Create a dynamically sized pool of threads for doing very slow work items

Create a dynamically sized pool of threads for doing very slow work items, such
as invoking mkdir() or rmdir() - things that may take a long time and may
sleep, holding mutexes/semaphores and hogging a thread, and are thus unsuitable
for workqueues.

The number of threads is always at least a settable minimum, but more are
started when there's more work to do, up to a limit.  Because of the nature of
the load, it's not suitable for a 1-thread-per-CPU type pool.  A system with
one CPU may well want several threads.

This is used by FS-Cache to do slow caching operations in the background, such
as looking up, creating or deleting cache objects.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>

1 files changed, 388 insertions, 0 deletions

diff --git a/kernel/slow-work.c b/kernel/slow-work.c
new file mode 100644
index 000000000000..5a7392734c82
--- /dev/null
+++ b/kernel/slow-work.c
@@ -0,0 +1,388 @@
+/* Worker thread pool for slow items, such as filesystem lookups or mkdirs
+ *
+ * Copyright (C) 2008 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/kthread.h>
+#include <linux/freezer.h>
+#include <linux/wait.h>
+#include <asm/system.h>
+
+/*
+ * The pool of threads has at least min threads in it as long as someone is
+ * using the facility, and may have as many as max.
+ *
+ * A portion of the pool may be processing very slow operations.
+ */
+static unsigned slow_work_min_threads = 2;
+static unsigned slow_work_max_threads = 4;
+static unsigned vslow_work_proportion = 50; /* % of threads that may process
+                                             * very slow work */
+static atomic_t slow_work_thread_count;
+static atomic_t vslow_work_executing_count;
+
+/*
+ * 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.
+ *
+ * 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);
+
+/*
+ * The thread controls.  A variable used to signal to the threads that they
+ * should exit when the queue is empty, a waitqueue used by the threads to wait
+ * for signals, and a completion set by the last thread to exit.
+ */
+static bool slow_work_threads_should_exit;
+static DECLARE_WAIT_QUEUE_HEAD(slow_work_thread_wq);
+static DECLARE_COMPLETION(slow_work_last_thread_exited);
+
+/*
+ * The number of users of the thread pool and its lock.  Whilst this is zero we
+ * have no threads hanging around, and when this reaches zero, we wait for all
+ * active or queued work items to complete and kill all the threads we do have.
+ */
+static int slow_work_user_count;
+static DEFINE_MUTEX(slow_work_user_lock);
+
+/*
+ * Calculate the maximum number of active threads in the pool that are
+ * permitted to process very slow work items.
+ *
+ * The answer is rounded up to at least 1, but may not equal or exceed the
+ * maximum number of the threads in the pool.  This means we always have at
+ * least one thread that can process slow work items, and we always have at
+ * least one thread that won't get tied up doing so.
+ */
+static unsigned slow_work_calc_vsmax(void)
+{
+        unsigned vsmax;
+
+        vsmax = atomic_read(&slow_work_thread_count) * vslow_work_proportion;
+        vsmax /= 100;
+        vsmax = max(vsmax, 1U);
+        return min(vsmax, slow_work_max_threads - 1);
+}
+
+/*
+ * 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(void)
+{
+        struct slow_work *work = NULL;
+        unsigned vsmax;
+        bool very_slow;
+
+        vsmax = slow_work_calc_vsmax();
+
+        /* find something to execute */
+        spin_lock_irq(&slow_work_queue_lock);
+        if (!list_empty(&vslow_work_queue) &&
+            atomic_read(&vslow_work_executing_count) < vsmax) {
+                work = list_entry(vslow_work_queue.next,
+                                  struct slow_work, link);
+                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
+                        BUG();
+                list_del_init(&work->link);
+                atomic_inc(&vslow_work_executing_count);
+                very_slow = true;
+        } else if (!list_empty(&slow_work_queue)) {
+                work = list_entry(slow_work_queue.next,
+                                  struct slow_work, link);
+                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
+                        BUG();
+                list_del_init(&work->link);
+                very_slow = false;
+        } else {
+                very_slow = false; /* avoid the compiler warning */
+        }
+        spin_unlock_irq(&slow_work_queue_lock);
+
+        if (!work)
+                return false;
+
+        if (!test_and_clear_bit(SLOW_WORK_PENDING, &work->flags))
+                BUG();
+
+        work->ops->execute(work);
+
+        if (very_slow)
+                atomic_dec(&vslow_work_executing_count);
+        clear_bit_unlock(SLOW_WORK_EXECUTING, &work->flags);
+
+        /* 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
+         *
+         * there is, however, a race between us testing the pending flag and
+         * getting the spinlock, and between the enqueuer setting the pending
+         * flag and getting the spinlock, so we use a deferral bit to tell us
+         * if the enqueuer got there first
+         */
+        if (test_bit(SLOW_WORK_PENDING, &work->flags)) {
+                spin_lock_irq(&slow_work_queue_lock);
+
+                if (!test_bit(SLOW_WORK_EXECUTING, &work->flags) &&
+                    test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags))
+                        goto auto_requeue;
+
+                spin_unlock_irq(&slow_work_queue_lock);
+        }
+
+        work->ops->put_ref(work);
+        return true;
+
+auto_requeue:
+        /* we must complete the enqueue operation
+         * - we transfer our ref on the item back to the appropriate queue
+         * - don't wake another thread up as we're awake already
+         */
+        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
+                list_add_tail(&work->link, &vslow_work_queue);
+        else
+                list_add_tail(&work->link, &slow_work_queue);
+        spin_unlock_irq(&slow_work_queue_lock);
+        return true;
+}
+
+/**
+ * slow_work_enqueue - Schedule a slow work item for processing
+ * @work: The work item to queue
+ *
+ * Schedule a slow work item for processing.  If the item is already undergoing
+ * execution, this guarantees not to re-enter the execution routine until the
+ * first execution finishes.
+ *
+ * The item is pinned by this function as it retains a reference to it, managed
+ * through the item operations.  The item is unpinned once it has been
+ * executed.
+ *
+ * An item may hog the thread that is running it for a relatively large amount
+ * of time, sufficient, for example, to perform several lookup, mkdir, create
+ * and setxattr operations.  It may sleep on I/O and may sleep to obtain locks.
+ *
+ * Conversely, if a number of items are awaiting processing, it may take some
+ * time before any given item is given attention.  The number of threads in the
+ * pool may be increased to deal with demand, but only up to a limit.
+ *
+ * If SLOW_WORK_VERY_SLOW is set on the work item, then it will be placed in
+ * the very slow queue, from which only a portion of the threads will be
+ * allowed to pick items to execute.  This ensures that very slow items won't
+ * overly block ones that are just ordinarily slow.
+ *
+ * Returns 0 if successful, -EAGAIN if not.
+ */
+int slow_work_enqueue(struct slow_work *work)
+{
+        unsigned long flags;
+
+        BUG_ON(slow_work_user_count <= 0);
+        BUG_ON(!work);
+        BUG_ON(!work->ops);
+        BUG_ON(!work->ops->get_ref);
+
+        /* when honouring an enqueue request, we only promise that we will run
+         * the work function in the future; we do not promise to run it once
+         * per enqueue request
+         *
+         * we use the PENDING bit to merge together repeat requests without
+         * having to disable IRQs and take the spinlock, whilst still
+         * maintaining our promise
+         */
+        if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
+                spin_lock_irqsave(&slow_work_queue_lock, flags);
+
+                /* we promise that we will not attempt to execute the work
+                 * function in more than one thread simultaneously
+                 *
+                 * this, however, leaves us with a problem if we're asked to
+                 * enqueue the work whilst someone is executing the work
+                 * function as simply queueing the work immediately means that
+                 * another thread may try executing it whilst it is already
+                 * under execution
+                 *
+                 * to deal with this, we set the ENQ_DEFERRED bit instead of
+                 * enqueueing, and the thread currently executing the work
+                 * function will enqueue the work item when the work function
+                 * returns and it has cleared the EXECUTING bit
+                 */
+                if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
+                        set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
+                } else {
+                        if (work->ops->get_ref(work) < 0)
+                                goto cant_get_ref;
+                        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
+                                list_add_tail(&work->link, &vslow_work_queue);
+                        else
+                                list_add_tail(&work->link, &slow_work_queue);
+                        wake_up(&slow_work_thread_wq);
+                }
+
+                spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        }
+        return 0;
+
+cant_get_ref:
+        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        return -EAGAIN;
+}
+EXPORT_SYMBOL(slow_work_enqueue);
+
+/*
+ * Determine if there is slow work available for dispatch
+ */
+static inline bool slow_work_available(int vsmax)
+{
+        return !list_empty(&slow_work_queue) ||
+                (!list_empty(&vslow_work_queue) &&
+                 atomic_read(&vslow_work_executing_count) < vsmax);
+}
+
+/*
+ * Worker thread dispatcher
+ */
+static int slow_work_thread(void *_data)
+{
+        int vsmax;
+
+        DEFINE_WAIT(wait);
+
+        set_freezable();
+        set_user_nice(current, -5);
+
+        for (;;) {
+                vsmax = vslow_work_proportion;
+                vsmax *= atomic_read(&slow_work_thread_count);
+                vsmax /= 100;
+
+                prepare_to_wait(&slow_work_thread_wq, &wait,
+                                TASK_INTERRUPTIBLE);
+                if (!freezing(current) &&
+                    !slow_work_threads_should_exit &&
+                    !slow_work_available(vsmax))
+                        schedule();
+                finish_wait(&slow_work_thread_wq, &wait);
+
+                try_to_freeze();
+
+                vsmax = vslow_work_proportion;
+                vsmax *= atomic_read(&slow_work_thread_count);
+                vsmax /= 100;
+
+                if (slow_work_available(vsmax) && slow_work_execute()) {
+                        cond_resched();
+                        continue;
+                }
+
+                if (slow_work_threads_should_exit)
+                        break;
+        }
+
+        if (atomic_dec_and_test(&slow_work_thread_count))
+                complete_and_exit(&slow_work_last_thread_exited, 0);
+        return 0;
+}
+
+/**
+ * slow_work_register_user - Register a user of the facility
+ *
+ * Register a user of the facility, starting up the initial threads if there
+ * aren't any other users at this point.  This will return 0 if successful, or
+ * an error if not.
+ */
+int slow_work_register_user(void)
+{
+        struct task_struct *p;
+        int loop;
+
+        mutex_lock(&slow_work_user_lock);
+
+        if (slow_work_user_count == 0) {
+                printk(KERN_NOTICE "Slow work thread pool: Starting up\n");
+                init_completion(&slow_work_last_thread_exited);
+
+                slow_work_threads_should_exit = false;
+
+                /* start the minimum number of threads */
+                for (loop = 0; loop < slow_work_min_threads; loop++) {
+                        atomic_inc(&slow_work_thread_count);
+                        p = kthread_run(slow_work_thread, NULL, "kslowd");
+                        if (IS_ERR(p))
+                                goto error;
+                }
+                printk(KERN_NOTICE "Slow work thread pool: Ready\n");
+        }
+
+        slow_work_user_count++;
+        mutex_unlock(&slow_work_user_lock);
+        return 0;
+
+error:
+        if (atomic_dec_and_test(&slow_work_thread_count))
+                complete(&slow_work_last_thread_exited);
+        if (loop > 0) {
+                printk(KERN_ERR "Slow work thread pool:"
+                       " Aborting startup on ENOMEM\n");
+                slow_work_threads_should_exit = true;
+                wake_up_all(&slow_work_thread_wq);
+                wait_for_completion(&slow_work_last_thread_exited);
+                printk(KERN_ERR "Slow work thread pool: Aborted\n");
+        }
+        mutex_unlock(&slow_work_user_lock);
+        return PTR_ERR(p);
+}
+EXPORT_SYMBOL(slow_work_register_user);
+
+/**
+ * slow_work_unregister_user - Unregister a user of the facility
+ *
+ * Unregister a user of the facility, killing all the threads if this was the
+ * last one.
+ */
+void slow_work_unregister_user(void)
+{
+        mutex_lock(&slow_work_user_lock);
+
+        BUG_ON(slow_work_user_count <= 0);
+
+        slow_work_user_count--;
+        if (slow_work_user_count == 0) {
+                printk(KERN_NOTICE "Slow work thread pool: Shutting down\n");
+                slow_work_threads_should_exit = true;
+                wake_up_all(&slow_work_thread_wq);
+                wait_for_completion(&slow_work_last_thread_exited);
+                printk(KERN_NOTICE "Slow work thread pool:"
+                       " Shut down complete\n");
+        }
+
+        mutex_unlock(&slow_work_user_lock);
+}
+EXPORT_SYMBOL(slow_work_unregister_user);
+
+/*
+ * Initialise the slow work facility
+ */
+static int __init init_slow_work(void)
+{
+        unsigned nr_cpus = num_possible_cpus();
+
+        if (nr_cpus > slow_work_max_threads)
+                slow_work_max_threads = nr_cpus;
+        return 0;
+}
+
+subsys_initcall(init_slow_work);