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Commit 3e201463 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull scheduler updates from Ingo Molnar:
 "The main updates in this cycle were:

   - Group balancing enhancements and cleanups (Brendan Jackman)

   - Move CPU isolation related functionality into its separate
     kernel/sched/isolation.c file, with related 'housekeeping_*()'
     namespace and nomenclature et al. (Frederic Weisbecker)

   - Improve the interactive/cpu-intense fairness calculation (Josef
     Bacik)

   - Improve the PELT code and related cleanups (Peter Zijlstra)

   - Improve the logic of pick_next_task_fair() (Uladzislau Rezki)

   - Improve the RT IPI based balancing logic (Steven Rostedt)

   - Various micro-optimizations:

   - better !CONFIG_SCHED_DEBUG optimizations (Patrick Bellasi)

   - better idle loop (Cheng Jian)

   - ... plus misc fixes, cleanups and updates"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (54 commits)
  sched/core: Optimize sched_feat() for !CONFIG_SCHED_DEBUG builds
  sched/sysctl: Fix attributes of some extern declarations
  sched/isolation: Document isolcpus= boot parameter flags, mark it deprecated
  sched/isolation: Add basic isolcpus flags
  sched/isolation: Move isolcpus= handling to the housekeeping code
  sched/isolation: Handle the nohz_full= parameter
  sched/isolation: Introduce housekeeping flags
  sched/isolation: Split out new CONFIG_CPU_ISOLATION=y config from CONFIG_NO_HZ_FULL
  sched/isolation: Rename is_housekeeping_cpu() to housekeeping_cpu()
  sched/isolation: Use its own static key
  sched/isolation: Make the housekeeping cpumask private
  sched/isolation: Provide a dynamic off-case to housekeeping_any_cpu()
  sched/isolation, watchdog: Use housekeeping_cpumask() instead of ad-hoc version
  sched/isolation: Move housekeeping related code to its own file
  sched/idle: Micro-optimize the idle loop
  sched/isolcpus: Fix "isolcpus=" boot parameter handling when !CONFIG_CPUMASK_OFFSTACK
  x86/tsc: Append the 'tsc=' description for the 'tsc=unstable' boot parameter
  sched/rt: Simplify the IPI based RT balancing logic
  block/ioprio: Use a helper to check for RT prio
  sched/rt: Add a helper to test for a RT task
  ...
parents f2be8bd5 765cc3a4

Documentation/admin-guide/kernel-parameters.txt

+28 −12
Original line number Diff line number Diff line
@@ -1730,20 +1730,33 @@ 
	isapnp=		[ISAPNP]

			Format: <RDP>,<reset>,<pci_scan>,<verbosity>



	isolcpus=	[KNL,SMP] Isolate CPUs from the general scheduler.

			The argument is a cpu list, as described above.



			This option can be used to specify one or more CPUs

			to isolate from the general SMP balancing and scheduling

			algorithms. You can move a process onto or off an

			"isolated" CPU via the CPU affinity syscalls or cpuset.

	isolcpus=	[KNL,SMP] Isolate a given set of CPUs from disturbance.

			[Deprecated - use cpusets instead]

			Format: [flag-list,]<cpu-list>



			Specify one or more CPUs to isolate from disturbances

			specified in the flag list (default: domain):



			nohz

			  Disable the tick when a single task runs.

			domain

			  Isolate from the general SMP balancing and scheduling

			  algorithms. Note that performing domain isolation this way

			  is irreversible: it's not possible to bring back a CPU to

			  the domains once isolated through isolcpus. It's strongly

			  advised to use cpusets instead to disable scheduler load

			  balancing through the "cpuset.sched_load_balance" file.

			  It offers a much more flexible interface where CPUs can

			  move in and out of an isolated set anytime.



			  You can move a process onto or off an "isolated" CPU via

			  the CPU affinity syscalls or cpuset.

			  <cpu number> begins at 0 and the maximum value is

			  "number of CPUs in system - 1".



			This option is the preferred way to isolate CPUs. The

			alternative -- manually setting the CPU mask of all

			tasks in the system -- can cause problems and

			suboptimal load balancer performance.

			The format of <cpu-list> is described above.







	iucv=		[HW,NET]
@@ -4209,6 +4222,9 @@ 
			Used to run time disable IRQ_TIME_ACCOUNTING on any

			platforms where RDTSC is slow and this accounting

			can add overhead.

			[x86] unstable: mark the TSC clocksource as unstable, this

			marks the TSC unconditionally unstable at bootup and

			avoids any further wobbles once the TSC watchdog notices.



	turbografx.map[2|3]=	[HW,JOY]

			TurboGraFX parallel port interface

drivers/base/cpu.c

+10 −1
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/cpufeature.h>

#include <linux/tick.h>

#include <linux/pm_qos.h>

#include <linux/sched/isolation.h>



#include "base.h"
@@ -271,8 +272,16 @@ static ssize_t print_cpus_isolated(struct device *dev, 
				  struct device_attribute *attr, char *buf)

{

	int n = 0, len = PAGE_SIZE-2;

	cpumask_var_t isolated;



	n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(cpu_isolated_map));

	if (!alloc_cpumask_var(&isolated, GFP_KERNEL))

		return -ENOMEM;



	cpumask_andnot(isolated, cpu_possible_mask,

		       housekeeping_cpumask(HK_FLAG_DOMAIN));

	n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(isolated));



	free_cpumask_var(isolated);



	return n;

}

drivers/net/ethernet/tile/tilegx.c

+3 −3
Original line number Diff line number Diff line
@@ -40,7 +40,7 @@ 
#include <linux/tcp.h>

#include <linux/net_tstamp.h>

#include <linux/ptp_clock_kernel.h>

#include <linux/tick.h>

#include <linux/sched/isolation.h>



#include <asm/checksum.h>

#include <asm/homecache.h>
@@ -2270,8 +2270,8 @@ static int __init tile_net_init_module(void) 
		tile_net_dev_init(name, mac);



	if (!network_cpus_init())

		cpumask_and(&network_cpus_map, housekeeping_cpumask(),

			    cpu_online_mask);

		cpumask_and(&network_cpus_map,

			    housekeeping_cpumask(HK_FLAG_MISC), cpu_online_mask);



	return 0;

}

fs/proc/array.c

+1 −1
Original line number Diff line number Diff line
@@ -138,7 +138,7 @@ static const char * const task_state_array[] = { 
static inline const char *get_task_state(struct task_struct *tsk)

{

	BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));

	return task_state_array[__get_task_state(tsk)];

	return task_state_array[task_state_index(tsk)];

}



static inline int get_task_umask(struct task_struct *tsk)

include/linux/cpumask.h

+16 −0
Original line number Diff line number Diff line
@@ -131,6 +131,11 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp) 
	return 0;

}



static inline unsigned int cpumask_last(const struct cpumask *srcp)

{

	return 0;

}



/* Valid inputs for n are -1 and 0. */

static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)

{
@@ -179,6 +184,17 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp) 
	return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);

}



/**

 * cpumask_last - get the last CPU in a cpumask

 * @srcp:	- the cpumask pointer

 *

 * Returns	>= nr_cpumask_bits if no CPUs set.

 */

static inline unsigned int cpumask_last(const struct cpumask *srcp)

{

	return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);

}



unsigned int cpumask_next(int n, const struct cpumask *srcp);



/**