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[MEDIUM] slightly optimize the scheduler for non-expirable tasks.

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The non-expirable tasks are now sent to a dedicated wait-queue so that
they do not pollute the other ones anymore. This is a temporary dirty
hack which will go away with the new O(log(n)) scheduler.
This commit is contained in:
willy tarreau 2006-05-02 14:51:00 +02:00
parent dfece23f7d
commit 5e698ef509
1 changed files with 41 additions and 11 deletions
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52
haproxy.c
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@ -733,9 +733,15 @@ void **pool_session = NULL,
struct proxy *proxy = NULL; /* list of all existing proxies */
struct fdtab *fdtab = NULL; /* array of all the file descriptors */
struct task *rq = NULL; /* global run queue */
struct task wait_queue = { /* global wait queue */
prev:LIST_HEAD(wait_queue),
next:LIST_HEAD(wait_queue)
struct task wait_queue[2] = { /* global wait queue */
{
prev:LIST_HEAD(wait_queue[0]), /* expirable tasks */
next:LIST_HEAD(wait_queue[0]),
},
{
prev:LIST_HEAD(wait_queue[1]), /* non-expirable tasks */
next:LIST_HEAD(wait_queue[1]),
},
};
static int totalconn = 0; /* total # of terminated sessions */
@ -1695,7 +1701,31 @@ struct task *task_queue(struct task *task) {
struct task *list = task->wq;
struct task *start_from;
/* first, test if the task was already in a list */
/* This is a very dirty hack to queue non-expirable tasks in another queue
* in order to avoid pulluting the tail of the standard queue. This will go
* away with the new O(log(n)) scheduler anyway.
*/
if (tv_iseternity(&task->expire)) {
/* if the task was queued in the standard wait queue, we must dequeue it */
if (task->prev) {
if (task->wq == LIST_HEAD(wait_queue[1]))
return task;
else {
task_delete(task);
task->prev = NULL;
}
}
list = task->wq = LIST_HEAD(wait_queue[1]);
} else {
/* if the task was queued in the eternity queue, we must dequeue it */
if (task->prev && (task->wq == LIST_HEAD(wait_queue[1]))) {
task_delete(task);
task->prev = NULL;
list = task->wq = LIST_HEAD(wait_queue[0]);
}
}
/* next, test if the task was already in a list */
if (task->prev == NULL) {
// start_from = list;
start_from = list->prev;
@ -3085,7 +3115,7 @@ int event_accept(int fd) {
setsockopt(cfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &one, sizeof(one));
t->next = t->prev = t->rqnext = NULL; /* task not in run queue yet */
t->wq = LIST_HEAD(wait_queue); /* but already has a wait queue assigned */
t->wq = LIST_HEAD(wait_queue[0]); /* but already has a wait queue assigned */
t->state = TASK_IDLE;
t->process = process_session;
t->context = s;
@ -5973,8 +6003,8 @@ int process_runnable_tasks() {
/* look for expired tasks and add them to the run queue.
*/
tnext = ((struct task *)LIST_HEAD(wait_queue))->next;
while ((t = tnext) != LIST_HEAD(wait_queue)) { /* we haven't looped ? */
tnext = ((struct task *)LIST_HEAD(wait_queue[0]))->next;
while ((t = tnext) != LIST_HEAD(wait_queue[0])) { /* we haven't looped ? */
tnext = t->next;
if (t->state & TASK_RUNNING)
continue;
@ -6735,8 +6765,8 @@ void dump(int sig) {
struct task *t, *tnext;
struct session *s;
tnext = ((struct task *)LIST_HEAD(wait_queue))->next;
while ((t = tnext) != LIST_HEAD(wait_queue)) { /* we haven't looped ? */
tnext = ((struct task *)LIST_HEAD(wait_queue[0]))->next;
while ((t = tnext) != LIST_HEAD(wait_queue[0])) { /* we haven't looped ? */
tnext = t->next;
s = t->context;
qfprintf(stderr,"[dump] wq: task %p, still %ld ms, "
@ -8532,7 +8562,7 @@ int readcfgfile(char *file) {
}
t->next = t->prev = t->rqnext = NULL; /* task not in run queue yet */
t->wq = LIST_HEAD(wait_queue); /* but already has a wait queue assigned */
t->wq = LIST_HEAD(wait_queue[0]); /* but already has a wait queue assigned */
t->state = TASK_IDLE;
t->process = process_chk;
t->context = newsrv;
@ -9351,7 +9381,7 @@ static int appsession_task_init(void)
if ((t = pool_alloc(task)) == NULL)
return -1;
t->next = t->prev = t->rqnext = NULL;
t->wq = LIST_HEAD(wait_queue);
t->wq = LIST_HEAD(wait_queue[0]);
t->state = TASK_IDLE;
t->context = NULL;
tv_delayfrom(&t->expire, &now, TBLCHKINT);