1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * Linux Trace Toolkit Next Generation Kernel State Dump
7 * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
8 * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * Eric Clement: Add listing of network IP interface
12 * 2006, 2007 Mathieu Desnoyers Fix kernel threads
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/netlink.h>
19 #include <linux/inet.h>
21 #include <linux/kthread.h>
22 #include <linux/proc_fs.h>
23 #include <linux/file.h>
24 #include <linux/interrupt.h>
25 #include <linux/irqnr.h>
26 #include <linux/netdevice.h>
27 #include <linux/inetdevice.h>
29 #include <linux/swap.h>
30 #include <linux/wait.h>
31 #include <linux/mutex.h>
32 #include <linux/device.h>
34 #include <linux/blkdev.h>
36 #include <lttng/events.h>
37 #include <lttng/tracer.h>
38 #include <wrapper/cpu.h>
39 #include <wrapper/irqdesc.h>
40 #include <wrapper/fdtable.h>
41 #include <wrapper/namespace.h>
42 #include <wrapper/irq.h>
43 #include <wrapper/tracepoint.h>
44 #include <wrapper/genhd.h>
45 #include <wrapper/file.h>
46 #include <wrapper/fdtable.h>
47 #include <wrapper/sched.h>
49 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
50 #include <linux/irq.h>
53 /* Define the tracepoints, but do not build the probes */
54 #define CREATE_TRACE_POINTS
55 #define TRACE_INCLUDE_PATH instrumentation/events
56 #define TRACE_INCLUDE_FILE lttng-statedump
57 #define LTTNG_INSTRUMENTATION
58 #include <instrumentation/events/lttng-statedump.h>
60 LTTNG_DEFINE_TRACE(lttng_statedump_block_device
,
61 TP_PROTO(struct lttng_kernel_session
*session
,
62 dev_t dev
, const char *diskname
),
63 TP_ARGS(session
, dev
, diskname
));
65 LTTNG_DEFINE_TRACE(lttng_statedump_end
,
66 TP_PROTO(struct lttng_kernel_session
*session
),
69 LTTNG_DEFINE_TRACE(lttng_statedump_interrupt
,
70 TP_PROTO(struct lttng_kernel_session
*session
,
71 unsigned int irq
, const char *chip_name
,
72 struct irqaction
*action
),
73 TP_ARGS(session
, irq
, chip_name
, action
));
75 LTTNG_DEFINE_TRACE(lttng_statedump_file_descriptor
,
76 TP_PROTO(struct lttng_kernel_session
*session
,
77 struct files_struct
*files
,
78 int fd
, const char *filename
,
79 unsigned int flags
, fmode_t fmode
),
80 TP_ARGS(session
, files
, fd
, filename
, flags
, fmode
));
82 LTTNG_DEFINE_TRACE(lttng_statedump_start
,
83 TP_PROTO(struct lttng_kernel_session
*session
),
86 LTTNG_DEFINE_TRACE(lttng_statedump_process_state
,
87 TP_PROTO(struct lttng_kernel_session
*session
,
88 struct task_struct
*p
,
89 int type
, int mode
, int submode
, int status
,
90 struct files_struct
*files
),
91 TP_ARGS(session
, p
, type
, mode
, submode
, status
, files
));
93 LTTNG_DEFINE_TRACE(lttng_statedump_process_pid_ns
,
94 TP_PROTO(struct lttng_kernel_session
*session
,
95 struct task_struct
*p
,
96 struct pid_namespace
*pid_ns
),
97 TP_ARGS(session
, p
, pid_ns
));
99 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0))
100 LTTNG_DEFINE_TRACE(lttng_statedump_process_cgroup_ns
,
101 TP_PROTO(struct lttng_kernel_session
*session
,
102 struct task_struct
*p
,
103 struct cgroup_namespace
*cgroup_ns
),
104 TP_ARGS(session
, p
, cgroup_ns
));
107 LTTNG_DEFINE_TRACE(lttng_statedump_process_ipc_ns
,
108 TP_PROTO(struct lttng_kernel_session
*session
,
109 struct task_struct
*p
,
110 struct ipc_namespace
*ipc_ns
),
111 TP_ARGS(session
, p
, ipc_ns
));
113 #ifndef LTTNG_MNT_NS_MISSING_HEADER
114 LTTNG_DEFINE_TRACE(lttng_statedump_process_mnt_ns
,
115 TP_PROTO(struct lttng_kernel_session
*session
,
116 struct task_struct
*p
,
117 struct mnt_namespace
*mnt_ns
),
118 TP_ARGS(session
, p
, mnt_ns
));
121 LTTNG_DEFINE_TRACE(lttng_statedump_process_net_ns
,
122 TP_PROTO(struct lttng_kernel_session
*session
,
123 struct task_struct
*p
,
125 TP_ARGS(session
, p
, net_ns
));
127 LTTNG_DEFINE_TRACE(lttng_statedump_process_user_ns
,
128 TP_PROTO(struct lttng_kernel_session
*session
,
129 struct task_struct
*p
,
130 struct user_namespace
*user_ns
),
131 TP_ARGS(session
, p
, user_ns
));
133 LTTNG_DEFINE_TRACE(lttng_statedump_process_uts_ns
,
134 TP_PROTO(struct lttng_kernel_session
*session
,
135 struct task_struct
*p
,
136 struct uts_namespace
*uts_ns
),
137 TP_ARGS(session
, p
, uts_ns
));
139 LTTNG_DEFINE_TRACE(lttng_statedump_process_time_ns
,
140 TP_PROTO(struct lttng_kernel_session
*session
,
141 struct task_struct
*p
,
142 struct time_namespace
*time_ns
),
143 TP_ARGS(session
, p
, time_ns
));
145 LTTNG_DEFINE_TRACE(lttng_statedump_network_interface
,
146 TP_PROTO(struct lttng_kernel_session
*session
,
147 struct net_device
*dev
, struct in_ifaddr
*ifa
),
148 TP_ARGS(session
, dev
, ifa
));
150 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
151 LTTNG_DEFINE_TRACE(lttng_statedump_cpu_topology
,
152 TP_PROTO(struct lttng_kernel_session
*session
, struct cpuinfo_x86
*c
),
153 TP_ARGS(session
, c
));
156 struct lttng_fd_ctx
{
158 struct lttng_kernel_session
*session
;
159 struct files_struct
*files
;
163 * Protected by the trace lock.
165 static struct delayed_work cpu_work
[NR_CPUS
];
166 static DECLARE_WAIT_QUEUE_HEAD(statedump_wq
);
167 static atomic_t kernel_threads_to_run
;
169 enum lttng_thread_type
{
170 LTTNG_USER_THREAD
= 0,
171 LTTNG_KERNEL_THREAD
= 1,
174 enum lttng_execution_mode
{
180 LTTNG_MODE_UNKNOWN
= 5,
183 enum lttng_execution_submode
{
188 enum lttng_process_status
{
200 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,0,0) || \
201 LTTNG_RHEL_KERNEL_RANGE(5,14,0,163,0,0, 5,15,0,0,0,0))
203 #define LTTNG_PART_STRUCT_TYPE struct block_device
206 int lttng_get_part_name(struct gendisk
*disk
, struct block_device
*part
, char *name_buf
)
210 ret
= snprintf(name_buf
, BDEVNAME_SIZE
, "%pg", part
);
211 if (ret
< 0 || ret
>= BDEVNAME_SIZE
)
218 dev_t
lttng_get_part_devt(struct block_device
*part
)
223 #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0))
225 #define LTTNG_PART_STRUCT_TYPE struct block_device
228 int lttng_get_part_name(struct gendisk
*disk
, struct block_device
*part
, char *name_buf
)
232 p
= bdevname(part
, name_buf
);
240 dev_t
lttng_get_part_devt(struct block_device
*part
)
247 #define LTTNG_PART_STRUCT_TYPE struct hd_struct
250 int lttng_get_part_name(struct gendisk
*disk
, struct hd_struct
*part
, char *name_buf
)
253 struct block_device bdev
;
256 * Create a partial 'struct blockdevice' to use
257 * 'bdevname()' which is a simple wrapper over
258 * 'disk_name()' but has the honor to be EXPORT_SYMBOL.
263 p
= bdevname(&bdev
, name_buf
);
271 dev_t
lttng_get_part_devt(struct hd_struct
*part
)
273 return part_devt(part
);
277 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0))
279 int lttng_statedump_each_block_device(struct lttng_kernel_session
*session
, struct gendisk
*disk
)
281 struct block_device
*part
;
285 /* Include partition 0 */
289 xa_for_each(&disk
->part_tbl
, idx
, part
) {
290 char name_buf
[BDEVNAME_SIZE
];
292 /* Exclude non-partitions bdev and empty partitions. */
293 if (bdev_is_partition(part
) && !bdev_nr_sectors(part
))
296 if (lttng_get_part_name(disk
, part
, name_buf
) == -ENOSYS
) {
300 trace_lttng_statedump_block_device(session
, lttng_get_part_devt(part
),
309 int lttng_statedump_each_block_device(struct lttng_kernel_session
*session
, struct gendisk
*disk
)
311 struct disk_part_iter piter
;
312 LTTNG_PART_STRUCT_TYPE
*part
;
314 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
316 while ((part
= disk_part_iter_next(&piter
))) {
317 char name_buf
[BDEVNAME_SIZE
];
319 if (lttng_get_part_name(disk
, part
, name_buf
) == -ENOSYS
) {
320 disk_part_iter_exit(&piter
);
323 trace_lttng_statedump_block_device(session
, lttng_get_part_devt(part
),
326 disk_part_iter_exit(&piter
);
333 int lttng_enumerate_block_devices(struct lttng_kernel_session
*session
)
335 struct class *ptr_block_class
;
336 struct device_type
*ptr_disk_type
;
337 struct class_dev_iter iter
;
341 ptr_block_class
= wrapper_get_block_class();
342 if (!ptr_block_class
) {
346 ptr_disk_type
= wrapper_get_disk_type();
347 if (!ptr_disk_type
) {
351 class_dev_iter_init(&iter
, ptr_block_class
, NULL
, ptr_disk_type
);
352 while ((dev
= class_dev_iter_next(&iter
))) {
353 struct gendisk
*disk
= dev_to_disk(dev
);
356 * Don't show empty devices or things that have been
359 if (get_capacity(disk
) == 0 ||
360 (disk
->flags
& LTTNG_GENHD_FL_HIDDEN
))
363 ret
= lttng_statedump_each_block_device(session
, disk
);
365 class_dev_iter_exit(&iter
);
373 void lttng_enumerate_device(struct lttng_kernel_session
*session
,
374 struct net_device
*dev
)
376 struct in_device
*in_dev
;
377 struct in_ifaddr
*ifa
;
379 if (dev
->flags
& IFF_UP
) {
380 in_dev
= in_dev_get(dev
);
382 for (ifa
= in_dev
->ifa_list
; ifa
!= NULL
;
383 ifa
= ifa
->ifa_next
) {
384 trace_lttng_statedump_network_interface(
390 trace_lttng_statedump_network_interface(
395 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0))
397 int lttng_enumerate_network_ip_interface(struct lttng_kernel_session
*session
)
399 struct net_device
*dev
;
402 for_each_netdev(&init_net
, dev
)
403 lttng_enumerate_device(session
, dev
);
410 int lttng_enumerate_network_ip_interface(struct lttng_kernel_session
*session
)
412 struct net_device
*dev
;
414 read_lock(&dev_base_lock
);
415 for_each_netdev(&init_net
, dev
)
416 lttng_enumerate_device(session
, dev
);
417 read_unlock(&dev_base_lock
);
421 #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) */
422 #else /* CONFIG_INET */
424 int lttng_enumerate_network_ip_interface(struct lttng_kernel_session
*session
)
428 #endif /* CONFIG_INET */
431 int lttng_dump_one_fd(const void *p
, struct file
*file
, unsigned int fd
)
433 const struct lttng_fd_ctx
*ctx
= p
;
434 const char *s
= d_path(&file
->f_path
, ctx
->page
, PAGE_SIZE
);
435 unsigned int flags
= file
->f_flags
;
439 * We don't expose kernel internal flags, only userspace-visible
442 flags
&= ~FMODE_NONOTIFY
;
443 fdt
= files_fdtable(ctx
->files
);
445 * We need to check here again whether fd is within the fdt
446 * max_fds range, because we might be seeing a different
447 * files_fdtable() than iterate_fd(), assuming only RCU is
448 * protecting the read. In reality, iterate_fd() holds
449 * file_lock, which should ensure the fdt does not change while
450 * the lock is taken, but we are not aware whether this is
451 * guaranteed or not, so play safe.
453 if (fd
< fdt
->max_fds
&& lttng_close_on_exec(fd
, fdt
))
456 struct dentry
*dentry
= file
->f_path
.dentry
;
458 /* Make sure we give at least some info */
459 spin_lock(&dentry
->d_lock
);
460 trace_lttng_statedump_file_descriptor(ctx
->session
,
461 ctx
->files
, fd
, dentry
->d_name
.name
, flags
,
463 spin_unlock(&dentry
->d_lock
);
466 trace_lttng_statedump_file_descriptor(ctx
->session
,
467 ctx
->files
, fd
, s
, flags
, file
->f_mode
);
472 /* Called with task lock held. */
474 void lttng_enumerate_files(struct lttng_kernel_session
*session
,
475 struct files_struct
*files
,
478 struct lttng_fd_ctx ctx
= { .page
= tmp
, .session
= session
, .files
= files
, };
480 lttng_iterate_fd(files
, 0, lttng_dump_one_fd
, &ctx
);
483 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
485 int lttng_enumerate_cpu_topology(struct lttng_kernel_session
*session
)
488 const cpumask_t
*cpumask
= cpu_possible_mask
;
490 for (cpu
= cpumask_first(cpumask
); cpu
< nr_cpu_ids
;
491 cpu
= cpumask_next(cpu
, cpumask
)) {
492 trace_lttng_statedump_cpu_topology(session
, &cpu_data(cpu
));
499 int lttng_enumerate_cpu_topology(struct lttng_kernel_session
*session
)
507 * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
508 * (scheduling in atomic). Normally, the tasklist lock protects this kind of
509 * iteration, but it is not exported to modules.
512 void lttng_enumerate_task_vm_maps(struct lttng_kernel_session
*session
,
513 struct task_struct
*p
)
515 struct mm_struct
*mm
;
516 struct vm_area_struct
*map
;
519 /* get_task_mm does a task_lock... */
526 down_read(&mm
->mmap_sem
);
529 ino
= map
->vm_file
->lttng_f_dentry
->d_inode
->i_ino
;
532 trace_lttng_statedump_vm_map(session
, p
, map
, ino
);
535 up_read(&mm
->mmap_sem
);
541 int lttng_enumerate_vm_maps(struct lttng_kernel_session
*session
)
543 struct task_struct
*p
;
547 lttng_enumerate_task_vm_maps(session
, p
);
553 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
556 int lttng_list_interrupts(struct lttng_kernel_session
*session
)
559 unsigned long flags
= 0;
560 struct irq_desc
*desc
;
562 #define irq_to_desc wrapper_irq_to_desc
564 for_each_irq_desc(irq
, desc
) {
565 struct irqaction
*action
;
566 const char *irq_chip_name
=
567 irq_desc_get_chip(desc
)->name
? : "unnamed_irq_chip";
569 local_irq_save(flags
);
570 raw_spin_lock(&desc
->lock
);
571 for (action
= desc
->action
; action
; action
= action
->next
) {
572 trace_lttng_statedump_interrupt(session
,
573 irq
, irq_chip_name
, action
);
575 raw_spin_unlock(&desc
->lock
);
576 local_irq_restore(flags
);
583 int lttng_list_interrupts(struct lttng_kernel_session
*session
)
590 * Statedump the task's namespaces using the proc filesystem inode number as
591 * the unique identifier. The user and pid ns are nested and will be dumped
594 * Called with task lock held.
597 void lttng_statedump_process_ns(struct lttng_kernel_session
*session
,
598 struct task_struct
*p
,
599 enum lttng_thread_type type
,
600 enum lttng_execution_mode mode
,
601 enum lttng_execution_submode submode
,
602 enum lttng_process_status status
)
604 struct nsproxy
*proxy
;
605 struct pid_namespace
*pid_ns
;
606 struct user_namespace
*user_ns
;
609 * The pid and user namespaces are special, they are nested and
610 * accessed with specific functions instead of the nsproxy struct
611 * like the other namespaces.
613 pid_ns
= task_active_pid_ns(p
);
615 trace_lttng_statedump_process_pid_ns(session
, p
, pid_ns
);
616 pid_ns
= pid_ns
? pid_ns
->parent
: NULL
;
620 user_ns
= task_cred_xxx(p
, user_ns
);
622 trace_lttng_statedump_process_user_ns(session
, p
, user_ns
);
624 * trace_lttng_statedump_process_user_ns() internally
625 * checks whether user_ns is NULL. While this does not
626 * appear to be a possible return value for
627 * task_cred_xxx(), err on the safe side and check
628 * for NULL here as well to be consistent with the
629 * paranoid behavior of
630 * trace_lttng_statedump_process_user_ns().
632 user_ns
= user_ns
? user_ns
->lttng_user_ns_parent
: NULL
;
636 * Back and forth on locking strategy within Linux upstream for nsproxy.
637 * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
638 * "namespaces: Use task_lock and not rcu to protect nsproxy"
641 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,17,0) || \
642 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
643 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
644 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
648 proxy
= task_nsproxy(p
);
651 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0))
652 trace_lttng_statedump_process_cgroup_ns(session
, p
, proxy
->cgroup_ns
);
654 trace_lttng_statedump_process_ipc_ns(session
, p
, proxy
->ipc_ns
);
655 #ifndef LTTNG_MNT_NS_MISSING_HEADER
656 trace_lttng_statedump_process_mnt_ns(session
, p
, proxy
->mnt_ns
);
658 trace_lttng_statedump_process_net_ns(session
, p
, proxy
->net_ns
);
659 trace_lttng_statedump_process_uts_ns(session
, p
, proxy
->uts_ns
);
660 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \
661 LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0))
662 trace_lttng_statedump_process_time_ns(session
, p
, proxy
->time_ns
);
665 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,17,0) || \
666 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
667 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
668 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
676 int lttng_enumerate_process_states(struct lttng_kernel_session
*session
)
678 struct task_struct
*g
, *p
;
681 tmp
= (char *) __get_free_page(GFP_KERNEL
);
686 for_each_process(g
) {
687 struct files_struct
*prev_files
= NULL
;
691 enum lttng_execution_mode mode
=
693 enum lttng_execution_submode submode
=
695 enum lttng_process_status status
;
696 enum lttng_thread_type type
;
697 struct files_struct
*files
;
700 if (p
->exit_state
== EXIT_ZOMBIE
)
701 status
= LTTNG_ZOMBIE
;
702 else if (p
->exit_state
== EXIT_DEAD
)
704 else if (lttng_task_is_running(p
)) {
705 /* Is this a forked child that has not run yet? */
706 if (list_empty(&p
->rt
.run_list
))
707 status
= LTTNG_WAIT_FORK
;
710 * All tasks are considered as wait_cpu;
711 * the viewer will sort out if the task
712 * was really running at this time.
714 status
= LTTNG_WAIT_CPU
;
715 } else if (lttng_get_task_state(p
) &
716 (TASK_INTERRUPTIBLE
| TASK_UNINTERRUPTIBLE
)) {
717 /* Task is waiting for something to complete */
720 status
= LTTNG_UNNAMED
;
721 submode
= LTTNG_NONE
;
724 * Verification of t->mm is to filter out kernel
725 * threads; Viewer will further filter out if a
726 * user-space thread was in syscall mode or not.
729 type
= LTTNG_USER_THREAD
;
731 type
= LTTNG_KERNEL_THREAD
;
734 trace_lttng_statedump_process_state(session
,
735 p
, type
, mode
, submode
, status
, files
);
736 lttng_statedump_process_ns(session
,
737 p
, type
, mode
, submode
, status
);
739 * As an optimisation for the common case, do not
740 * repeat information for the same files_struct in
741 * two consecutive threads. This is the common case
742 * for threads sharing the same fd table. RCU guarantees
743 * that the same files_struct pointer is not re-used
744 * throughout processes/threads iteration.
746 if (files
&& files
!= prev_files
) {
747 lttng_enumerate_files(session
, files
, tmp
);
751 } while_each_thread(g
, p
);
755 free_page((unsigned long) tmp
);
761 void lttng_statedump_work_func(struct work_struct
*work
)
763 if (atomic_dec_and_test(&kernel_threads_to_run
))
764 /* If we are the last thread, wake up do_lttng_statedump */
765 wake_up(&statedump_wq
);
769 int do_lttng_statedump(struct lttng_kernel_session
*session
)
773 trace_lttng_statedump_start(session
);
774 ret
= lttng_enumerate_process_states(session
);
779 * ret = lttng_enumerate_vm_maps(session);
783 ret
= lttng_list_interrupts(session
);
786 ret
= lttng_enumerate_network_ip_interface(session
);
789 ret
= lttng_enumerate_block_devices(session
);
794 printk(KERN_WARNING
"LTTng: block device enumeration is not supported by kernel\n");
799 ret
= lttng_enumerate_cpu_topology(session
);
803 /* TODO lttng_dump_idt_table(session); */
804 /* TODO lttng_dump_softirq_vec(session); */
805 /* TODO lttng_list_modules(session); */
806 /* TODO lttng_dump_swap_files(session); */
809 * Fire off a work queue on each CPU. Their sole purpose in life
810 * is to guarantee that each CPU has been in a state where is was in
811 * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
813 lttng_cpus_read_lock();
814 atomic_set(&kernel_threads_to_run
, num_online_cpus());
815 for_each_online_cpu(cpu
) {
816 INIT_DELAYED_WORK(&cpu_work
[cpu
], lttng_statedump_work_func
);
817 schedule_delayed_work_on(cpu
, &cpu_work
[cpu
], 0);
819 /* Wait for all threads to run */
820 __wait_event(statedump_wq
, (atomic_read(&kernel_threads_to_run
) == 0));
821 lttng_cpus_read_unlock();
822 /* Our work is done */
823 trace_lttng_statedump_end(session
);
828 * Called with session mutex held.
830 int lttng_statedump_start(struct lttng_kernel_session
*session
)
832 return do_lttng_statedump(session
);
834 EXPORT_SYMBOL_GPL(lttng_statedump_start
);
837 int __init
lttng_statedump_init(void)
840 * Allow module to load even if the fixup cannot be done. This
841 * will allow seemless transition when the underlying issue fix
842 * is merged into the Linux kernel, and when tracepoint.c
843 * "tracepoint_module_notify" is turned into a static function.
845 (void) wrapper_lttng_fixup_sig(THIS_MODULE
);
849 module_init(lttng_statedump_init
);
852 void __exit
lttng_statedump_exit(void)
856 module_exit(lttng_statedump_exit
);
858 MODULE_LICENSE("GPL and additional rights");
859 MODULE_AUTHOR("Jean-Hugues Deschenes");
860 MODULE_DESCRIPTION("LTTng statedump provider");
861 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION
) "."
862 __stringify(LTTNG_MODULES_MINOR_VERSION
) "."
863 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION
)
864 LTTNG_MODULES_EXTRAVERSION
);