fscache: convert object to use workqueue instead of slow-work
Make fscache object state transition callbacks use workqueue instead of slow-work. New dedicated unbound CPU workqueue fscache_object_wq is created. get/put callbacks are renamed and modified to take @object and called directly from the enqueue wrapper and the work function. While at it, make all open coded instances of get/put to use fscache_get/put_object(). * Unbound workqueue is used. * work_busy() output is printed instead of slow-work flags in object debugging outputs. They mean basically the same thing bit-for-bit. * sysctl fscache.object_max_active added to control concurrency. The default value is nr_cpus clamped between 4 and WQ_UNBOUND_MAX_ACTIVE. * slow_work_sleep_till_thread_needed() is replaced with fscache private implementation fscache_object_sleep_till_congested() which waits on fscache_object_wq congestion. * debugfs support is dropped for now. Tracing API based debug facility is planned to be added. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Tejun Heo
parent
e120153ddf
commit
8b8edefa2f
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@ -343,8 +343,8 @@ This will look something like:
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[root@andromeda ~]# head /proc/fs/fscache/objects
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OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS EM EV F S | NETFS_COOKIE_DEF TY FL NETFS_DATA OBJECT_KEY, AUX_DATA
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======== ======== ==== ===== === === === == ===== == == = = | ================ == == ================ ================
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17e4b 2 ACTV 0 0 0 0 0 0 7b 4 0 8 | NFS.fh DT 0 ffff88001dd82820 010006017edcf8bbc93b43298fdfbe71e50b57b13a172c0117f38472, e567634700000000000000000000000063f2404a000000000000000000000000c9030000000000000000000063f2404a
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1693a 2 ACTV 0 0 0 0 0 0 7b 4 0 8 | NFS.fh DT 0 ffff88002db23380 010006017edcf8bbc93b43298fdfbe71e50b57b1e0162c01a2df0ea6, 420ebc4a000000000000000000000000420ebc4a0000000000000000000000000e1801000000000000000000420ebc4a
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17e4b 2 ACTV 0 0 0 0 0 0 7b 4 0 0 | NFS.fh DT 0 ffff88001dd82820 010006017edcf8bbc93b43298fdfbe71e50b57b13a172c0117f38472, e567634700000000000000000000000063f2404a000000000000000000000000c9030000000000000000000063f2404a
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1693a 2 ACTV 0 0 0 0 0 0 7b 4 0 0 | NFS.fh DT 0 ffff88002db23380 010006017edcf8bbc93b43298fdfbe71e50b57b1e0162c01a2df0ea6, 420ebc4a000000000000000000000000420ebc4a0000000000000000000000000e1801000000000000000000420ebc4a
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where the first set of columns before the '|' describe the object:
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@ -362,7 +362,7 @@ where the first set of columns before the '|' describe the object:
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EM Object's event mask
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EV Events raised on this object
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F Object flags
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S Object slow-work work item flags
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S Object work item busy state mask (1:pending 2:running)
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and the second set of columns describe the object's cookie, if present:
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@ -395,8 +395,8 @@ and the following paired letters:
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w Show objects that don't have pending writes
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R Show objects that have outstanding reads
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r Show objects that don't have outstanding reads
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S Show objects that have slow work queued
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s Show objects that don't have slow work queued
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S Show objects that have work queued
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s Show objects that don't have work queued
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If neither side of a letter pair is given, then both are implied. For example:
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@ -37,9 +37,9 @@ void __cachefiles_printk_object(struct cachefiles_object *object,
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printk(KERN_ERR "%sobject: OBJ%x\n",
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prefix, object->fscache.debug_id);
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printk(KERN_ERR "%sobjstate=%s fl=%lx swfl=%lx ev=%lx[%lx]\n",
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printk(KERN_ERR "%sobjstate=%s fl=%lx wbusy=%x ev=%lx[%lx]\n",
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prefix, fscache_object_states[object->fscache.state],
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object->fscache.flags, object->fscache.work.flags,
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object->fscache.flags, work_busy(&object->fscache.work),
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object->fscache.events,
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object->fscache.event_mask & FSCACHE_OBJECT_EVENTS_MASK);
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printk(KERN_ERR "%sops=%u inp=%u exc=%u\n",
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@ -212,7 +212,7 @@ wait_for_old_object:
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/* if the object we're waiting for is queued for processing,
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* then just put ourselves on the queue behind it */
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if (slow_work_is_queued(&xobject->fscache.work)) {
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if (work_pending(&xobject->fscache.work)) {
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_debug("queue OBJ%x behind OBJ%x immediately",
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object->fscache.debug_id,
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xobject->fscache.debug_id);
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@ -220,8 +220,7 @@ wait_for_old_object:
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}
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/* otherwise we sleep until either the object we're waiting for
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* is done, or the slow-work facility wants the thread back to
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* do other work */
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* is done, or the fscache_object is congested */
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wq = bit_waitqueue(&xobject->flags, CACHEFILES_OBJECT_ACTIVE);
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init_wait(&wait);
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requeue = false;
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@ -229,8 +228,8 @@ wait_for_old_object:
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prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
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if (!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags))
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break;
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requeue = slow_work_sleep_till_thread_needed(
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&object->fscache.work, &timeout);
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requeue = fscache_object_sleep_till_congested(&timeout);
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} while (timeout > 0 && !requeue);
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finish_wait(wq, &wait);
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@ -82,6 +82,13 @@ extern unsigned fscache_defer_lookup;
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extern unsigned fscache_defer_create;
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extern unsigned fscache_debug;
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extern struct kobject *fscache_root;
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extern struct workqueue_struct *fscache_object_wq;
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DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
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static inline bool fscache_object_congested(void)
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{
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return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq);
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}
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extern int fscache_wait_bit(void *);
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extern int fscache_wait_bit_interruptible(void *);
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@ -15,6 +15,7 @@
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#include <linux/sched.h>
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#include <linux/completion.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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MODULE_DESCRIPTION("FS Cache Manager");
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@ -40,22 +41,89 @@ MODULE_PARM_DESC(fscache_debug,
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"FS-Cache debugging mask");
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struct kobject *fscache_root;
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struct workqueue_struct *fscache_object_wq;
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DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
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/* these values serve as lower bounds, will be adjusted in fscache_init() */
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static unsigned fscache_object_max_active = 4;
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#ifdef CONFIG_SYSCTL
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static struct ctl_table_header *fscache_sysctl_header;
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static int fscache_max_active_sysctl(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos)
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{
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struct workqueue_struct **wqp = table->extra1;
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unsigned int *datap = table->data;
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int ret;
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (ret == 0)
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workqueue_set_max_active(*wqp, *datap);
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return ret;
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}
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ctl_table fscache_sysctls[] = {
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{
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.procname = "object_max_active",
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.data = &fscache_object_max_active,
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.maxlen = sizeof(unsigned),
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.mode = 0644,
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.proc_handler = fscache_max_active_sysctl,
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.extra1 = &fscache_object_wq,
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},
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{}
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};
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ctl_table fscache_sysctls_root[] = {
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{
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.procname = "fscache",
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.mode = 0555,
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.child = fscache_sysctls,
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},
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{}
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};
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#endif
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/*
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* initialise the fs caching module
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*/
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static int __init fscache_init(void)
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{
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unsigned int nr_cpus = num_possible_cpus();
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unsigned int cpu;
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int ret;
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ret = slow_work_register_user(THIS_MODULE);
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if (ret < 0)
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goto error_slow_work;
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fscache_object_max_active =
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clamp_val(nr_cpus,
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fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
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ret = -ENOMEM;
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fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
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fscache_object_max_active);
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if (!fscache_object_wq)
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goto error_object_wq;
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for_each_possible_cpu(cpu)
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init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
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ret = fscache_proc_init();
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if (ret < 0)
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goto error_proc;
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#ifdef CONFIG_SYSCTL
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ret = -ENOMEM;
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fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
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if (!fscache_sysctl_header)
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goto error_sysctl;
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#endif
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fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
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sizeof(struct fscache_cookie),
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0,
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@ -78,8 +146,14 @@ static int __init fscache_init(void)
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error_kobj:
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kmem_cache_destroy(fscache_cookie_jar);
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error_cookie_jar:
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#ifdef CONFIG_SYSCTL
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unregister_sysctl_table(fscache_sysctl_header);
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error_sysctl:
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#endif
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fscache_proc_cleanup();
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error_proc:
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destroy_workqueue(fscache_object_wq);
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error_object_wq:
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slow_work_unregister_user(THIS_MODULE);
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error_slow_work:
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return ret;
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@ -96,7 +170,9 @@ static void __exit fscache_exit(void)
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kobject_put(fscache_root);
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kmem_cache_destroy(fscache_cookie_jar);
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unregister_sysctl_table(fscache_sysctl_header);
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fscache_proc_cleanup();
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destroy_workqueue(fscache_object_wq);
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slow_work_unregister_user(THIS_MODULE);
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printk(KERN_NOTICE "FS-Cache: Unloaded\n");
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}
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@ -34,8 +34,8 @@ struct fscache_objlist_data {
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#define FSCACHE_OBJLIST_CONFIG_NOREADS 0x00000200 /* show objects without active reads */
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#define FSCACHE_OBJLIST_CONFIG_EVENTS 0x00000400 /* show objects with events */
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#define FSCACHE_OBJLIST_CONFIG_NOEVENTS 0x00000800 /* show objects without no events */
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#define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with slow work */
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#define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without slow work */
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#define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with work */
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#define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without work */
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u8 buf[512]; /* key and aux data buffer */
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};
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@ -231,12 +231,11 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
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READS, NOREADS);
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FILTER(obj->events & obj->event_mask,
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EVENTS, NOEVENTS);
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FILTER(obj->work.flags & ~(1UL << SLOW_WORK_VERY_SLOW),
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WORK, NOWORK);
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FILTER(work_busy(&obj->work), WORK, NOWORK);
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}
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seq_printf(m,
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"%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %1lx %1lx | ",
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"%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %1lx %1x | ",
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obj->debug_id,
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obj->parent ? obj->parent->debug_id : -1,
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fscache_object_states_short[obj->state],
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@ -249,7 +248,7 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
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obj->event_mask & FSCACHE_OBJECT_EVENTS_MASK,
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obj->events,
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obj->flags,
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obj->work.flags);
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work_busy(&obj->work));
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no_cookie = true;
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keylen = auxlen = 0;
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@ -14,7 +14,6 @@
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#define FSCACHE_DEBUG_LEVEL COOKIE
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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const char *fscache_object_states[FSCACHE_OBJECT__NSTATES] = {
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@ -50,12 +49,8 @@ const char fscache_object_states_short[FSCACHE_OBJECT__NSTATES][5] = {
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[FSCACHE_OBJECT_DEAD] = "DEAD",
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};
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static void fscache_object_slow_work_put_ref(struct slow_work *);
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static int fscache_object_slow_work_get_ref(struct slow_work *);
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static void fscache_object_slow_work_execute(struct slow_work *);
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#ifdef CONFIG_SLOW_WORK_DEBUG
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static void fscache_object_slow_work_desc(struct slow_work *, struct seq_file *);
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#endif
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static int fscache_get_object(struct fscache_object *);
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static void fscache_put_object(struct fscache_object *);
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static void fscache_initialise_object(struct fscache_object *);
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static void fscache_lookup_object(struct fscache_object *);
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static void fscache_object_available(struct fscache_object *);
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@ -64,17 +59,6 @@ static void fscache_withdraw_object(struct fscache_object *);
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static void fscache_enqueue_dependents(struct fscache_object *);
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static void fscache_dequeue_object(struct fscache_object *);
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const struct slow_work_ops fscache_object_slow_work_ops = {
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.owner = THIS_MODULE,
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.get_ref = fscache_object_slow_work_get_ref,
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.put_ref = fscache_object_slow_work_put_ref,
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.execute = fscache_object_slow_work_execute,
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#ifdef CONFIG_SLOW_WORK_DEBUG
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.desc = fscache_object_slow_work_desc,
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#endif
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};
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EXPORT_SYMBOL(fscache_object_slow_work_ops);
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/*
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* we need to notify the parent when an op completes that we had outstanding
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* upon it
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@ -345,7 +329,7 @@ unsupported_event:
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/*
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* execute an object
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*/
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static void fscache_object_slow_work_execute(struct slow_work *work)
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void fscache_object_work_func(struct work_struct *work)
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{
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struct fscache_object *object =
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container_of(work, struct fscache_object, work);
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@ -359,23 +343,9 @@ static void fscache_object_slow_work_execute(struct slow_work *work)
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if (object->events & object->event_mask)
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fscache_enqueue_object(object);
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clear_bit(FSCACHE_OBJECT_EV_REQUEUE, &object->events);
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fscache_put_object(object);
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}
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/*
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* describe an object for slow-work debugging
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*/
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#ifdef CONFIG_SLOW_WORK_DEBUG
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static void fscache_object_slow_work_desc(struct slow_work *work,
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struct seq_file *m)
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{
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struct fscache_object *object =
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container_of(work, struct fscache_object, work);
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seq_printf(m, "FSC: OBJ%x: %s",
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object->debug_id,
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fscache_object_states_short[object->state]);
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}
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#endif
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EXPORT_SYMBOL(fscache_object_work_func);
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/*
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* initialise an object
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@ -393,7 +363,6 @@ static void fscache_initialise_object(struct fscache_object *object)
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_enter("");
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ASSERT(object->cookie != NULL);
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ASSERT(object->cookie->parent != NULL);
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ASSERT(list_empty(&object->work.link));
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if (object->events & ((1 << FSCACHE_OBJECT_EV_ERROR) |
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(1 << FSCACHE_OBJECT_EV_RELEASE) |
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@ -671,10 +640,8 @@ static void fscache_drop_object(struct fscache_object *object)
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object->parent = NULL;
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}
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/* this just shifts the object release to the slow work processor */
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fscache_stat(&fscache_n_cop_put_object);
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object->cache->ops->put_object(object);
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fscache_stat_d(&fscache_n_cop_put_object);
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/* this just shifts the object release to the work processor */
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fscache_put_object(object);
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_leave("");
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}
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@ -758,12 +725,10 @@ void fscache_withdrawing_object(struct fscache_cache *cache,
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}
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/*
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* allow the slow work item processor to get a ref on an object
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* get a ref on an object
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*/
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static int fscache_object_slow_work_get_ref(struct slow_work *work)
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static int fscache_get_object(struct fscache_object *object)
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{
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struct fscache_object *object =
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container_of(work, struct fscache_object, work);
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int ret;
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fscache_stat(&fscache_n_cop_grab_object);
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@ -773,13 +738,10 @@ static int fscache_object_slow_work_get_ref(struct slow_work *work)
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}
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/*
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* allow the slow work item processor to discard a ref on a work item
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* discard a ref on a work item
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*/
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static void fscache_object_slow_work_put_ref(struct slow_work *work)
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static void fscache_put_object(struct fscache_object *object)
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{
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struct fscache_object *object =
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container_of(work, struct fscache_object, work);
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fscache_stat(&fscache_n_cop_put_object);
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object->cache->ops->put_object(object);
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fscache_stat_d(&fscache_n_cop_put_object);
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@ -792,9 +754,49 @@ void fscache_enqueue_object(struct fscache_object *object)
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{
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_enter("{OBJ%x}", object->debug_id);
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slow_work_enqueue(&object->work);
|
||||
if (fscache_get_object(object) >= 0) {
|
||||
wait_queue_head_t *cong_wq =
|
||||
&get_cpu_var(fscache_object_cong_wait);
|
||||
|
||||
if (queue_work(fscache_object_wq, &object->work)) {
|
||||
if (fscache_object_congested())
|
||||
wake_up(cong_wq);
|
||||
} else
|
||||
fscache_put_object(object);
|
||||
|
||||
put_cpu_var(fscache_object_cong_wait);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* fscache_object_sleep_till_congested - Sleep until object wq is congested
|
||||
* @timoutp: Scheduler sleep timeout
|
||||
*
|
||||
* Allow an object handler to sleep until the object workqueue is congested.
|
||||
*
|
||||
* The caller must set up a wake up event before calling this and must have set
|
||||
* the appropriate sleep mode (such as TASK_UNINTERRUPTIBLE) and tested its own
|
||||
* condition before calling this function as no test is made here.
|
||||
*
|
||||
* %true is returned if the object wq is congested, %false otherwise.
|
||||
*/
|
||||
bool fscache_object_sleep_till_congested(signed long *timeoutp)
|
||||
{
|
||||
wait_queue_head_t *cong_wq = &__get_cpu_var(fscache_object_cong_wait);
|
||||
DEFINE_WAIT(wait);
|
||||
|
||||
if (fscache_object_congested())
|
||||
return true;
|
||||
|
||||
add_wait_queue_exclusive(cong_wq, &wait);
|
||||
if (!fscache_object_congested())
|
||||
*timeoutp = schedule_timeout(*timeoutp);
|
||||
finish_wait(cong_wq, &wait);
|
||||
|
||||
return fscache_object_congested();
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(fscache_object_sleep_till_congested);
|
||||
|
||||
/*
|
||||
* enqueue the dependents of an object for metadata-type processing
|
||||
* - the caller must hold the object's lock
|
||||
|
|
@ -819,9 +821,7 @@ static void fscache_enqueue_dependents(struct fscache_object *object)
|
|||
|
||||
/* sort onto appropriate lists */
|
||||
fscache_enqueue_object(dep);
|
||||
fscache_stat(&fscache_n_cop_put_object);
|
||||
dep->cache->ops->put_object(dep);
|
||||
fscache_stat_d(&fscache_n_cop_put_object);
|
||||
fscache_put_object(dep);
|
||||
|
||||
if (!list_empty(&object->dependents))
|
||||
cond_resched_lock(&object->lock);
|
||||
|
|
|
|||
|
|
@ -21,6 +21,7 @@
|
|||
#include <linux/fscache.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/slow-work.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
#define NR_MAXCACHES BITS_PER_LONG
|
||||
|
||||
|
|
@ -389,7 +390,7 @@ struct fscache_object {
|
|||
struct fscache_cache *cache; /* cache that supplied this object */
|
||||
struct fscache_cookie *cookie; /* netfs's file/index object */
|
||||
struct fscache_object *parent; /* parent object */
|
||||
struct slow_work work; /* attention scheduling record */
|
||||
struct work_struct work; /* attention scheduling record */
|
||||
struct list_head dependents; /* FIFO of dependent objects */
|
||||
struct list_head dep_link; /* link in parent's dependents list */
|
||||
struct list_head pending_ops; /* unstarted operations on this object */
|
||||
|
|
@ -411,7 +412,7 @@ extern const char *fscache_object_states[];
|
|||
(test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
|
||||
(obj)->state >= FSCACHE_OBJECT_DYING)
|
||||
|
||||
extern const struct slow_work_ops fscache_object_slow_work_ops;
|
||||
extern void fscache_object_work_func(struct work_struct *work);
|
||||
|
||||
/**
|
||||
* fscache_object_init - Initialise a cache object description
|
||||
|
|
@ -433,7 +434,7 @@ void fscache_object_init(struct fscache_object *object,
|
|||
spin_lock_init(&object->lock);
|
||||
INIT_LIST_HEAD(&object->cache_link);
|
||||
INIT_HLIST_NODE(&object->cookie_link);
|
||||
vslow_work_init(&object->work, &fscache_object_slow_work_ops);
|
||||
INIT_WORK(&object->work, fscache_object_work_func);
|
||||
INIT_LIST_HEAD(&object->dependents);
|
||||
INIT_LIST_HEAD(&object->dep_link);
|
||||
INIT_LIST_HEAD(&object->pending_ops);
|
||||
|
|
@ -534,6 +535,8 @@ extern void fscache_io_error(struct fscache_cache *cache);
|
|||
extern void fscache_mark_pages_cached(struct fscache_retrieval *op,
|
||||
struct pagevec *pagevec);
|
||||
|
||||
extern bool fscache_object_sleep_till_congested(signed long *timeoutp);
|
||||
|
||||
extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
|
||||
const void *data,
|
||||
uint16_t datalen);
|
||||
|
|
|
|||
Reference in New Issue