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Replace tq_work_list and tq_threads in taskq_t

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To lay the ground work for introducing the taskq_dispatch_prealloc()
interface, the tq_work_list and tq_threads fields had to be replaced
with new alternatives in the taskq_t structure.

The tq_threads field was replaced with tq_thread_list. Rather than
storing the pointers to the taskq's kernel threads in an array, they are
now stored as a list. In addition to laying the ground work for the
taskq_dispatch_prealloc() interface, this change could also enable taskq
threads to be dynamically created and destroyed as threads can now be
added and removed to this list relatively easily.

The tq_work_list field was replaced with tq_active_list. Instead of
keeping a list of taskq_ent_t's which are currently being serviced, a
list of taskq_threads currently servicing a taskq_ent_t is kept. This
frees up the taskq_ent_t's tqent_list field when it is being serviced
(i.e. now when a taskq_ent_t is being serviced, it's tqent_list field
will be empty).

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #65
This commit is contained in:
Prakash Surya
2011-12-05 17:32:48 -08:00
committed by Brian Behlendorf
parent 046a70c93b
commit 2c02b71b14
2 changed files with 95 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/taskq.h
+18 -2
View File
@@ -45,6 +45,14 @@
typedef unsigned long taskqid_t;
typedef void (task_func_t)(void *);
typedef struct taskq_ent {
spinlock_t tqent_lock;
struct list_head tqent_list;
taskqid_t tqent_id;
task_func_t *tqent_func;
void *tqent_arg;
} taskq_ent_t;
/*
* Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
* KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly
@@ -61,8 +69,9 @@ typedef void (task_func_t)(void *);
typedef struct taskq {
spinlock_t tq_lock; /* protects taskq_t */
unsigned long tq_lock_flags; /* interrupt state */
struct task_struct **tq_threads; /* thread pointers */
const char *tq_name; /* taskq name */
struct list_head tq_thread_list;/* list of all threads */
struct list_head tq_active_list;/* list of active threads */
int tq_nactive; /* # of active threads */
int tq_nthreads; /* # of total threads */
int tq_pri; /* priority */
@@ -73,13 +82,20 @@ typedef struct taskq {
taskqid_t tq_next_id; /* next pend/work id */
taskqid_t tq_lowest_id; /* lowest pend/work id */
struct list_head tq_free_list; /* free task_t's */
struct list_head tq_work_list; /* work task_t's */
struct list_head tq_pend_list; /* pending task_t's */
struct list_head tq_prio_list; /* priority pending task_t's */
wait_queue_head_t tq_work_waitq; /* new work waitq */
wait_queue_head_t tq_wait_waitq; /* wait waitq */
} taskq_t;
typedef struct taskq_thread {
struct list_head tqt_thread_list;
struct list_head tqt_active_list;
struct task_struct *tqt_thread;
taskq_t *tqt_tq;
taskq_ent_t *tqt_ent;
} taskq_thread_t;
/* Global system-wide dynamic task queue available for all consumers */
extern taskq_t *system_taskq;