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dlm: Don't swamp the CPU with callbacks queued during recovery 

Before this patch, recovery would cause all callbacks to be delayed,
put on a queue, and afterward they were all queued to the callback
work queue. This patch does the same thing, but occasionally takes
a break after 25 of them so it won't swamp the CPU at the expense
of other RT processes like corosync.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Bob Peterson 2018-11-08 14:04:50 -05:00 committed by David Teigland
parent 9de30f3f7f
commit 216f0efd19
1 changed files with 10 additions and 0 deletions
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10
fs/dlm/ast.c
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@ -292,6 +292,8 @@ void dlm_callback_suspend(struct dlm_ls *ls)
flush_workqueue(ls->ls_callback_wq);
}
#define MAX_CB_QUEUE 25
void dlm_callback_resume(struct dlm_ls *ls)
{
struct dlm_lkb *lkb, *safe;
@ -302,15 +304,23 @@ void dlm_callback_resume(struct dlm_ls *ls)
if (!ls->ls_callback_wq)
return;
more:
mutex_lock(&ls->ls_cb_mutex);
list_for_each_entry_safe(lkb, safe, &ls->ls_cb_delay, lkb_cb_list) {
list_del_init(&lkb->lkb_cb_list);
queue_work(ls->ls_callback_wq, &lkb->lkb_cb_work);
count++;
if (count == MAX_CB_QUEUE)
break;
}
mutex_unlock(&ls->ls_cb_mutex);
if (count)
log_rinfo(ls, "dlm_callback_resume %d", count);
if (count == MAX_CB_QUEUE) {
count = 0;
cond_resched();
goto more;
}
}