GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-21 14:11:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

fscache: convert operation to use workqueue instead of slow-work

Browse source 
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>
This commit is contained in:
Tejun Heo 2010-07-20 22:09:01 +02:00
parent 8b8edefa2f
commit 8af7c12436
6 changed files with 53 additions and 115 deletions
Download patch file Download diff file Expand all files Collapse all files

37
include/linux/fscache-cache.h
View file

@ -77,18 +77,14 @@ typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
struct fscache_operation {
union {
struct work_struct fast_work; /* record for fast ops */
struct slow_work slow_work; /* record for (very) slow ops */
};
struct work_struct work; /* record for async ops */
struct list_head pend_link; /* link in object->pending_ops */
struct fscache_object *object; /* object to be operated upon */
unsigned long flags;
#define FSCACHE_OP_TYPE 0x000f /* operation type */
#define FSCACHE_OP_FAST 0x0001 /* - fast op, processor may not sleep for disk */
#define FSCACHE_OP_SLOW 0x0002 /* - (very) slow op, processor may sleep for disk */
#define FSCACHE_OP_MYTHREAD 0x0003 /* - processing is done be issuing thread, not pool */
#define FSCACHE_OP_ASYNC 0x0001 /* - async op, processor may sleep for disk */
#define FSCACHE_OP_MYTHREAD 0x0002 /* - processing is done be issuing thread, not pool */
#define FSCACHE_OP_WAITING 4 /* cleared when op is woken */
#define FSCACHE_OP_EXCLUSIVE 5 /* exclusive op, other ops must wait */
#define FSCACHE_OP_DEAD 6 /* op is now dead */
@ -106,7 +102,8 @@ struct fscache_operation {
/* operation releaser */
fscache_operation_release_t release;
#ifdef CONFIG_SLOW_WORK_DEBUG
#ifdef CONFIG_WORKQUEUE_DEBUGFS
struct work_struct put_work; /* work to delay operation put */
const char *name; /* operation name */
const char *state; /* operation state */
#define fscache_set_op_name(OP, N) do { (OP)->name = (N); } while(0)
@ -118,7 +115,7 @@ struct fscache_operation {
};
extern atomic_t fscache_op_debug_id;
extern const struct slow_work_ops fscache_op_slow_work_ops;
extern void fscache_op_work_func(struct work_struct *work);
extern void fscache_enqueue_operation(struct fscache_operation *);
extern void fscache_put_operation(struct fscache_operation *);
@ -129,33 +126,21 @@ extern void fscache_put_operation(struct fscache_operation *);
* @release: The release function to assign
*
* Do basic initialisation of an operation. The caller must still set flags,
* object, either fast_work or slow_work if necessary, and processor if needed.
* object and processor if needed.
*/
static inline void fscache_operation_init(struct fscache_operation *op,
fscache_operation_release_t release)
fscache_operation_processor_t processor,
fscache_operation_release_t release)
{
INIT_WORK(&op->work, fscache_op_work_func);
atomic_set(&op->usage, 1);
op->debug_id = atomic_inc_return(&fscache_op_debug_id);
op->processor = processor;
op->release = release;
INIT_LIST_HEAD(&op->pend_link);
fscache_set_op_state(op, "Init");
}
/**
* fscache_operation_init_slow - Do additional initialisation of a slow op
* @op: The operation to initialise
* @processor: The processor function to assign
*
* Do additional initialisation of an operation as required for slow work.
*/
static inline
void fscache_operation_init_slow(struct fscache_operation *op,
fscache_operation_processor_t processor)
{
op->processor = processor;
slow_work_init(&op->slow_work, &fscache_op_slow_work_ops);
}
/*
* data read operation
*/