More X86-64 boot options can be found in
Documentation/x86/x86_64/boot-options.txt .
X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
+ X86_UV SGI UV support is enabled.
XEN Xen support is enabled
In addition, the following text indicates that the option:
acpi= [HW,ACPI,X86,ARM64]
Advanced Configuration and Power Interface
- Format: { force | off | strict | noirq | rsdt |
+ Format: { force | on | off | strict | noirq | rsdt |
copy_dsdt }
force -- enable ACPI if default was off
+ on -- enable ACPI but allow fallback to DT [arm64]
off -- disable ACPI if default was on
noirq -- do not use ACPI for IRQ routing
strict -- Be less tolerant of platforms that are not
strictly ACPI specification compliant.
rsdt -- prefer RSDT over (default) XSDT
copy_dsdt -- copy DSDT to memory
- For ARM64, ONLY "acpi=off" or "acpi=force" are available
+ For ARM64, ONLY "acpi=off", "acpi=on" or "acpi=force"
+ are available
See also Documentation/power/runtime_pm.txt, pci=noacpi
Format: <int> (must be >=0)
Default: 64
+ bau= [X86_UV] Enable the BAU on SGI UV. The default
+ behavior is to disable the BAU (i.e. bau=0).
+ Format: { "0" | "1" }
+ 0 - Disable the BAU.
+ 1 - Enable the BAU.
+ unset - Disable the BAU.
+
baycom_epp= [HW,AX25]
Format: <io>,<mode>
hwp_only
Only load intel_pstate on systems which support
hardware P state control (HWP) if available.
+ support_acpi_ppc
+ Enforce ACPI _PPC performance limits. If the Fixed ACPI
+ Description Table, specifies preferred power management
+ profile as "Enterprise Server" or "Performance Server",
+ then this feature is turned on by default.
intremap= [X86-64, Intel-IOMMU]
on enable Interrupt Remapping (default)
Lazy RCU callbacks are those which RCU can
prove do nothing more than free memory.
+ rcuperf.gp_exp= [KNL]
+ Measure performance of expedited synchronous
+ grace-period primitives.
+
+ rcuperf.holdoff= [KNL]
+ Set test-start holdoff period. The purpose of
+ this parameter is to delay the start of the
+ test until boot completes in order to avoid
+ interference.
+
+ rcuperf.nreaders= [KNL]
+ Set number of RCU readers. The value -1 selects
+ N, where N is the number of CPUs. A value
+ "n" less than -1 selects N-n+1, where N is again
+ the number of CPUs. For example, -2 selects N
+ (the number of CPUs), -3 selects N+1, and so on.
+ A value of "n" less than or equal to -N selects
+ a single reader.
+
+ rcuperf.nwriters= [KNL]
+ Set number of RCU writers. The values operate
+ the same as for rcuperf.nreaders.
+ N, where N is the number of CPUs
+
+ rcuperf.perf_runnable= [BOOT]
+ Start rcuperf running at boot time.
+
+ rcuperf.shutdown= [KNL]
+ Shut the system down after performance tests
+ complete. This is useful for hands-off automated
+ testing.
+
+ rcuperf.perf_type= [KNL]
+ Specify the RCU implementation to test.
+
+ rcuperf.verbose= [KNL]
+ Enable additional printk() statements.
+
rcutorture.cbflood_inter_holdoff= [KNL]
Set holdoff time (jiffies) between successive
callback-flood tests.
F: arch/arm/boot/dts/armada*
F: arch/arm/boot/dts/kirkwood*
F: arch/arm64/boot/dts/marvell/armada*
+ F: drivers/cpufreq/mvebu-cpufreq.c
ARM/Marvell Berlin SoC support
F: include/linux/devfreq-event.h
F: Documentation/devicetree/bindings/devfreq/event/
+ BUS FREQUENCY DRIVER FOR SAMSUNG EXYNOS
+ M: Chanwoo Choi <cw00.choi@samsung.com>
+ L: linux-pm@vger.kernel.org
+ L: linux-samsung-soc@vger.kernel.org
+ T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
+ S: Maintained
+ F: drivers/devfreq/exynos-bus.c
+ F: Documentation/devicetree/bindings/devfreq/exynos-bus.txt
+
DEVICE NUMBER REGISTRY
M: Torben Mathiasen <device@lanana.org>
W: http://lanana.org/docs/device-list/index.html
M: Krzysztof Kozlowski <k.kozlowski@samsung.com>
L: linux-kernel@vger.kernel.org
S: Supported
-F: drivers/*/max14577.c
+F: drivers/*/max14577*.c
F: drivers/*/max77686*.c
-F: drivers/*/max77693.c
+F: drivers/*/max77693*.c
F: drivers/extcon/extcon-max14577.c
F: drivers/extcon/extcon-max77693.c
F: drivers/rtc/rtc-max77686.c
F: drivers/media/i2c/tc358743*
F: include/media/i2c/tc358743.h
-TMIO MMC DRIVER
-M: Ian Molton <ian@mnementh.co.uk>
+TMIO/SDHI MMC DRIVER
+M: Wolfram Sang <wsa+renesas@sang-engineering.com>
L: linux-mmc@vger.kernel.org
-S: Maintained
+S: Supported
F: drivers/mmc/host/tmio_mmc*
F: drivers/mmc/host/sh_mobile_sdhi.c
-F: include/linux/mmc/tmio.h
-F: include/linux/mmc/sh_mobile_sdhi.h
+F: include/linux/mfd/tmio.h
TMP401 HARDWARE MONITOR DRIVER
M: Guenter Roeck <linux@roeck-us.net>
F: kernel/trace/
F: tools/testing/selftests/ftrace/
+TRACING MMIO ACCESSES (MMIOTRACE)
+M: Steven Rostedt <rostedt@goodmis.org>
+M: Ingo Molnar <mingo@kernel.org>
+R: Karol Herbst <karolherbst@gmail.com>
+R: Pekka Paalanen <ppaalanen@gmail.com>
+S: Maintained
+L: linux-kernel@vger.kernel.org
+L: nouveau@lists.freedesktop.org
+F: kernel/trace/trace_mmiotrace.c
+F: include/linux/mmiotrace.h
+F: arch/x86/mm/kmmio.c
+F: arch/x86/mm/mmio-mod.c
+F: arch/x86/mm/testmmiotrace.c
+
TRIVIAL PATCHES
M: Jiri Kosina <trivial@kernel.org>
T: git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial.git
W: http://www.slimlogic.co.uk/?p=48
T: git git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git
S: Supported
+F: Documentation/devicetree/bindings/regulator/
F: drivers/regulator/
+F: include/dt-bindings/regulator/
F: include/linux/regulator/
VRF
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*/
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include "longhaul.h"
- #define PFX "longhaul: "
-
#define TYPE_LONGHAUL_V1 1
#define TYPE_LONGHAUL_V2 2
#define TYPE_POWERSAVER 3
freqs.new = calc_speed(longhaul_get_cpu_mult());
/* Check if requested frequency is set. */
if (unlikely(freqs.new != speed)) {
- printk(KERN_INFO PFX "Failed to set requested frequency!\n");
+ pr_info("Failed to set requested frequency!\n");
/* Revision ID = 1 but processor is expecting revision key
* equal to 0. Jumpers at the bottom of processor will change
* multiplier and FSB, but will not change bits in Longhaul
* MSR nor enable voltage scaling. */
if (!revid_errata) {
- printk(KERN_INFO PFX "Enabling \"Ignore Revision ID\" "
- "option.\n");
+ pr_info("Enabling \"Ignore Revision ID\" option\n");
revid_errata = 1;
msleep(200);
goto retry_loop;
* but it doesn't change frequency. I tried poking various
* bits in northbridge registers, but without success. */
if (longhaul_flags & USE_ACPI_C3) {
- printk(KERN_INFO PFX "Disabling ACPI C3 support.\n");
+ pr_info("Disabling ACPI C3 support\n");
longhaul_flags &= ~USE_ACPI_C3;
if (revid_errata) {
- printk(KERN_INFO PFX "Disabling \"Ignore "
- "Revision ID\" option.\n");
+ pr_info("Disabling \"Ignore Revision ID\" option\n");
revid_errata = 0;
}
msleep(200);
* RevID = 1. RevID errata will make things right. Just
* to be 100% sure. */
if (longhaul_version == TYPE_LONGHAUL_V2) {
- printk(KERN_INFO PFX "Switching to Longhaul ver. 1\n");
+ pr_info("Switching to Longhaul ver. 1\n");
longhaul_version = TYPE_LONGHAUL_V1;
msleep(200);
goto retry_loop;
}
if (!bm_timeout) {
- printk(KERN_INFO PFX "Warning: Timeout while waiting for "
- "idle PCI bus.\n");
+ pr_info("Warning: Timeout while waiting for idle PCI bus\n");
return -EBUSY;
}
/* Get current frequency */
mult = longhaul_get_cpu_mult();
if (mult == -1) {
- printk(KERN_INFO PFX "Invalid (reserved) multiplier!\n");
+ pr_info("Invalid (reserved) multiplier!\n");
return -EINVAL;
}
fsb = guess_fsb(mult);
if (fsb == 0) {
- printk(KERN_INFO PFX "Invalid (reserved) FSB!\n");
+ pr_info("Invalid (reserved) FSB!\n");
return -EINVAL;
}
/* Get max multiplier - as we always did.
print_speed(highest_speed/1000));
if (lowest_speed == highest_speed) {
- printk(KERN_INFO PFX "highestspeed == lowest, aborting.\n");
+ pr_info("highestspeed == lowest, aborting\n");
return -EINVAL;
}
if (lowest_speed > highest_speed) {
- printk(KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
+ pr_info("nonsense! lowest (%d > %d) !\n",
lowest_speed, highest_speed);
return -EINVAL;
}
rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
if (!(longhaul.bits.RevisionID & 1)) {
- printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
+ pr_info("Voltage scaling not supported by CPU\n");
return;
}
if (!longhaul.bits.VRMRev) {
- printk(KERN_INFO PFX "VRM 8.5\n");
+ pr_info("VRM 8.5\n");
vrm_mV_table = &vrm85_mV[0];
mV_vrm_table = &mV_vrm85[0];
} else {
- printk(KERN_INFO PFX "Mobile VRM\n");
+ pr_info("Mobile VRM\n");
if (cpu_model < CPU_NEHEMIAH)
return;
vrm_mV_table = &mobilevrm_mV[0];
maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
- printk(KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
- "Voltage scaling disabled.\n",
- minvid.mV/1000, minvid.mV%1000,
- maxvid.mV/1000, maxvid.mV%1000);
+ pr_info("Bogus values Min:%d.%03d Max:%d.%03d - Voltage scaling disabled\n",
+ minvid.mV/1000, minvid.mV%1000,
+ maxvid.mV/1000, maxvid.mV%1000);
return;
}
if (minvid.mV == maxvid.mV) {
- printk(KERN_INFO PFX "Claims to support voltage scaling but "
- "min & max are both %d.%03d. "
- "Voltage scaling disabled\n",
- maxvid.mV/1000, maxvid.mV%1000);
+ pr_info("Claims to support voltage scaling but min & max are both %d.%03d - Voltage scaling disabled\n",
+ maxvid.mV/1000, maxvid.mV%1000);
return;
}
/* How many voltage steps*/
numvscales = maxvid.pos - minvid.pos + 1;
- printk(KERN_INFO PFX
- "Max VID=%d.%03d "
- "Min VID=%d.%03d, "
- "%d possible voltage scales\n",
+ pr_info("Max VID=%d.%03d Min VID=%d.%03d, %d possible voltage scales\n",
maxvid.mV/1000, maxvid.mV%1000,
minvid.mV/1000, minvid.mV%1000,
numvscales);
pos = minvid.pos;
freq_pos->driver_data |= mV_vrm_table[pos] << 8;
vid = vrm_mV_table[mV_vrm_table[pos]];
- printk(KERN_INFO PFX "f: %d kHz, index: %d, vid: %d mV\n",
+ pr_info("f: %d kHz, index: %d, vid: %d mV\n",
speed, (int)(freq_pos - longhaul_table), vid.mV);
}
can_scale_voltage = 1;
- printk(KERN_INFO PFX "Voltage scaling enabled.\n");
+ pr_info("Voltage scaling enabled\n");
}
pci_write_config_byte(dev, reg, pci_cmd);
pci_read_config_byte(dev, reg, &pci_cmd);
if (!(pci_cmd & 1<<7)) {
- printk(KERN_ERR PFX
- "Can't enable access to port 0x22.\n");
+ pr_err("Can't enable access to port 0x22\n");
status = 0;
}
}
if (pci_cmd & 1 << 7) {
pci_read_config_dword(dev, 0x88, &acpi_regs_addr);
acpi_regs_addr &= 0xff00;
- printk(KERN_INFO PFX "ACPI I/O at 0x%x\n",
- acpi_regs_addr);
+ pr_info("ACPI I/O at 0x%x\n", acpi_regs_addr);
}
pci_dev_put(dev);
longhaul_version = TYPE_LONGHAUL_V1;
}
- printk(KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
+ pr_info("VIA %s CPU detected. ", cpuname);
switch (longhaul_version) {
case TYPE_LONGHAUL_V1:
case TYPE_LONGHAUL_V2:
- printk(KERN_CONT "Longhaul v%d supported.\n", longhaul_version);
+ pr_cont("Longhaul v%d supported\n", longhaul_version);
break;
case TYPE_POWERSAVER:
- printk(KERN_CONT "Powersaver supported.\n");
+ pr_cont("Powersaver supported\n");
break;
};
if (!(longhaul_flags & USE_ACPI_C3
|| longhaul_flags & USE_NORTHBRIDGE)
&& ((pr == NULL) || !(pr->flags.bm_control))) {
- printk(KERN_ERR PFX
- "No ACPI support. Unsupported northbridge.\n");
+ pr_err("No ACPI support: Unsupported northbridge\n");
return -ENODEV;
}
if (longhaul_flags & USE_NORTHBRIDGE)
- printk(KERN_INFO PFX "Using northbridge support.\n");
+ pr_info("Using northbridge support\n");
if (longhaul_flags & USE_ACPI_C3)
- printk(KERN_INFO PFX "Using ACPI support.\n");
+ pr_info("Using ACPI support\n");
ret = longhaul_get_ranges();
if (ret != 0)
return -ENODEV;
if (!enable) {
- printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
+ pr_err("Option \"enable\" not set - Aborting\n");
return -ENODEV;
}
#ifdef CONFIG_SMP
if (num_online_cpus() > 1) {
- printk(KERN_ERR PFX "More than 1 CPU detected, "
- "longhaul disabled.\n");
+ pr_err("More than 1 CPU detected, longhaul disabled\n");
return -ENODEV;
}
#endif
#ifdef CONFIG_X86_IO_APIC
- if (cpu_has_apic) {
+ if (boot_cpu_has(X86_FEATURE_APIC)) {
- printk(KERN_ERR PFX "APIC detected. Longhaul is currently "
- "broken in this configuration.\n");
+ pr_err("APIC detected. Longhaul is currently broken in this configuration.\n");
return -ENODEV;
}
#endif
case 6 ... 9:
return cpufreq_register_driver(&longhaul_driver);
case 10:
- printk(KERN_ERR PFX "Use acpi-cpufreq driver for VIA C7\n");
+ pr_err("Use acpi-cpufreq driver for VIA C7\n");
default:
;
}
#include <asm/processor.h>
#include <asm/cpu_device_id.h>
+/* Local defines */
+#define MSR_PLATFORM_POWER_LIMIT 0x0000065C
+
/* bitmasks for RAPL MSRs, used by primitive access functions */
#define ENERGY_STATUS_MASK 0xffffffff
RAPL_DOMAIN_PP0, /* core power plane */
RAPL_DOMAIN_PP1, /* graphics uncore */
RAPL_DOMAIN_DRAM,/* DRAM control_type */
+ RAPL_DOMAIN_PLATFORM, /* PSys control_type */
RAPL_DOMAIN_MAX,
};
"core",
"uncore",
"dram",
+ "psys",
};
static struct powercap_control_type *control_type; /* PowerCap Controller */
+static struct rapl_domain *platform_rapl_domain; /* Platform (PSys) domain */
/* caller to ensure CPU hotplug lock is held */
static struct rapl_package *find_package_by_id(int id)
.set_enable = set_domain_enable,
.get_enable = get_domain_enable,
},
+ /* RAPL_DOMAIN_PLATFORM */
+ {
+ .get_energy_uj = get_energy_counter,
+ .get_max_energy_range_uj = get_max_energy_counter,
+ .release = release_zone,
+ .set_enable = set_domain_enable,
+ .get_enable = get_domain_enable,
+ },
};
static int set_power_limit(struct powercap_zone *power_zone, int id,
RAPL_CPU(0X5C, rapl_defaults_core),/* Broxton */
RAPL_CPU(0x5E, rapl_defaults_core),/* Skylake-H/S */
RAPL_CPU(0x57, rapl_defaults_hsw_server),/* Knights Landing */
+ RAPL_CPU(0x8E, rapl_defaults_core),/* Kabylake */
+ RAPL_CPU(0x9E, rapl_defaults_core),/* Kabylake */
{}
};
MODULE_DEVICE_TABLE(x86cpu, rapl_ids);
powercap_unregister_zone(control_type,
&rd_package->power_zone);
}
+
+ if (platform_rapl_domain) {
+ powercap_unregister_zone(control_type,
+ &platform_rapl_domain->power_zone);
+ kfree(platform_rapl_domain);
+ }
+
powercap_unregister_control_type(control_type);
return 0;
return ret;
}
+static int rapl_register_psys(void)
+{
+ struct rapl_domain *rd;
+ struct powercap_zone *power_zone;
+ u64 val;
+
+ if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_ENERGY_STATUS, &val) || !val)
+ return -ENODEV;
+
+ if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_POWER_LIMIT, &val) || !val)
+ return -ENODEV;
+
+ rd = kzalloc(sizeof(*rd), GFP_KERNEL);
+ if (!rd)
+ return -ENOMEM;
+
+ rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
+ rd->id = RAPL_DOMAIN_PLATFORM;
+ rd->msrs[0] = MSR_PLATFORM_POWER_LIMIT;
+ rd->msrs[1] = MSR_PLATFORM_ENERGY_STATUS;
+ rd->rpl[0].prim_id = PL1_ENABLE;
+ rd->rpl[0].name = pl1_name;
+ rd->rpl[1].prim_id = PL2_ENABLE;
+ rd->rpl[1].name = pl2_name;
+ rd->rp = find_package_by_id(0);
+
+ power_zone = powercap_register_zone(&rd->power_zone, control_type,
+ "psys", NULL,
+ &zone_ops[RAPL_DOMAIN_PLATFORM],
+ 2, &constraint_ops);
+
+ if (IS_ERR(power_zone)) {
+ kfree(rd);
+ return PTR_ERR(power_zone);
+ }
+
+ platform_rapl_domain = rd;
+
+ return 0;
+}
+
static int rapl_register_powercap(void)
{
struct rapl_domain *rd;
list_for_each_entry(rp, &rapl_packages, plist)
if (rapl_package_register_powercap(rp))
goto err_cleanup_package;
+
+ /* Don't bail out if PSys is not supported */
+ rapl_register_psys();
+
return ret;
err_cleanup_package:
case RAPL_DOMAIN_DRAM:
msr = MSR_DRAM_ENERGY_STATUS;
break;
+ case RAPL_DOMAIN_PLATFORM:
+ /* PSYS(PLATFORM) is not a CPU domain, so avoid printng error */
+ return -EINVAL;
default:
pr_err("invalid domain id %d\n", domain);
return -EINVAL;
#include <linux/pid.h>
#include <linux/percpu.h>
#include <linux/topology.h>
-#include <linux/proportions.h>
#include <linux/seccomp.h>
#include <linux/rcupdate.h>
#include <linux/rculist.h>
extern void calc_global_load(unsigned long ticks);
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
-extern void update_cpu_load_nohz(int active);
+extern void cpu_load_update_nohz_start(void);
+extern void cpu_load_update_nohz_stop(void);
#else
-static inline void update_cpu_load_nohz(int active) { }
+static inline void cpu_load_update_nohz_start(void) { }
+static inline void cpu_load_update_nohz_stop(void) { }
#endif
extern void dump_cpu_task(int cpu);
extern void trap_init(void);
extern void update_process_times(int user);
extern void scheduler_tick(void);
+extern int sched_cpu_starting(unsigned int cpu);
+extern int sched_cpu_activate(unsigned int cpu);
+extern int sched_cpu_deactivate(unsigned int cpu);
+
+#ifdef CONFIG_HOTPLUG_CPU
+extern int sched_cpu_dying(unsigned int cpu);
+#else
+# define sched_cpu_dying NULL
+#endif
extern void sched_show_task(struct task_struct *p);
CPU_MAX_IDLE_TYPES
};
+/*
+ * Integer metrics need fixed point arithmetic, e.g., sched/fair
+ * has a few: load, load_avg, util_avg, freq, and capacity.
+ *
+ * We define a basic fixed point arithmetic range, and then formalize
+ * all these metrics based on that basic range.
+ */
+# define SCHED_FIXEDPOINT_SHIFT 10
+# define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
+
/*
* Increase resolution of cpu_capacity calculations
*/
-#define SCHED_CAPACITY_SHIFT 10
+#define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
#define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
/*
};
/*
- * The load_avg/util_avg accumulates an infinite geometric series.
- * 1) load_avg factors frequency scaling into the amount of time that a
- * sched_entity is runnable on a rq into its weight. For cfs_rq, it is the
- * aggregated such weights of all runnable and blocked sched_entities.
- * 2) util_avg factors frequency and cpu scaling into the amount of time
- * that a sched_entity is running on a CPU, in the range [0..SCHED_LOAD_SCALE].
- * For cfs_rq, it is the aggregated such times of all runnable and
+ * The load_avg/util_avg accumulates an infinite geometric series
+ * (see __update_load_avg() in kernel/sched/fair.c).
+ *
+ * [load_avg definition]
+ *
+ * load_avg = runnable% * scale_load_down(load)
+ *
+ * where runnable% is the time ratio that a sched_entity is runnable.
+ * For cfs_rq, it is the aggregated load_avg of all runnable and
* blocked sched_entities.
- * The 64 bit load_sum can:
- * 1) for cfs_rq, afford 4353082796 (=2^64/47742/88761) entities with
- * the highest weight (=88761) always runnable, we should not overflow
- * 2) for entity, support any load.weight always runnable
+ *
+ * load_avg may also take frequency scaling into account:
+ *
+ * load_avg = runnable% * scale_load_down(load) * freq%
+ *
+ * where freq% is the CPU frequency normalized to the highest frequency.
+ *
+ * [util_avg definition]
+ *
+ * util_avg = running% * SCHED_CAPACITY_SCALE
+ *
+ * where running% is the time ratio that a sched_entity is running on
+ * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
+ * and blocked sched_entities.
+ *
+ * util_avg may also factor frequency scaling and CPU capacity scaling:
+ *
+ * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
+ *
+ * where freq% is the same as above, and capacity% is the CPU capacity
+ * normalized to the greatest capacity (due to uarch differences, etc).
+ *
+ * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
+ * themselves are in the range of [0, 1]. To do fixed point arithmetics,
+ * we therefore scale them to as large a range as necessary. This is for
+ * example reflected by util_avg's SCHED_CAPACITY_SCALE.
+ *
+ * [Overflow issue]
+ *
+ * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
+ * with the highest load (=88761), always runnable on a single cfs_rq,
+ * and should not overflow as the number already hits PID_MAX_LIMIT.
+ *
+ * For all other cases (including 32-bit kernels), struct load_weight's
+ * weight will overflow first before we do, because:
+ *
+ * Max(load_avg) <= Max(load.weight)
+ *
+ * Then it is the load_weight's responsibility to consider overflow
+ * issues.
*/
struct sched_avg {
u64 last_update_time, load_sum;
unsigned long sas_ss_sp;
size_t sas_ss_size;
+ unsigned sas_ss_flags;
struct callback_head *task_works;
/* Future-safe accessor for struct task_struct's cpus_allowed. */
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
+static inline int tsk_nr_cpus_allowed(struct task_struct *p)
+{
+ return p->nr_cpus_allowed;
+}
+
#define TNF_MIGRATED 0x01
#define TNF_NO_GROUP 0x02
#define TNF_SHARED 0x04
/*
* See the comment in kernel/sched/clock.c
*/
-extern u64 cpu_clock(int cpu);
-extern u64 local_clock(void);
extern u64 running_clock(void);
extern u64 sched_clock_cpu(int cpu);
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
{
}
+
+static inline u64 cpu_clock(int cpu)
+{
+ return sched_clock();
+}
+
+static inline u64 local_clock(void)
+{
+ return sched_clock();
+}
#else
/*
* Architectures can set this to 1 if they have specified
extern void sched_clock_tick(void);
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
+
+/*
+ * As outlined in clock.c, provides a fast, high resolution, nanosecond
+ * time source that is monotonic per cpu argument and has bounded drift
+ * between cpus.
+ *
+ * ######################### BIG FAT WARNING ##########################
+ * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
+ * # go backwards !! #
+ * ####################################################################
+ */
+static inline u64 cpu_clock(int cpu)
+{
+ return sched_clock_cpu(cpu);
+}
+
+static inline u64 local_clock(void)
+{
+ return sched_clock_cpu(raw_smp_processor_id());
+}
#endif
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
*/
static inline int on_sig_stack(unsigned long sp)
{
+ /*
+ * If the signal stack is SS_AUTODISARM then, by construction, we
+ * can't be on the signal stack unless user code deliberately set
+ * SS_AUTODISARM when we were already on it.
+ *
+ * This improves reliability: if user state gets corrupted such that
+ * the stack pointer points very close to the end of the signal stack,
+ * then this check will enable the signal to be handled anyway.
+ */
+ if (current->sas_ss_flags & SS_AUTODISARM)
+ return 0;
+
#ifdef CONFIG_STACK_GROWSUP
return sp >= current->sas_ss_sp &&
sp - current->sas_ss_sp < current->sas_ss_size;
return on_sig_stack(sp) ? SS_ONSTACK : 0;
}
+static inline void sas_ss_reset(struct task_struct *p)
+{
+ p->sas_ss_sp = 0;
+ p->sas_ss_size = 0;
+ p->sas_ss_flags = SS_DISABLE;
+}
+
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
{
if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
u64 time, unsigned long util, unsigned long max);
};
- void cpufreq_set_update_util_data(int cpu, struct update_util_data *data);
+ void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data,
+ void (*func)(struct update_util_data *data, u64 time,
+ unsigned long util, unsigned long max));
+ void cpufreq_remove_update_util_hook(int cpu);
#endif /* CONFIG_CPU_FREQ */
#endif
extern long calc_load_fold_active(struct rq *this_rq);
#ifdef CONFIG_SMP
-extern void update_cpu_load_active(struct rq *this_rq);
+extern void cpu_load_update_active(struct rq *this_rq);
#else
-static inline void update_cpu_load_active(struct rq *this_rq) { }
+static inline void cpu_load_update_active(struct rq *this_rq) { }
#endif
/*
* and does not change the user-interface for setting shares/weights.
*
* We increase resolution only if we have enough bits to allow this increased
- * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
- * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
- * increased costs.
+ * resolution (i.e. 64bit). The costs for increasing resolution when 32bit are
+ * pretty high and the returns do not justify the increased costs.
+ *
+ * Really only required when CONFIG_FAIR_GROUP_SCHED is also set, but to
+ * increase coverage and consistency always enable it on 64bit platforms.
*/
-#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
-# define SCHED_LOAD_RESOLUTION 10
-# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
-# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
+#ifdef CONFIG_64BIT
+# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
+# define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
+# define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT)
#else
-# define SCHED_LOAD_RESOLUTION 0
+# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
# define scale_load(w) (w)
# define scale_load_down(w) (w)
#endif
-#define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
-#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
-
-#define NICE_0_LOAD SCHED_LOAD_SCALE
-#define NICE_0_SHIFT SCHED_LOAD_SHIFT
+/*
+ * Task weight (visible to users) and its load (invisible to users) have
+ * independent resolution, but they should be well calibrated. We use
+ * scale_load() and scale_load_down(w) to convert between them. The
+ * following must be true:
+ *
+ * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD
+ *
+ */
+#define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
/*
* Single value that decides SCHED_DEADLINE internal math precision.
#endif
#define CPU_LOAD_IDX_MAX 5
unsigned long cpu_load[CPU_LOAD_IDX_MAX];
- unsigned long last_load_update_tick;
#ifdef CONFIG_NO_HZ_COMMON
+#ifdef CONFIG_SMP
+ unsigned long last_load_update_tick;
+#endif /* CONFIG_SMP */
u64 nohz_stamp;
unsigned long nohz_flags;
-#endif
+#endif /* CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_NO_HZ_FULL
unsigned long last_sched_tick;
#endif
struct sched_group_capacity {
atomic_t ref;
/*
- * CPU capacity of this group, SCHED_LOAD_SCALE being max capacity
+ * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
* for a single CPU.
*/
unsigned int capacity;
*
* ENQUEUE_HEAD - place at front of runqueue (tail if not specified)
* ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
- * ENQUEUE_WAKING - sched_class::task_waking was called
+ * ENQUEUE_MIGRATED - the task was migrated during wakeup
*
*/
#define ENQUEUE_HEAD 0x08
#define ENQUEUE_REPLENISH 0x10
#ifdef CONFIG_SMP
-#define ENQUEUE_WAKING 0x20
+#define ENQUEUE_MIGRATED 0x20
#else
-#define ENQUEUE_WAKING 0x00
+#define ENQUEUE_MIGRATED 0x00
#endif
#define RETRY_TASK ((void *)-1UL)
* tasks.
*/
struct task_struct * (*pick_next_task) (struct rq *rq,
- struct task_struct *prev);
+ struct task_struct *prev,
+ struct pin_cookie cookie);
void (*put_prev_task) (struct rq *rq, struct task_struct *p);
#ifdef CONFIG_SMP
int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags);
void (*migrate_task_rq)(struct task_struct *p);
- void (*task_waking) (struct task_struct *task);
void (*task_woken) (struct rq *this_rq, struct task_struct *task);
void (*set_cpus_allowed)(struct task_struct *p,
unsigned long to_ratio(u64 period, u64 runtime);
extern void init_entity_runnable_average(struct sched_entity *se);
+extern void post_init_entity_util_avg(struct sched_entity *se);
#ifdef CONFIG_NO_HZ_FULL
extern bool sched_can_stop_tick(struct rq *rq);
static inline void sched_avg_update(struct rq *rq) { }
#endif
-/*
- * __task_rq_lock - lock the rq @p resides on.
- */
-static inline struct rq *__task_rq_lock(struct task_struct *p)
- __acquires(rq->lock)
-{
- struct rq *rq;
-
- lockdep_assert_held(&p->pi_lock);
-
- for (;;) {
- rq = task_rq(p);
- raw_spin_lock(&rq->lock);
- if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
- lockdep_pin_lock(&rq->lock);
- return rq;
- }
- raw_spin_unlock(&rq->lock);
-
- while (unlikely(task_on_rq_migrating(p)))
- cpu_relax();
- }
-}
+struct rq_flags {
+ unsigned long flags;
+ struct pin_cookie cookie;
+};
-/*
- * task_rq_lock - lock p->pi_lock and lock the rq @p resides on.
- */
-static inline struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
+struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
+ __acquires(rq->lock);
+struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(p->pi_lock)
- __acquires(rq->lock)
-{
- struct rq *rq;
-
- for (;;) {
- raw_spin_lock_irqsave(&p->pi_lock, *flags);
- rq = task_rq(p);
- raw_spin_lock(&rq->lock);
- /*
- * move_queued_task() task_rq_lock()
- *
- * ACQUIRE (rq->lock)
- * [S] ->on_rq = MIGRATING [L] rq = task_rq()
- * WMB (__set_task_cpu()) ACQUIRE (rq->lock);
- * [S] ->cpu = new_cpu [L] task_rq()
- * [L] ->on_rq
- * RELEASE (rq->lock)
- *
- * If we observe the old cpu in task_rq_lock, the acquire of
- * the old rq->lock will fully serialize against the stores.
- *
- * If we observe the new cpu in task_rq_lock, the acquire will
- * pair with the WMB to ensure we must then also see migrating.
- */
- if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
- lockdep_pin_lock(&rq->lock);
- return rq;
- }
- raw_spin_unlock(&rq->lock);
- raw_spin_unlock_irqrestore(&p->pi_lock, *flags);
-
- while (unlikely(task_on_rq_migrating(p)))
- cpu_relax();
- }
-}
+ __acquires(rq->lock);
-static inline void __task_rq_unlock(struct rq *rq)
+static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
- lockdep_unpin_lock(&rq->lock);
+ lockdep_unpin_lock(&rq->lock, rf->cookie);
raw_spin_unlock(&rq->lock);
}
static inline void
-task_rq_unlock(struct rq *rq, struct task_struct *p, unsigned long *flags)
+task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(rq->lock)
__releases(p->pi_lock)
{
- lockdep_unpin_lock(&rq->lock);
+ lockdep_unpin_lock(&rq->lock, rf->cookie);
raw_spin_unlock(&rq->lock);
- raw_spin_unlock_irqrestore(&p->pi_lock, *flags);
+ raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}
#ifdef CONFIG_SMP
};
#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
+
+extern void nohz_balance_exit_idle(unsigned int cpu);
+#else
+static inline void nohz_balance_exit_idle(unsigned int cpu) { }
#endif
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
static inline void cpufreq_trigger_update(u64 time) {}
#endif /* CONFIG_CPU_FREQ */
+ #ifdef arch_scale_freq_capacity
+ #ifndef arch_scale_freq_invariant
+ #define arch_scale_freq_invariant() (true)
+ #endif
+ #else /* arch_scale_freq_capacity */
+ #define arch_scale_freq_invariant() (false)
+ #endif
+
static inline void account_reset_rq(struct rq *rq)
{
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
projects / linux-2.6-block.git / commitdiff