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dlm: use workqueue for callbacks

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Instead of creating our own kthread (dlm_astd) to deliver
callbacks for all lockspaces, use a per-lockspace workqueue
to deliver the callbacks.  This eliminates complications and
slowdowns from many lockspaces sharing the same thread.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland
2011-04-05 13:16:24 -05:00
parent 883ba74f43
commit 23e8e1aaac
7 changed files with 185 additions and 218 deletions
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9
fs/dlm/dlm_internal.h
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@@ -246,13 +246,15 @@ struct dlm_lkb {
struct list_head lkb_statequeue; /* rsb g/c/w list */
struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
struct list_head lkb_wait_reply; /* waiting for remote reply */
struct list_head lkb_astqueue; /* need ast to be sent */
struct list_head lkb_ownqueue; /* list of locks for a process */
struct list_head lkb_time_list;
ktime_t lkb_timestamp;
ktime_t lkb_wait_time;
unsigned long lkb_timeout_cs;
struct mutex lkb_cb_mutex;
struct work_struct lkb_cb_work;
struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */
struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
struct dlm_callback lkb_last_cast;
struct dlm_callback lkb_last_bast;
@@ -504,8 +506,12 @@ struct dlm_ls {
struct miscdevice ls_device;
struct workqueue_struct *ls_callback_wq;
/* recovery related */
struct mutex ls_cb_mutex;
struct list_head ls_cb_delay; /* save for queue_work later */
struct timer_list ls_timer;
struct task_struct *ls_recoverd_task;
struct mutex ls_recoverd_active;
@@ -542,6 +548,7 @@ struct dlm_ls {
#define LSFL_RCOM_WAIT 4
#define LSFL_UEVENT_WAIT 5
#define LSFL_TIMEWARN 6
#define LSFL_CB_DELAY 7
/* much of this is just saving user space pointers associated with the
lock that we pass back to the user lib with an ast */