b4fee475f8
When tasks move across cpusets, the current affinity settings are lost. Cache the task affinity and restore it during cpuset migration. The restoring happens only when the cached affinity is subset of the current cpuset settings. Change-Id: I6c2ec1d5e3d994e176926d94b9e0cc92418020cc Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
193 lines
5.2 KiB
C
193 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/init_task.h>
|
|
#include <linux/export.h>
|
|
#include <linux/mqueue.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/sysctl.h>
|
|
#include <linux/sched/rt.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/audit.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
static struct signal_struct init_signals = {
|
|
.nr_threads = 1,
|
|
.thread_head = LIST_HEAD_INIT(init_task.thread_node),
|
|
.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
|
|
.shared_pending = {
|
|
.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
|
|
.signal = {{0}}
|
|
},
|
|
.multiprocess = HLIST_HEAD_INIT,
|
|
.rlim = INIT_RLIMITS,
|
|
.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
|
|
#ifdef CONFIG_POSIX_TIMERS
|
|
.posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
|
|
.cputimer = {
|
|
.cputime_atomic = INIT_CPUTIME_ATOMIC,
|
|
.running = false,
|
|
.checking_timer = false,
|
|
},
|
|
#endif
|
|
INIT_CPU_TIMERS(init_signals)
|
|
.pids = {
|
|
[PIDTYPE_PID] = &init_struct_pid,
|
|
[PIDTYPE_TGID] = &init_struct_pid,
|
|
[PIDTYPE_PGID] = &init_struct_pid,
|
|
[PIDTYPE_SID] = &init_struct_pid,
|
|
},
|
|
INIT_PREV_CPUTIME(init_signals)
|
|
};
|
|
|
|
static struct sighand_struct init_sighand = {
|
|
.count = ATOMIC_INIT(1),
|
|
.action = { { { .sa_handler = SIG_DFL, } }, },
|
|
.siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
|
|
.signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
|
|
};
|
|
|
|
/*
|
|
* Set up the first task table, touch at your own risk!. Base=0,
|
|
* limit=0x1fffff (=2MB)
|
|
*/
|
|
struct task_struct init_task
|
|
#ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
|
|
__init_task_data
|
|
#endif
|
|
= {
|
|
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
|
.thread_info = INIT_THREAD_INFO(init_task),
|
|
.stack_refcount = ATOMIC_INIT(1),
|
|
#endif
|
|
.state = 0,
|
|
.stack = init_stack,
|
|
.usage = ATOMIC_INIT(2),
|
|
.flags = PF_KTHREAD,
|
|
.prio = MAX_PRIO - 20,
|
|
.static_prio = MAX_PRIO - 20,
|
|
.normal_prio = MAX_PRIO - 20,
|
|
.policy = SCHED_NORMAL,
|
|
.cpus_allowed = CPU_MASK_ALL,
|
|
.nr_cpus_allowed= NR_CPUS,
|
|
.cpus_requested = CPU_MASK_ALL,
|
|
.mm = NULL,
|
|
.active_mm = &init_mm,
|
|
.restart_block = {
|
|
.fn = do_no_restart_syscall,
|
|
},
|
|
.se = {
|
|
.group_node = LIST_HEAD_INIT(init_task.se.group_node),
|
|
},
|
|
.rt = {
|
|
.run_list = LIST_HEAD_INIT(init_task.rt.run_list),
|
|
.time_slice = RR_TIMESLICE,
|
|
},
|
|
.tasks = LIST_HEAD_INIT(init_task.tasks),
|
|
#ifdef CONFIG_SMP
|
|
.pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
|
|
#endif
|
|
#ifdef CONFIG_CGROUP_SCHED
|
|
.sched_task_group = &root_task_group,
|
|
#endif
|
|
.ptraced = LIST_HEAD_INIT(init_task.ptraced),
|
|
.ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
|
|
.real_parent = &init_task,
|
|
.parent = &init_task,
|
|
.children = LIST_HEAD_INIT(init_task.children),
|
|
.sibling = LIST_HEAD_INIT(init_task.sibling),
|
|
.group_leader = &init_task,
|
|
RCU_POINTER_INITIALIZER(real_cred, &init_cred),
|
|
RCU_POINTER_INITIALIZER(cred, &init_cred),
|
|
.comm = INIT_TASK_COMM,
|
|
.thread = INIT_THREAD,
|
|
.fs = &init_fs,
|
|
.files = &init_files,
|
|
.signal = &init_signals,
|
|
.sighand = &init_sighand,
|
|
.nsproxy = &init_nsproxy,
|
|
.pending = {
|
|
.list = LIST_HEAD_INIT(init_task.pending.list),
|
|
.signal = {{0}}
|
|
},
|
|
.blocked = {{0}},
|
|
.alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
|
|
.journal_info = NULL,
|
|
INIT_CPU_TIMERS(init_task)
|
|
.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
|
|
.timer_slack_ns = 50000, /* 50 usec default slack */
|
|
.thread_pid = &init_struct_pid,
|
|
.thread_group = LIST_HEAD_INIT(init_task.thread_group),
|
|
.thread_node = LIST_HEAD_INIT(init_signals.thread_head),
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
.loginuid = INVALID_UID,
|
|
.sessionid = AUDIT_SID_UNSET,
|
|
#endif
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
|
|
.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
|
|
#endif
|
|
#ifdef CONFIG_PREEMPT_RCU
|
|
.rcu_read_lock_nesting = 0,
|
|
.rcu_read_unlock_special.s = 0,
|
|
.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
|
|
.rcu_blocked_node = NULL,
|
|
#endif
|
|
#ifdef CONFIG_TASKS_RCU
|
|
.rcu_tasks_holdout = false,
|
|
.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
|
|
.rcu_tasks_idle_cpu = -1,
|
|
#endif
|
|
#ifdef CONFIG_CPUSETS
|
|
.mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
|
|
#endif
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
.pi_waiters = RB_ROOT_CACHED,
|
|
.pi_top_task = NULL,
|
|
#endif
|
|
INIT_PREV_CPUTIME(init_task)
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
|
|
.vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
|
|
.vtime.starttime = 0,
|
|
.vtime.state = VTIME_SYS,
|
|
#endif
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
.numa_preferred_nid = -1,
|
|
.numa_group = NULL,
|
|
.numa_faults = NULL,
|
|
#endif
|
|
#ifdef CONFIG_KASAN
|
|
.kasan_depth = 1,
|
|
#endif
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
.softirqs_enabled = 1,
|
|
#endif
|
|
#ifdef CONFIG_LOCKDEP
|
|
.lockdep_recursion = 0,
|
|
#endif
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
.ret_stack = NULL,
|
|
#endif
|
|
#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
|
|
.trace_recursion = 0,
|
|
#endif
|
|
#ifdef CONFIG_LIVEPATCH
|
|
.patch_state = KLP_UNDEFINED,
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
.security = NULL,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL(init_task);
|
|
|
|
/*
|
|
* Initial thread structure. Alignment of this is handled by a special
|
|
* linker map entry.
|
|
*/
|
|
#ifndef CONFIG_THREAD_INFO_IN_TASK
|
|
struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
|
|
#endif
|