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[OPTIM] session: don't recheck analysers when buffer flags have not changed

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Analysers were re-evaluated when some flags were still present in the
buffers, even if they had not changed since previous pass, resulting
in a waste of CPU cycles.

Ensuring that the flags have changed has saved some useless calls :

  function            min calls per session (before -> after)

  http_request_forward_body       5 -> 4
  http_response_forward_body      3 -> 2
  http_sync_req_state            10 -> 8
  http_sync_res_state             8 -> 6
  http_resync_states              8 -> 6
This commit is contained in:
Willy Tarreau 2010-11-11 14:28:47 +01:00
parent abe8ea5c1d
commit 2f976e18b8
1 changed files with 5 additions and 5 deletions
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10
src/session.c
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@ -1214,8 +1214,8 @@ struct task *process_session(struct task *t)
s->req->flags &= ~BF_READ_NOEXP;
/* Keep a copy of req/rep flags so that we can detect shutdowns */
rqf_last = s->req->flags;
rpf_last = s->rep->flags;
rqf_last = s->req->flags & ~BF_MASK_ANALYSER;
rpf_last = s->rep->flags & ~BF_MASK_ANALYSER;
/* we don't want the stream interface functions to recursively wake us up */
if (s->req->prod->owner == t)
@ -1364,7 +1364,7 @@ struct task *process_session(struct task *t)
resync_request:
/* Analyse request */
if ((s->req->flags & BF_MASK_ANALYSER) ||
if (((s->req->flags & ~rqf_last) & BF_MASK_ANALYSER) ||
((s->req->flags ^ rqf_last) & BF_MASK_STATIC) ||
s->si[0].state != rq_prod_last ||
s->si[1].state != rq_cons_last) {
@ -1537,7 +1537,7 @@ struct task *process_session(struct task *t)
goto resync_response;
}
}
else if ((s->rep->flags & BF_MASK_ANALYSER) ||
else if (((s->rep->flags & ~rpf_last) & BF_MASK_ANALYSER) ||
(s->rep->flags ^ rpf_last) & BF_MASK_STATIC ||
s->si[0].state != rp_cons_last ||
s->si[1].state != rp_prod_last) {
@ -1627,7 +1627,7 @@ struct task *process_session(struct task *t)
* we're just in a data phase here since it means we have not
* seen any analyser who could set an error status.
*/
if (!(s->flags & SN_ERR_MASK)) {
if (unlikely(!(s->flags & SN_ERR_MASK))) {
if (s->req->flags & (BF_READ_ERROR|BF_READ_TIMEOUT|BF_WRITE_ERROR|BF_WRITE_TIMEOUT)) {
/* Report it if the client got an error or a read timeout expired */
s->req->analysers = 0;