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
#define cpu_isolated(cpu) cpumask_test_cpu((cpu), cpu_isolated_mask)
#else
#define num_online_cpus() 1U
#define num_possible_cpus() 1U
#define num_present_cpus() 1U
#define num_active_cpus() 1U
#define num_isolated_cpus() 0U
#define cpu_online(cpu) ((cpu) == 0)
#define cpu_possible(cpu) ((cpu) == 0)
#define cpu_present(cpu) ((cpu) == 0)
#define cpu_active(cpu) ((cpu) == 0)
#define cpu_isolated(cpu) ((cpu) == 0)
#endif
/* verify cpu argument to cpumask_* operators */
@ -714,12 +720,14 @@ extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
#define for_each_isolated_cpu(cpu) for_each_cpu((cpu), cpu_isolated_mask)
/* Wrappers for arch boot code to manipulate normally-constant masks */
void set_cpu_possible(unsigned int cpu, bool possible);
void set_cpu_present(unsigned int cpu, bool present);
void set_cpu_online(unsigned int cpu, bool online);
void set_cpu_active(unsigned int cpu, bool active);
void set_cpu_isolated(unsigned int cpu, bool isolated);
void init_cpu_present(const struct cpumask *src);
void init_cpu_possible(const struct cpumask *src);
void init_cpu_online(const struct cpumask *src);

17
kernel/cpu.c
View file

@ -768,6 +768,10 @@ static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly;
const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits);
EXPORT_SYMBOL(cpu_active_mask);
static DECLARE_BITMAP(cpu_isolated_bits, CONFIG_NR_CPUS) __read_mostly;
const struct cpumask *const cpu_isolated_mask = to_cpumask(cpu_isolated_bits);
EXPORT_SYMBOL(cpu_isolated_mask);
void set_cpu_possible(unsigned int cpu, bool possible)
{
if (possible)
@ -802,6 +806,14 @@ void set_cpu_active(unsigned int cpu, bool active)
cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits));
}
void set_cpu_isolated(unsigned int cpu, bool isolated)
{
if (isolated)
cpumask_set_cpu(cpu, to_cpumask(cpu_isolated_bits));
else
cpumask_clear_cpu(cpu, to_cpumask(cpu_isolated_bits));
}
void init_cpu_present(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_present_bits), src);
@ -817,6 +829,11 @@ void init_cpu_online(const struct cpumask *src)
cpumask_copy(to_cpumask(cpu_online_bits), src);
}
void init_cpu_isolated(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_isolated_bits), src);
}
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)