mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 01:40:30 +00:00
Merge branch 'for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue updates from Tejun Heo: - make kworkers report the workqueue it is executing or has executed most recently in /proc/PID/comm (so they show up in ps/top) - CONFIG_SMP shuffle to move stuff which isn't necessary for UP builds inside CONFIG_SMP. * 'for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: workqueue: move function definitions within CONFIG_SMP block workqueue: Make sure struct worker is accessible for wq_worker_comm() workqueue: Show the latest workqueue name in /proc/PID/{comm,stat,status} proc: Consolidate task->comm formatting into proc_task_name() workqueue: Set worker->desc to workqueue name by default workqueue: Make worker_attach/detach_pool() update worker->pool workqueue: Replace pool->attach_mutex with global wq_pool_attach_mutex
This commit is contained in:
commit
af6c5d5e01
@ -96,22 +96,29 @@
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#include <asm/processor.h>
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#include "internal.h"
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static inline void task_name(struct seq_file *m, struct task_struct *p)
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void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
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{
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char *buf;
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size_t size;
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char tcomm[sizeof(p->comm)];
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char tcomm[64];
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int ret;
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get_task_comm(tcomm, p);
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seq_puts(m, "Name:\t");
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if (p->flags & PF_WQ_WORKER)
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wq_worker_comm(tcomm, sizeof(tcomm), p);
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else
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__get_task_comm(tcomm, sizeof(tcomm), p);
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size = seq_get_buf(m, &buf);
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ret = string_escape_str(tcomm, buf, size, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
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seq_commit(m, ret < size ? ret : -1);
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if (escape) {
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ret = string_escape_str(tcomm, buf, size,
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ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
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if (ret >= size)
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ret = -1;
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} else {
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ret = strscpy(buf, tcomm, size);
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}
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seq_putc(m, '\n');
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seq_commit(m, ret);
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}
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/*
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@ -390,7 +397,10 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
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{
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struct mm_struct *mm = get_task_mm(task);
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task_name(m, task);
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seq_puts(m, "Name:\t");
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proc_task_name(m, task, true);
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seq_putc(m, '\n');
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task_state(m, ns, pid, task);
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if (mm) {
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@ -425,7 +435,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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u64 cutime, cstime, utime, stime;
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u64 cgtime, gtime;
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unsigned long rsslim = 0;
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char tcomm[sizeof(task->comm)];
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unsigned long flags;
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state = *get_task_state(task);
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@ -452,8 +461,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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}
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}
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get_task_comm(tcomm, task);
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sigemptyset(&sigign);
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sigemptyset(&sigcatch);
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cutime = cstime = utime = stime = 0;
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@ -520,7 +527,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
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seq_puts(m, " (");
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seq_puts(m, tcomm);
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proc_task_name(m, task, false);
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seq_puts(m, ") ");
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seq_putc(m, state);
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seq_put_decimal_ll(m, " ", ppid);
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|
@ -1563,9 +1563,8 @@ static int comm_show(struct seq_file *m, void *v)
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if (!p)
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return -ESRCH;
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task_lock(p);
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seq_printf(m, "%s\n", p->comm);
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task_unlock(p);
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proc_task_name(m, p, false);
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seq_putc(m, '\n');
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put_task_struct(p);
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|
@ -136,6 +136,8 @@ unsigned name_to_int(const struct qstr *qstr);
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*/
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extern const struct file_operations proc_tid_children_operations;
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extern void proc_task_name(struct seq_file *m, struct task_struct *p,
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bool escape);
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extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
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struct pid *, struct task_struct *);
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extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
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|
@ -494,6 +494,7 @@ extern unsigned int work_busy(struct work_struct *work);
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extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
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extern void print_worker_info(const char *log_lvl, struct task_struct *task);
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extern void show_workqueue_state(void);
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extern void wq_worker_comm(char *buf, size_t size, struct task_struct *task);
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|
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/**
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* queue_work - queue work on a workqueue
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|
@ -66,7 +66,7 @@ enum {
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* be executing on any CPU. The pool behaves as an unbound one.
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*
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* Note that DISASSOCIATED should be flipped only while holding
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* attach_mutex to avoid changing binding state while
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* wq_pool_attach_mutex to avoid changing binding state while
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* worker_attach_to_pool() is in progress.
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*/
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POOL_MANAGER_ACTIVE = 1 << 0, /* being managed */
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@ -123,7 +123,7 @@ enum {
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* cpu or grabbing pool->lock is enough for read access. If
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* POOL_DISASSOCIATED is set, it's identical to L.
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*
|
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* A: pool->attach_mutex protected.
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* A: wq_pool_attach_mutex protected.
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*
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* PL: wq_pool_mutex protected.
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||||
*
|
||||
@ -166,7 +166,6 @@ struct worker_pool {
|
||||
/* L: hash of busy workers */
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struct worker *manager; /* L: purely informational */
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struct mutex attach_mutex; /* attach/detach exclusion */
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struct list_head workers; /* A: attached workers */
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struct completion *detach_completion; /* all workers detached */
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@ -297,6 +296,7 @@ static bool wq_numa_enabled; /* unbound NUMA affinity enabled */
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static struct workqueue_attrs *wq_update_unbound_numa_attrs_buf;
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static DEFINE_MUTEX(wq_pool_mutex); /* protects pools and workqueues list */
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static DEFINE_MUTEX(wq_pool_attach_mutex); /* protects worker attach/detach */
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static DEFINE_SPINLOCK(wq_mayday_lock); /* protects wq->maydays list */
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static DECLARE_WAIT_QUEUE_HEAD(wq_manager_wait); /* wait for manager to go away */
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@ -399,14 +399,14 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
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* @worker: iteration cursor
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* @pool: worker_pool to iterate workers of
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*
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* This must be called with @pool->attach_mutex.
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* This must be called with wq_pool_attach_mutex.
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*
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* The if/else clause exists only for the lockdep assertion and can be
|
||||
* ignored.
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*/
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#define for_each_pool_worker(worker, pool) \
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list_for_each_entry((worker), &(pool)->workers, node) \
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if (({ lockdep_assert_held(&pool->attach_mutex); false; })) { } \
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if (({ lockdep_assert_held(&wq_pool_attach_mutex); false; })) { } \
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else
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/**
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@ -1724,7 +1724,7 @@ static struct worker *alloc_worker(int node)
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static void worker_attach_to_pool(struct worker *worker,
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struct worker_pool *pool)
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{
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mutex_lock(&pool->attach_mutex);
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mutex_lock(&wq_pool_attach_mutex);
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/*
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* set_cpus_allowed_ptr() will fail if the cpumask doesn't have any
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@ -1733,37 +1733,40 @@ static void worker_attach_to_pool(struct worker *worker,
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set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);
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/*
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* The pool->attach_mutex ensures %POOL_DISASSOCIATED remains
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* stable across this function. See the comments above the
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* flag definition for details.
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* The wq_pool_attach_mutex ensures %POOL_DISASSOCIATED remains
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* stable across this function. See the comments above the flag
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* definition for details.
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*/
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if (pool->flags & POOL_DISASSOCIATED)
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worker->flags |= WORKER_UNBOUND;
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list_add_tail(&worker->node, &pool->workers);
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worker->pool = pool;
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mutex_unlock(&pool->attach_mutex);
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mutex_unlock(&wq_pool_attach_mutex);
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}
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/**
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* worker_detach_from_pool() - detach a worker from its pool
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* @worker: worker which is attached to its pool
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* @pool: the pool @worker is attached to
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*
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* Undo the attaching which had been done in worker_attach_to_pool(). The
|
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* caller worker shouldn't access to the pool after detached except it has
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* other reference to the pool.
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*/
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static void worker_detach_from_pool(struct worker *worker,
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struct worker_pool *pool)
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static void worker_detach_from_pool(struct worker *worker)
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{
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struct worker_pool *pool = worker->pool;
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struct completion *detach_completion = NULL;
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mutex_lock(&pool->attach_mutex);
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mutex_lock(&wq_pool_attach_mutex);
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list_del(&worker->node);
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worker->pool = NULL;
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|
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if (list_empty(&pool->workers))
|
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detach_completion = pool->detach_completion;
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mutex_unlock(&pool->attach_mutex);
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mutex_unlock(&wq_pool_attach_mutex);
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|
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/* clear leftover flags without pool->lock after it is detached */
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worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);
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@ -1799,7 +1802,6 @@ static struct worker *create_worker(struct worker_pool *pool)
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if (!worker)
|
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goto fail;
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|
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worker->pool = pool;
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worker->id = id;
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|
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if (pool->cpu >= 0)
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@ -2086,6 +2088,12 @@ __acquires(&pool->lock)
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worker->current_pwq = pwq;
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work_color = get_work_color(work);
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|
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/*
|
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* Record wq name for cmdline and debug reporting, may get
|
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* overridden through set_worker_desc().
|
||||
*/
|
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strscpy(worker->desc, pwq->wq->name, WORKER_DESC_LEN);
|
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|
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list_del_init(&work->entry);
|
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|
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/*
|
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@ -2181,7 +2189,6 @@ __acquires(&pool->lock)
|
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worker->current_work = NULL;
|
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worker->current_func = NULL;
|
||||
worker->current_pwq = NULL;
|
||||
worker->desc_valid = false;
|
||||
pwq_dec_nr_in_flight(pwq, work_color);
|
||||
}
|
||||
|
||||
@ -2206,6 +2213,16 @@ static void process_scheduled_works(struct worker *worker)
|
||||
}
|
||||
}
|
||||
|
||||
static void set_pf_worker(bool val)
|
||||
{
|
||||
mutex_lock(&wq_pool_attach_mutex);
|
||||
if (val)
|
||||
current->flags |= PF_WQ_WORKER;
|
||||
else
|
||||
current->flags &= ~PF_WQ_WORKER;
|
||||
mutex_unlock(&wq_pool_attach_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
* worker_thread - the worker thread function
|
||||
* @__worker: self
|
||||
@ -2224,7 +2241,7 @@ static int worker_thread(void *__worker)
|
||||
struct worker_pool *pool = worker->pool;
|
||||
|
||||
/* tell the scheduler that this is a workqueue worker */
|
||||
worker->task->flags |= PF_WQ_WORKER;
|
||||
set_pf_worker(true);
|
||||
woke_up:
|
||||
spin_lock_irq(&pool->lock);
|
||||
|
||||
@ -2232,11 +2249,11 @@ woke_up:
|
||||
if (unlikely(worker->flags & WORKER_DIE)) {
|
||||
spin_unlock_irq(&pool->lock);
|
||||
WARN_ON_ONCE(!list_empty(&worker->entry));
|
||||
worker->task->flags &= ~PF_WQ_WORKER;
|
||||
set_pf_worker(false);
|
||||
|
||||
set_task_comm(worker->task, "kworker/dying");
|
||||
ida_simple_remove(&pool->worker_ida, worker->id);
|
||||
worker_detach_from_pool(worker, pool);
|
||||
worker_detach_from_pool(worker);
|
||||
kfree(worker);
|
||||
return 0;
|
||||
}
|
||||
@ -2335,7 +2352,7 @@ static int rescuer_thread(void *__rescuer)
|
||||
* Mark rescuer as worker too. As WORKER_PREP is never cleared, it
|
||||
* doesn't participate in concurrency management.
|
||||
*/
|
||||
rescuer->task->flags |= PF_WQ_WORKER;
|
||||
set_pf_worker(true);
|
||||
repeat:
|
||||
set_current_state(TASK_IDLE);
|
||||
|
||||
@ -2367,7 +2384,6 @@ repeat:
|
||||
worker_attach_to_pool(rescuer, pool);
|
||||
|
||||
spin_lock_irq(&pool->lock);
|
||||
rescuer->pool = pool;
|
||||
|
||||
/*
|
||||
* Slurp in all works issued via this workqueue and
|
||||
@ -2417,10 +2433,9 @@ repeat:
|
||||
if (need_more_worker(pool))
|
||||
wake_up_worker(pool);
|
||||
|
||||
rescuer->pool = NULL;
|
||||
spin_unlock_irq(&pool->lock);
|
||||
|
||||
worker_detach_from_pool(rescuer, pool);
|
||||
worker_detach_from_pool(rescuer);
|
||||
|
||||
spin_lock_irq(&wq_mayday_lock);
|
||||
}
|
||||
@ -2429,7 +2444,7 @@ repeat:
|
||||
|
||||
if (should_stop) {
|
||||
__set_current_state(TASK_RUNNING);
|
||||
rescuer->task->flags &= ~PF_WQ_WORKER;
|
||||
set_pf_worker(false);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -3271,7 +3286,6 @@ static int init_worker_pool(struct worker_pool *pool)
|
||||
|
||||
timer_setup(&pool->mayday_timer, pool_mayday_timeout, 0);
|
||||
|
||||
mutex_init(&pool->attach_mutex);
|
||||
INIT_LIST_HEAD(&pool->workers);
|
||||
|
||||
ida_init(&pool->worker_ida);
|
||||
@ -3354,10 +3368,10 @@ static void put_unbound_pool(struct worker_pool *pool)
|
||||
WARN_ON(pool->nr_workers || pool->nr_idle);
|
||||
spin_unlock_irq(&pool->lock);
|
||||
|
||||
mutex_lock(&pool->attach_mutex);
|
||||
mutex_lock(&wq_pool_attach_mutex);
|
||||
if (!list_empty(&pool->workers))
|
||||
pool->detach_completion = &detach_completion;
|
||||
mutex_unlock(&pool->attach_mutex);
|
||||
mutex_unlock(&wq_pool_attach_mutex);
|
||||
|
||||
if (pool->detach_completion)
|
||||
wait_for_completion(pool->detach_completion);
|
||||
@ -4347,7 +4361,6 @@ void set_worker_desc(const char *fmt, ...)
|
||||
va_start(args, fmt);
|
||||
vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);
|
||||
va_end(args);
|
||||
worker->desc_valid = true;
|
||||
}
|
||||
}
|
||||
|
||||
@ -4371,7 +4384,6 @@ void print_worker_info(const char *log_lvl, struct task_struct *task)
|
||||
char desc[WORKER_DESC_LEN] = { };
|
||||
struct pool_workqueue *pwq = NULL;
|
||||
struct workqueue_struct *wq = NULL;
|
||||
bool desc_valid = false;
|
||||
struct worker *worker;
|
||||
|
||||
if (!(task->flags & PF_WQ_WORKER))
|
||||
@ -4384,22 +4396,18 @@ void print_worker_info(const char *log_lvl, struct task_struct *task)
|
||||
worker = kthread_probe_data(task);
|
||||
|
||||
/*
|
||||
* Carefully copy the associated workqueue's workfn and name. Keep
|
||||
* the original last '\0' in case the original contains garbage.
|
||||
* Carefully copy the associated workqueue's workfn, name and desc.
|
||||
* Keep the original last '\0' in case the original is garbage.
|
||||
*/
|
||||
probe_kernel_read(&fn, &worker->current_func, sizeof(fn));
|
||||
probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));
|
||||
probe_kernel_read(&wq, &pwq->wq, sizeof(wq));
|
||||
probe_kernel_read(name, wq->name, sizeof(name) - 1);
|
||||
|
||||
/* copy worker description */
|
||||
probe_kernel_read(&desc_valid, &worker->desc_valid, sizeof(desc_valid));
|
||||
if (desc_valid)
|
||||
probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
|
||||
probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
|
||||
|
||||
if (fn || name[0] || desc[0]) {
|
||||
printk("%sWorkqueue: %s %pf", log_lvl, name, fn);
|
||||
if (desc[0])
|
||||
if (strcmp(name, desc))
|
||||
pr_cont(" (%s)", desc);
|
||||
pr_cont("\n");
|
||||
}
|
||||
@ -4579,6 +4587,47 @@ void show_workqueue_state(void)
|
||||
rcu_read_unlock_sched();
|
||||
}
|
||||
|
||||
/* used to show worker information through /proc/PID/{comm,stat,status} */
|
||||
void wq_worker_comm(char *buf, size_t size, struct task_struct *task)
|
||||
{
|
||||
int off;
|
||||
|
||||
/* always show the actual comm */
|
||||
off = strscpy(buf, task->comm, size);
|
||||
if (off < 0)
|
||||
return;
|
||||
|
||||
/* stabilize PF_WQ_WORKER and worker pool association */
|
||||
mutex_lock(&wq_pool_attach_mutex);
|
||||
|
||||
if (task->flags & PF_WQ_WORKER) {
|
||||
struct worker *worker = kthread_data(task);
|
||||
struct worker_pool *pool = worker->pool;
|
||||
|
||||
if (pool) {
|
||||
spin_lock_irq(&pool->lock);
|
||||
/*
|
||||
* ->desc tracks information (wq name or
|
||||
* set_worker_desc()) for the latest execution. If
|
||||
* current, prepend '+', otherwise '-'.
|
||||
*/
|
||||
if (worker->desc[0] != '\0') {
|
||||
if (worker->current_work)
|
||||
scnprintf(buf + off, size - off, "+%s",
|
||||
worker->desc);
|
||||
else
|
||||
scnprintf(buf + off, size - off, "-%s",
|
||||
worker->desc);
|
||||
}
|
||||
spin_unlock_irq(&pool->lock);
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&wq_pool_attach_mutex);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
/*
|
||||
* CPU hotplug.
|
||||
*
|
||||
@ -4600,7 +4649,7 @@ static void unbind_workers(int cpu)
|
||||
struct worker *worker;
|
||||
|
||||
for_each_cpu_worker_pool(pool, cpu) {
|
||||
mutex_lock(&pool->attach_mutex);
|
||||
mutex_lock(&wq_pool_attach_mutex);
|
||||
spin_lock_irq(&pool->lock);
|
||||
|
||||
/*
|
||||
@ -4616,7 +4665,7 @@ static void unbind_workers(int cpu)
|
||||
pool->flags |= POOL_DISASSOCIATED;
|
||||
|
||||
spin_unlock_irq(&pool->lock);
|
||||
mutex_unlock(&pool->attach_mutex);
|
||||
mutex_unlock(&wq_pool_attach_mutex);
|
||||
|
||||
/*
|
||||
* Call schedule() so that we cross rq->lock and thus can
|
||||
@ -4657,7 +4706,7 @@ static void rebind_workers(struct worker_pool *pool)
|
||||
{
|
||||
struct worker *worker;
|
||||
|
||||
lockdep_assert_held(&pool->attach_mutex);
|
||||
lockdep_assert_held(&wq_pool_attach_mutex);
|
||||
|
||||
/*
|
||||
* Restore CPU affinity of all workers. As all idle workers should
|
||||
@ -4727,7 +4776,7 @@ static void restore_unbound_workers_cpumask(struct worker_pool *pool, int cpu)
|
||||
static cpumask_t cpumask;
|
||||
struct worker *worker;
|
||||
|
||||
lockdep_assert_held(&pool->attach_mutex);
|
||||
lockdep_assert_held(&wq_pool_attach_mutex);
|
||||
|
||||
/* is @cpu allowed for @pool? */
|
||||
if (!cpumask_test_cpu(cpu, pool->attrs->cpumask))
|
||||
@ -4762,14 +4811,14 @@ int workqueue_online_cpu(unsigned int cpu)
|
||||
mutex_lock(&wq_pool_mutex);
|
||||
|
||||
for_each_pool(pool, pi) {
|
||||
mutex_lock(&pool->attach_mutex);
|
||||
mutex_lock(&wq_pool_attach_mutex);
|
||||
|
||||
if (pool->cpu == cpu)
|
||||
rebind_workers(pool);
|
||||
else if (pool->cpu < 0)
|
||||
restore_unbound_workers_cpumask(pool, cpu);
|
||||
|
||||
mutex_unlock(&pool->attach_mutex);
|
||||
mutex_unlock(&wq_pool_attach_mutex);
|
||||
}
|
||||
|
||||
/* update NUMA affinity of unbound workqueues */
|
||||
@ -4799,8 +4848,6 @@ int workqueue_offline_cpu(unsigned int cpu)
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
struct work_for_cpu {
|
||||
struct work_struct work;
|
||||
long (*fn)(void *);
|
||||
|
@ -31,13 +31,12 @@ struct worker {
|
||||
struct work_struct *current_work; /* L: work being processed */
|
||||
work_func_t current_func; /* L: current_work's fn */
|
||||
struct pool_workqueue *current_pwq; /* L: current_work's pwq */
|
||||
bool desc_valid; /* ->desc is valid */
|
||||
struct list_head scheduled; /* L: scheduled works */
|
||||
|
||||
/* 64 bytes boundary on 64bit, 32 on 32bit */
|
||||
|
||||
struct task_struct *task; /* I: worker task */
|
||||
struct worker_pool *pool; /* I: the associated pool */
|
||||
struct worker_pool *pool; /* A: the associated pool */
|
||||
/* L: for rescuers */
|
||||
struct list_head node; /* A: anchored at pool->workers */
|
||||
/* A: runs through worker->node */
|
||||
|
Loading…
Reference in New Issue
Block a user