linux下task_struct结构体的位置及内容
夏建木
首先我们要知道这个结构体的定义位置是在内核中的sched.h中。
而不是很多博客说的usr子文件夹下，这里附上地址：
/usr/src/kernels/3.10.0-514.21.1.el7.x86_64/include/linux
（3.10.0-514.21.1.el7.x86_64是内核版本，根据大家自己的电脑进行查看， 因为这个文件夹只有一个，所以也不用刻意去分辨）
要查看内容可直接用vim打开，使用“/task_struct”进行查询，“n”键搜索下一个
内容：
struct task_struct {
1258 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1259 void *stack;
1260 atomic_t usage;
1261 unsigned int flags; /* per process flags, defined below */
1262 unsigned int ptrace;
1263
1264 #ifdef CONFIG_SMP
1265 struct llist_node wake_entry;
1266 int on_cpu;
1267 struct task_struct *last_wakee;
1268 unsigned long wakee_flips;
1269 unsigned long wakee_flip_decay_ts;
1270
1271 int wake_cpu;
1272 #endif
1273 int on_rq;
1274
1275 int prio, static_prio, normal_prio;
1276 unsigned int rt_priority;
1277 const struct sched_class *sched_class;
1278 struct sched_entity se;
1279 struct sched_rt_entity rt;
1280 #ifdef CONFIG_CGROUP_SCHED
1281 struct task_group *sched_task_group;
1282 #endif
1283 #ifdef CONFIG_PREEMPT_NOTIFIERS
1284 /* list of struct preempt_notifier: */
1285 struct hlist_head preempt_notifiers;
1286 #endif
1287
1288 /*
1289 * fpu_counter contains the number of consecutive context switches
1290 * that the FPU is used. If this is over a threshold, the lazy fpu
1291 * saving becomes unlazy to save the trap. This is an unsigned char
1292 * so that after 256 times the counter wraps and the behavior turns
1293 * lazy again; this to deal with bursty apps that only use FPU for
1294 * a short time
1295 */
1296 unsigned char fpu_counter;
1297 #ifdef CONFIG_BLK_DEV_IO_TRACE
1298 unsigned int btrace_seq;
1299 #endif
1300
1301 unsigned int policy;
1302 int nr_cpus_allowed;
1303 cpumask_t cpus_allowed;
1304
1305 #ifdef CONFIG_PREEMPT_RCU
1306 int rcu_read_lock_nesting;
1307 char rcu_read_unlock_special;
1308 struct list_head rcu_node_entry;
1309 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1310 #ifdef CONFIG_TREE_PREEMPT_RCU
1311 struct rcu_node *rcu_blocked_node;
1312 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1313 #ifdef CONFIG_RCU_BOOST
1314 struct rt_mutex *rcu_boost_mutex;
1315 #endif /* #ifdef CONFIG_RCU_BOOST */
1316
1317 #ifdef CONFIG_SCHED_INFO
1318 struct sched_info sched_info;
1319 #endif
1320
1321 struct list_head tasks;
1322 #ifdef CONFIG_SMP
1323 struct plist_node pushable_tasks;
1324 #endif
1325
1326 struct mm_struct *mm, *active_mm;
1327 #ifdef CONFIG_COMPAT_BRK
1328 unsigned brk_randomized:1;
1329 #endif
1330 #if defined(SPLIT_RSS_COUNTING)
1331 struct task_rss_stat rss_stat;
1332 #endif
1333 /* task state */
1334 int exit_state;
1335 int exit_code, exit_signal;
1336 int pdeath_signal; /* The signal sent when the parent dies */
1337 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1338
1339 /* Used for emulating ABI behavior of previous Linux versions */
1340 unsigned int personality;
1341
1342 unsigned did_exec:1;
1343 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1344 * execve */
1345 unsigned in_iowait:1;
1346
1347 /* task may not gain privileges */
1348 unsigned no_new_privs:1;
1349
1350 /* Revert to default priority/policy when forking */
1351 unsigned sched_reset_on_fork:1;
1352 unsigned sched_contributes_to_load:1;
1353
1354 pid_t pid;
1355 pid_t tgid;
1356
1357 #ifdef CONFIG_CC_STACKPROTECTOR
1358 /* Canary value for the -fstack-protector gcc feature */
1359 unsigned long stack_canary;
1360 #endif
1361 /*
1362 * pointers to (original) parent process, youngest child, younger sibling,
1363 * older sibling, respectively. (p->father can be replaced with
1364 * p->real_parent->pid)
1365 */
1366 struct task_struct __rcu *real_parent; /* real parent process */
1367 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1368 /*
1369 * children/sibling forms the list of my natural children
1370 */
1371 struct list_head children; /* list of my children */
1372 struct list_head sibling; /* linkage in my parent's children list */
1373 struct task_struct *group_leader; /* threadgroup leader */
1374
1375 /*
1376 * ptraced is the list of tasks this task is using ptrace on.
1377 * This includes both natural children and PTRACE_ATTACH targets.
1378 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1379 */
1380 struct list_head ptraced;
1381 struct list_head ptrace_entry;
1382
1383 /* PID/PID hash table linkage. */
1384 struct pid_link pids[PIDTYPE_MAX];
1385 struct list_head thread_group;
1386 struct list_head thread_node;
1387
1388 struct completion *vfork_done; /* for vfork() */
1389 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1390 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1391
1392 cputime_t utime, stime, utimescaled, stimescaled;
1393 cputime_t gtime;
1394 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1395 struct cputime prev_cputime;
1396 #endif
1397 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1398 seqlock_t vtime_seqlock;
1399 unsigned long long vtime_snap;
1400 enum {
1401 VTIME_SLEEPING = 0,
1402 VTIME_USER,
1403 VTIME_SYS,
1404 } vtime_snap_whence;
1405 #endif
1406 unsigned long nvcsw, nivcsw; /* context switch counts */
1407 struct timespec start_time; /* monotonic time */
1408 struct timespec real_start_time; /* boot based time */
1409 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1410 unsigned long min_flt, maj_flt;
1411
1412 struct task_cputime cputime_expires;
1413 struct list_head cpu_timers[3];
1414
1415 /* process credentials */
1416 const struct cred __rcu *real_cred; /* objective and real subjective task
1417 * credentials (COW) */
1418 const struct cred __rcu *cred; /* effective (overridable) subjective task
1419 * credentials (COW) */
1420 char comm[TASK_COMM_LEN]; /* executable name excluding path
1421 - access with [gs]et_task_comm (which lock
1422 it with task_lock())
1423 - initialized normally by setup_new_exec */
1424 /* file system info */
1425 int link_count, total_link_count;
1426 #ifdef CONFIG_SYSVIPC
1427 /* ipc stuff */
1428 struct sysv_sem sysvsem;
1429 #endif
1430 /* CPU-specific state of this task */
1431 struct thread_struct thread;
1432 /* filesystem information */
1433 struct fs_struct *fs;
1434 /* open file information */
1435 struct files_struct *files;
1436 /* namespaces */
1437 struct nsproxy *nsproxy;
1438 /* signal handlers */
1439 struct signal_struct *signal;
1440 struct sighand_struct *sighand;
1441
1442 sigset_t blocked, real_blocked;
1443 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1444 struct sigpending pending;
1445
1446 unsigned long sas_ss_sp;
1447 size_t sas_ss_size;
1448 int (*notifier)(void *priv);
1449 void *notifier_data;
1450 sigset_t *notifier_mask;
1451 struct callback_head *task_works;
1452
1453 struct audit_context *audit_context;
1454 #ifdef CONFIG_AUDITSYSCALL
1455 kuid_t loginuid;
1456 unsigned int sessionid;
1457 #endif
1458 struct seccomp seccomp;
1459
1460 /* Thread group tracking */
1461 u32 parent_exec_id;
1462 u32 self_exec_id;
1463 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1464 * mempolicy */
1465 spinlock_t alloc_lock;
1466
1467 /* Protection of the PI data structures: */
1468 raw_spinlock_t pi_lock;
1469
1470 #ifdef CONFIG_RT_MUTEXES
1471 /* PI waiters blocked on a rt_mutex held by this task */
1472 #ifndef __GENKSYMS__
1473 struct rb_root pi_waiters;
1474 struct rb_node *pi_waiters_leftmost;
1475 #else
1476 struct plist_head pi_waiters;
1477 #endif
1478 /* Deadlock detection and priority inheritance handling */
1479 struct rt_mutex_waiter *pi_blocked_on;
1480 #endif
1481
1482 #ifdef CONFIG_DEBUG_MUTEXES
1483 /* mutex deadlock detection */
1484 struct mutex_waiter *blocked_on;
1485 #endif
1486 #ifdef CONFIG_TRACE_IRQFLAGS
1487 unsigned int irq_events;
1488 unsigned long hardirq_enable_ip;
1489 unsigned long hardirq_disable_ip;
1490 unsigned int hardirq_enable_event;
1491 unsigned int hardirq_disable_event;
1492 int hardirqs_enabled;
1493 int hardirq_context;
1494 unsigned long softirq_disable_ip;
1495 unsigned long softirq_enable_ip;
1496 unsigned int softirq_disable_event;
1497 unsigned int softirq_enable_event;
1498 int softirqs_enabled;
1499 int softirq_context;
1500 #endif
1501 #ifdef CONFIG_LOCKDEP
1502 # define MAX_LOCK_DEPTH 48UL
1503 u64 curr_chain_key;
1504 int lockdep_depth;
1505 unsigned int lockdep_recursion;
1506 struct held_lock held_locks[MAX_LOCK_DEPTH];
1507 gfp_t lockdep_reclaim_gfp;
1508 #endif
1509
1510 /* journalling filesystem info */
1511 void *journal_info;
1512
1513 /* stacked block device info */
1514 struct bio_list *bio_list;
1515
1516 #ifdef CONFIG_BLOCK
1517 /* stack plugging */
1518 struct blk_plug *plug;
1519 #endif
1520
1521 /* VM state */
1522 struct reclaim_state *reclaim_state;
1523
1524 struct backing_dev_info *backing_dev_info;
1525
1526 struct io_context *io_context;
1527
1528 unsigned long ptrace_message;
1529 siginfo_t *last_siginfo; /* For ptrace use. */
1530 struct task_io_accounting ioac;
1531 #if defined(CONFIG_TASK_XACCT)
1532 u64 acct_rss_mem1; /* accumulated rss usage */
1533 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1534 cputime_t acct_timexpd; /* stime + utime since last update */
1535 #endif
1536 #ifdef CONFIG_CPUSETS
1537 nodemask_t mems_allowed; /* Protected by alloc_lock */
1538 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1539 int cpuset_mem_spread_rotor;
1540 int cpuset_slab_spread_rotor;
1541 #endif
1542 #ifdef CONFIG_CGROUPS
1543 /* Control Group info protected by css_set_lock */
1544 struct css_set __rcu *cgroups;
1545 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1546 struct list_head cg_list;
1547 #endif
1548 #ifdef CONFIG_FUTEX
1549 struct robust_list_head __user *robust_list;
1550 #ifdef CONFIG_COMPAT
1551 struct compat_robust_list_head __user *compat_robust_list;
1552 #endif
1553 struct list_head pi_state_list;
1554 struct futex_pi_state *pi_state_cache;
1555 #endif
1556 #ifdef CONFIG_PERF_EVENTS
1557 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1558 struct mutex perf_event_mutex;
1559 struct list_head perf_event_list;
1560 #endif
1561 #ifdef CONFIG_NUMA
1562 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1563 short il_next;
1564 short pref_node_fork;
1565 #endif
1566 #ifdef CONFIG_NUMA_BALANCING
1567 int numa_scan_seq;
1568 unsigned int numa_scan_period;
1569 unsigned int numa_scan_period_max;
1570 int numa_preferred_nid;
1571 unsigned long numa_migrate_retry;
1572 u64 node_stamp; /* migration stamp */
1573 u64 last_task_numa_placement;
1574 u64 last_sum_exec_runtime;
1575 struct callback_head numa_work;
1576
1577 struct list_head numa_entry;
1578 struct numa_group *numa_group;
1579
1580 /*
1581 * Exponential decaying average of faults on a per-node basis.
1582 * Scheduling placement decisions are made based on the these counts.
1583 * The values remain static for the duration of a PTE scan
1584 */
1585 unsigned long *numa_faults_memory;
1586 unsigned long total_numa_faults;
1587
1588 /*
1589 * numa_faults_buffer records faults per node during the current
1590 * scan window. When the scan completes, the counts in
1591 * numa_faults_memory decay and these values are copied.
1592 */
1593 unsigned long *numa_faults_buffer_memory;
1594
1595 /*
1596 * Track the nodes the process was running on when a NUMA hinting
1597 * fault was incurred.
1598 */
1599 unsigned long *numa_faults_cpu;
1600 unsigned long *numa_faults_buffer_cpu;
1601
1602 /*
1603 * numa_faults_locality tracks if faults recorded during the last
1604 * scan window were remote/local. The task scan period is adapted
1605 * based on the locality of the faults with different weights
1606 * depending on whether they were shared or private faults
1607 */
1608 unsigned long numa_faults_locality[2];
1609
1610 unsigned long numa_pages_migrated;
1611 #endif /* CONFIG_NUMA_BALANCING */
1612
1613 struct rcu_head rcu;
1614
1615 /*
1616 * cache last used pipe for splice
1617 */
1618 struct pipe_inode_info *splice_pipe;
1619
1620 struct page_frag task_frag;
1621
1622 #ifdef CONFIG_TASK_DELAY_ACCT
1623 struct task_delay_info *delays;
1624 #endif
1625 #ifdef CONFIG_FAULT_INJECTION
1626 int make_it_fail;
1627 #endif
1628 /*
1629 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1630 * balance_dirty_pages() for some dirty throttling pause
1631 */
1632 int nr_dirtied;
1633 int nr_dirtied_pause;
1634 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1635
1636 #ifdef CONFIG_LATENCYTOP
1637 int latency_record_count;
1638 struct latency_record latency_record[LT_SAVECOUNT];
1639 #endif
1640 /*
1641 * time slack values; these are used to round up poll() and
1642 * select() etc timeout values. These are in nanoseconds.
1643 */
1644 unsigned long timer_slack_ns;
1645 unsigned long default_timer_slack_ns;
1646
1647 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && !defined(CONFIG_S390)
1648 /* Index of current stored address in ret_stack */
1649 int curr_ret_stack;
1650 /* Stack of return addresses for return function tracing */
1651 struct ftrace_ret_stack *ret_stack;
1652 /* time stamp for last schedule */
1653 unsigned long long ftrace_timestamp;
1654 /*
1655 * Number of functions that haven't been traced
1656 * because of depth overrun.
1657 */
1658 atomic_t trace_overrun;
1659 /* Pause for the tracing */
1660 atomic_t tracing_graph_pause;
1661 #endif
1662 #ifdef CONFIG_TRACING
1663 /* state flags for use by tracers */
1664 unsigned long trace;
1665 /* bitmask and counter of trace recursion */
1666 unsigned long trace_recursion;
1667 #endif /* CONFIG_TRACING */
1668 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1669 struct memcg_batch_info {
1670 int do_batch; /* incremented when batch uncharge started */
1671 struct mem_cgroup *memcg; /* target memcg of uncharge */
1672 unsigned long nr_pages; /* uncharged usage */
1673 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1674 } memcg_batch;
1675 unsigned int memcg_kmem_skip_account;
1676 #endif
1677 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1678 atomic_t ptrace_bp_refcnt;
1679 #endif
1680 #if !defined(CONFIG_S390) && defined(CONFIG_UPROBES)
1681 struct uprobe_task *utask;
1682 #endif
1683 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1684 unsigned int sequential_io;
1685 unsigned int sequential_io_avg;
1686 #endif
1687
1688 /* reserved for Red Hat */
1689 #ifdef CONFIG_DETECT_HUNG_TASK
1690 RH_KABI_USE(1, unsigned long last_switch_count)
1691 #else
1692 RH_KABI_RESERVE(1)
1693 #endif
1694 RH_KABI_USE(2, unsigned long atomic_flags)
1695 #if defined(CONFIG_S390) && defined(CONFIG_UPROBES)
1696 RH_KABI_USE(3, struct uprobe_task *utask)
1697 #else
1698 RH_KABI_RESERVE(3)
1699 #endif
1700 /* This would be in rss_stat[MM_SHMEMPAGES] if not for kABI */
1701 RH_KABI_USE(4, int mm_shmempages)
1702 RH_KABI_RESERVE(5)
1703 RH_KABI_RESERVE(6)
1704 RH_KABI_RESERVE(7)
1705 RH_KABI_RESERVE(8)
1706 #ifndef __GENKSYMS__
1707 #ifdef CONFIG_MEMCG
1708 struct memcg_oom_info {
1709 struct mem_cgroup *memcg;
1710 gfp_t gfp_mask;
1711 int order;
1712 unsigned int may_oom:1;
1713 } memcg_oom;
1714 #endif
1715 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
1716 struct tlbflush_unmap_batch tlb_ubc;
1717 #endif
1718 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_S390)
1719 /* Index of current stored address in ret_stack */
1720 int curr_ret_stack;
1721 /* Stack of return addresses for return function tracing */
1722 struct ftrace_ret_stack *ret_stack;
1723 /* time stamp for last schedule */
1724 unsigned long long ftrace_timestamp;
1725 /*
1726 * Number of functions that haven't been traced
1727 * because of depth overrun.
1728 */
1729 atomic_t trace_overrun;
1730 /* Pause for the tracing */
1731 atomic_t tracing_graph_pause;
1732 #endif
1733 struct sched_dl_entity dl;
1734 #ifdef CONFIG_SMP
1735 struct rb_node pushable_dl_tasks;
1736 #endif
1737 struct sched_statistics statistics;
1738 #endif /* __GENKSYMS__ */
1739 };
类似资料：