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-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/slow-work-proc.c227
-rw-r--r--kernel/slow-work.c44
-rw-r--r--kernel/slow-work.h72
4 files changed, 333 insertions, 11 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index b8d4cd8ac0b..776ffed1556 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_X86_DS) += trace/
obj-$(CONFIG_RING_BUFFER) += trace/
obj-$(CONFIG_SMP) += sched_cpupri.o
obj-$(CONFIG_SLOW_WORK) += slow-work.o
+obj-$(CONFIG_SLOW_WORK_PROC) += slow-work-proc.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o
ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
diff --git a/kernel/slow-work-proc.c b/kernel/slow-work-proc.c
new file mode 100644
index 00000000000..3988032571f
--- /dev/null
+++ b/kernel/slow-work-proc.c
@@ -0,0 +1,227 @@
+/* Slow work debugging
+ *
+ * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/slow-work.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/seq_file.h>
+#include "slow-work.h"
+
+#define ITERATOR_SHIFT (BITS_PER_LONG - 4)
+#define ITERATOR_SELECTOR (0xfUL << ITERATOR_SHIFT)
+#define ITERATOR_COUNTER (~ITERATOR_SELECTOR)
+
+void slow_work_new_thread_desc(struct slow_work *work, struct seq_file *m)
+{
+ seq_puts(m, "Slow-work: New thread");
+}
+
+/*
+ * Render the time mark field on a work item into a 5-char time with units plus
+ * a space
+ */
+static void slow_work_print_mark(struct seq_file *m, struct slow_work *work)
+{
+ struct timespec now, diff;
+
+ now = CURRENT_TIME;
+ diff = timespec_sub(now, work->mark);
+
+ if (diff.tv_sec < 0)
+ seq_puts(m, " -ve ");
+ else if (diff.tv_sec == 0 && diff.tv_nsec < 1000)
+ seq_printf(m, "%3luns ", diff.tv_nsec);
+ else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000)
+ seq_printf(m, "%3luus ", diff.tv_nsec / 1000);
+ else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000000)
+ seq_printf(m, "%3lums ", diff.tv_nsec / 1000000);
+ else if (diff.tv_sec <= 1)
+ seq_puts(m, " 1s ");
+ else if (diff.tv_sec < 60)
+ seq_printf(m, "%4lus ", diff.tv_sec);
+ else if (diff.tv_sec < 60 * 60)
+ seq_printf(m, "%4lum ", diff.tv_sec / 60);
+ else if (diff.tv_sec < 60 * 60 * 24)
+ seq_printf(m, "%4luh ", diff.tv_sec / 3600);
+ else
+ seq_puts(m, "exces ");
+}
+
+/*
+ * Describe a slow work item for /proc
+ */
+static int slow_work_runqueue_show(struct seq_file *m, void *v)
+{
+ struct slow_work *work;
+ struct list_head *p = v;
+ unsigned long id;
+
+ switch ((unsigned long) v) {
+ case 1:
+ seq_puts(m, "THR PID ITEM ADDR FL MARK DESC\n");
+ return 0;
+ case 2:
+ seq_puts(m, "=== ===== ================ == ===== ==========\n");
+ return 0;
+
+ case 3 ... 3 + SLOW_WORK_THREAD_LIMIT - 1:
+ id = (unsigned long) v - 3;
+
+ read_lock(&slow_work_execs_lock);
+ work = slow_work_execs[id];
+ if (work) {
+ smp_read_barrier_depends();
+
+ seq_printf(m, "%3lu %5d %16p %2lx ",
+ id, slow_work_pids[id], work, work->flags);
+ slow_work_print_mark(m, work);
+
+ if (work->ops->desc)
+ work->ops->desc(work, m);
+ seq_putc(m, '\n');
+ }
+ read_unlock(&slow_work_execs_lock);
+ return 0;
+
+ default:
+ work = list_entry(p, struct slow_work, link);
+ seq_printf(m, "%3s - %16p %2lx ",
+ work->flags & SLOW_WORK_VERY_SLOW ? "vsq" : "sq",
+ work, work->flags);
+ slow_work_print_mark(m, work);
+
+ if (work->ops->desc)
+ work->ops->desc(work, m);
+ seq_putc(m, '\n');
+ return 0;
+ }
+}
+
+/*
+ * map the iterator to a work item
+ */
+static void *slow_work_runqueue_index(struct seq_file *m, loff_t *_pos)
+{
+ struct list_head *p;
+ unsigned long count, id;
+
+ switch (*_pos >> ITERATOR_SHIFT) {
+ case 0x0:
+ if (*_pos == 0)
+ *_pos = 1;
+ if (*_pos < 3)
+ return (void *)(unsigned long) *_pos;
+ if (*_pos < 3 + SLOW_WORK_THREAD_LIMIT)
+ for (id = *_pos - 3;
+ id < SLOW_WORK_THREAD_LIMIT;
+ id++, (*_pos)++)
+ if (slow_work_execs[id])
+ return (void *)(unsigned long) *_pos;
+ *_pos = 0x1UL << ITERATOR_SHIFT;
+
+ case 0x1:
+ count = *_pos & ITERATOR_COUNTER;
+ list_for_each(p, &slow_work_queue) {
+ if (count == 0)
+ return p;
+ count--;
+ }
+ *_pos = 0x2UL << ITERATOR_SHIFT;
+
+ case 0x2:
+ count = *_pos & ITERATOR_COUNTER;
+ list_for_each(p, &vslow_work_queue) {
+ if (count == 0)
+ return p;
+ count--;
+ }
+ *_pos = 0x3UL << ITERATOR_SHIFT;
+
+ default:
+ return NULL;
+ }
+}
+
+/*
+ * set up the iterator to start reading from the first line
+ */
+static void *slow_work_runqueue_start(struct seq_file *m, loff_t *_pos)
+{
+ spin_lock_irq(&slow_work_queue_lock);
+ return slow_work_runqueue_index(m, _pos);
+}
+
+/*
+ * move to the next line
+ */
+static void *slow_work_runqueue_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ struct list_head *p = v;
+ unsigned long selector = *_pos >> ITERATOR_SHIFT;
+
+ (*_pos)++;
+ switch (selector) {
+ case 0x0:
+ return slow_work_runqueue_index(m, _pos);
+
+ case 0x1:
+ if (*_pos >> ITERATOR_SHIFT == 0x1) {
+ p = p->next;
+ if (p != &slow_work_queue)
+ return p;
+ }
+ *_pos = 0x2UL << ITERATOR_SHIFT;
+ p = &vslow_work_queue;
+
+ case 0x2:
+ if (*_pos >> ITERATOR_SHIFT == 0x2) {
+ p = p->next;
+ if (p != &vslow_work_queue)
+ return p;
+ }
+ *_pos = 0x3UL << ITERATOR_SHIFT;
+
+ default:
+ return NULL;
+ }
+}
+
+/*
+ * clean up after reading
+ */
+static void slow_work_runqueue_stop(struct seq_file *m, void *v)
+{
+ spin_unlock_irq(&slow_work_queue_lock);
+}
+
+static const struct seq_operations slow_work_runqueue_ops = {
+ .start = slow_work_runqueue_start,
+ .stop = slow_work_runqueue_stop,
+ .next = slow_work_runqueue_next,
+ .show = slow_work_runqueue_show,
+};
+
+/*
+ * open "/proc/slow_work_rq" to list queue contents
+ */
+static int slow_work_runqueue_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &slow_work_runqueue_ops);
+}
+
+const struct file_operations slow_work_runqueue_fops = {
+ .owner = THIS_MODULE,
+ .open = slow_work_runqueue_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
index f67e1daae93..b763bc2d267 100644
--- a/kernel/slow-work.c
+++ b/kernel/slow-work.c
@@ -16,13 +16,8 @@
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/wait.h>
-
-#define SLOW_WORK_CULL_TIMEOUT (5 * HZ) /* cull threads 5s after running out of
- * things to do */
-#define SLOW_WORK_OOM_TIMEOUT (5 * HZ) /* can't start new threads for 5s after
- * OOM */
-
-#define SLOW_WORK_THREAD_LIMIT 255 /* abs maximum number of slow-work threads */
+#include <linux/proc_fs.h>
+#include "slow-work.h"
static void slow_work_cull_timeout(unsigned long);
static void slow_work_oom_timeout(unsigned long);
@@ -117,6 +112,15 @@ static DEFINE_MUTEX(slow_work_unreg_sync_lock);
#endif
/*
+ * Data for tracking currently executing items for indication through /proc
+ */
+#ifdef CONFIG_SLOW_WORK_PROC
+struct slow_work *slow_work_execs[SLOW_WORK_THREAD_LIMIT];
+pid_t slow_work_pids[SLOW_WORK_THREAD_LIMIT];
+DEFINE_RWLOCK(slow_work_execs_lock);
+#endif
+
+/*
* The queues of work items and the lock governing access to them. These are
* shared between all the CPUs. It doesn't make sense to have per-CPU queues
* as the number of threads bears no relation to the number of CPUs.
@@ -124,9 +128,9 @@ static DEFINE_MUTEX(slow_work_unreg_sync_lock);
* There are two queues of work items: one for slow work items, and one for
* very slow work items.
*/
-static LIST_HEAD(slow_work_queue);
-static LIST_HEAD(vslow_work_queue);
-static DEFINE_SPINLOCK(slow_work_queue_lock);
+LIST_HEAD(slow_work_queue);
+LIST_HEAD(vslow_work_queue);
+DEFINE_SPINLOCK(slow_work_queue_lock);
/*
* The thread controls. A variable used to signal to the threads that they
@@ -182,7 +186,7 @@ static unsigned slow_work_calc_vsmax(void)
* Attempt to execute stuff queued on a slow thread. Return true if we managed
* it, false if there was nothing to do.
*/
-static bool slow_work_execute(int id)
+static noinline bool slow_work_execute(int id)
{
#ifdef CONFIG_MODULES
struct module *module;
@@ -227,6 +231,10 @@ static bool slow_work_execute(int id)
if (work)
slow_work_thread_processing[id] = work->owner;
#endif
+ if (work) {
+ slow_work_mark_time(work);
+ slow_work_begin_exec(id, work);
+ }
spin_unlock_irq(&slow_work_queue_lock);
@@ -247,6 +255,8 @@ static bool slow_work_execute(int id)
/* wake up anyone waiting for this work to be complete */
wake_up_bit(&work->flags, SLOW_WORK_EXECUTING);
+ slow_work_end_exec(id, work);
+
/* if someone tried to enqueue the item whilst we were executing it,
* then it'll be left unenqueued to avoid multiple threads trying to
* execute it simultaneously
@@ -285,6 +295,7 @@ auto_requeue:
* - we transfer our ref on the item back to the appropriate queue
* - don't wake another thread up as we're awake already
*/
+ slow_work_mark_time(work);
if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
list_add_tail(&work->link, &vslow_work_queue);
else
@@ -368,6 +379,7 @@ int slow_work_enqueue(struct slow_work *work)
ret = slow_work_get_ref(work);
if (ret < 0)
goto failed;
+ slow_work_mark_time(work);
if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
list_add_tail(&work->link, &vslow_work_queue);
else
@@ -489,6 +501,7 @@ static void delayed_slow_work_timer(unsigned long data)
set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
put = true;
} else {
+ slow_work_mark_time(work);
if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
list_add_tail(&work->link, &vslow_work_queue);
else
@@ -627,6 +640,7 @@ static int slow_work_thread(void *_data)
id = find_first_zero_bit(slow_work_ids, SLOW_WORK_THREAD_LIMIT);
BUG_ON(id < 0 || id >= SLOW_WORK_THREAD_LIMIT);
__set_bit(id, slow_work_ids);
+ slow_work_set_thread_pid(id, current->pid);
spin_unlock_irq(&slow_work_queue_lock);
sprintf(current->comm, "kslowd%03u", id);
@@ -669,6 +683,7 @@ static int slow_work_thread(void *_data)
}
spin_lock_irq(&slow_work_queue_lock);
+ slow_work_set_thread_pid(id, 0);
__clear_bit(id, slow_work_ids);
spin_unlock_irq(&slow_work_queue_lock);
@@ -722,6 +737,9 @@ static void slow_work_new_thread_execute(struct slow_work *work)
static const struct slow_work_ops slow_work_new_thread_ops = {
.owner = THIS_MODULE,
.execute = slow_work_new_thread_execute,
+#ifdef CONFIG_SLOW_WORK_PROC
+ .desc = slow_work_new_thread_desc,
+#endif
};
/*
@@ -949,6 +967,10 @@ static int __init init_slow_work(void)
if (slow_work_max_max_threads < nr_cpus * 2)
slow_work_max_max_threads = nr_cpus * 2;
#endif
+#ifdef CONFIG_SLOW_WORK_PROC
+ proc_create("slow_work_rq", S_IFREG | 0400, NULL,
+ &slow_work_runqueue_fops);
+#endif
return 0;
}
diff --git a/kernel/slow-work.h b/kernel/slow-work.h
new file mode 100644
index 00000000000..3c2f007f3ad
--- /dev/null
+++ b/kernel/slow-work.h
@@ -0,0 +1,72 @@
+/* Slow work private definitions
+ *
+ * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#define SLOW_WORK_CULL_TIMEOUT (5 * HZ) /* cull threads 5s after running out of
+ * things to do */
+#define SLOW_WORK_OOM_TIMEOUT (5 * HZ) /* can't start new threads for 5s after
+ * OOM */
+
+#define SLOW_WORK_THREAD_LIMIT 255 /* abs maximum number of slow-work threads */
+
+/*
+ * slow-work.c
+ */
+#ifdef CONFIG_SLOW_WORK_PROC
+extern struct slow_work *slow_work_execs[];
+extern pid_t slow_work_pids[];
+extern rwlock_t slow_work_execs_lock;
+#endif
+
+extern struct list_head slow_work_queue;
+extern struct list_head vslow_work_queue;
+extern spinlock_t slow_work_queue_lock;
+
+/*
+ * slow-work-proc.c
+ */
+#ifdef CONFIG_SLOW_WORK_PROC
+extern const struct file_operations slow_work_runqueue_fops;
+
+extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *);
+#endif
+
+/*
+ * Helper functions
+ */
+static inline void slow_work_set_thread_pid(int id, pid_t pid)
+{
+#ifdef CONFIG_SLOW_WORK_PROC
+ slow_work_pids[id] = pid;
+#endif
+}
+
+static inline void slow_work_mark_time(struct slow_work *work)
+{
+#ifdef CONFIG_SLOW_WORK_PROC
+ work->mark = CURRENT_TIME;
+#endif
+}
+
+static inline void slow_work_begin_exec(int id, struct slow_work *work)
+{
+#ifdef CONFIG_SLOW_WORK_PROC
+ slow_work_execs[id] = work;
+#endif
+}
+
+static inline void slow_work_end_exec(int id, struct slow_work *work)
+{
+#ifdef CONFIG_SLOW_WORK_PROC
+ write_lock(&slow_work_execs_lock);
+ slow_work_execs[id] = NULL;
+ write_unlock(&slow_work_execs_lock);
+#endif
+}