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authorTejun Heo <tj@kernel.org>2010-07-20 22:09:01 +0200
committerTejun Heo <tj@kernel.org>2010-07-22 22:58:47 +0200
commit8af7c12436803291c90295259db23d371a7ad9cc (patch)
tree5e75360876ac5783a3e64bd35a1715847d90e9ce /fs/fscache/main.c
parent8b8edefa2fffbff97f9eec8b70e78ae23abad1a0 (diff)
fscache: convert operation to use workqueue instead of slow-work
Make fscache operation to use only workqueue instead of combination of workqueue and slow-work. FSCACHE_OP_SLOW is dropped and FSCACHE_OP_FAST is renamed to FSCACHE_OP_ASYNC and uses newly added fscache_op_wq workqueue to execute op->processor(). fscache_operation_init_slow() is dropped and fscache_operation_init() now takes @processor argument directly. * Unbound workqueue is used. * fscache_retrieval_work() is no longer necessary as OP_ASYNC now does the equivalent thing. * sysctl fscache.operation_max_active added to control concurrency. The default value is nr_cpus clamped between 2 and WQ_UNBOUND_MAX_ACTIVE. * 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>
Diffstat (limited to 'fs/fscache/main.c')
-rw-r--r--fs/fscache/main.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index bb8d4c35c7a..44d13ddab2c 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -42,11 +42,13 @@ MODULE_PARM_DESC(fscache_debug,
struct kobject *fscache_root;
struct workqueue_struct *fscache_object_wq;
+struct workqueue_struct *fscache_op_wq;
DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
/* these values serve as lower bounds, will be adjusted in fscache_init() */
static unsigned fscache_object_max_active = 4;
+static unsigned fscache_op_max_active = 2;
#ifdef CONFIG_SYSCTL
static struct ctl_table_header *fscache_sysctl_header;
@@ -74,6 +76,14 @@ ctl_table fscache_sysctls[] = {
.proc_handler = fscache_max_active_sysctl,
.extra1 = &fscache_object_wq,
},
+ {
+ .procname = "operation_max_active",
+ .data = &fscache_op_max_active,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = fscache_max_active_sysctl,
+ .extra1 = &fscache_op_wq,
+ },
{}
};
@@ -110,6 +120,16 @@ static int __init fscache_init(void)
if (!fscache_object_wq)
goto error_object_wq;
+ fscache_op_max_active =
+ clamp_val(fscache_object_max_active / 2,
+ fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
+
+ ret = -ENOMEM;
+ fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
+ fscache_op_max_active);
+ if (!fscache_op_wq)
+ goto error_op_wq;
+
for_each_possible_cpu(cpu)
init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
@@ -152,6 +172,8 @@ error_sysctl:
#endif
fscache_proc_cleanup();
error_proc:
+ destroy_workqueue(fscache_op_wq);
+error_op_wq:
destroy_workqueue(fscache_object_wq);
error_object_wq:
slow_work_unregister_user(THIS_MODULE);
@@ -172,6 +194,7 @@ static void __exit fscache_exit(void)
kmem_cache_destroy(fscache_cookie_jar);
unregister_sysctl_table(fscache_sysctl_header);
fscache_proc_cleanup();
+ destroy_workqueue(fscache_op_wq);
destroy_workqueue(fscache_object_wq);
slow_work_unregister_user(THIS_MODULE);
printk(KERN_NOTICE "FS-Cache: Unloaded\n");