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EXP: peers: Use try-lock operations when looping on the updates list

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This commit is contained in:
Christopher Faulet 2025-10-16 11:37:54 +02:00
parent e29863934e
commit c37b14a705
1 changed files with 50 additions and 64 deletions
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114
src/peers.c
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@ -1549,7 +1549,6 @@ int peer_send_teachmsgs(struct appctx *appctx, struct peer *p, struct shared_tab
int ret, new_pushed, use_timed;
int updates_sent = 0;
struct stksess *ts = NULL;
struct mt_list back;
TRACE_ENTER(PEERS_EV_SESS_IO, appctx, p, st);
@ -1562,79 +1561,69 @@ int peer_send_teachmsgs(struct appctx *appctx, struct peer *p, struct shared_tab
/* We force new pushed to 1 to force identifier in update message */
new_pushed = 1;
MT_LIST_FOR_EACH_ENTRY_LOCKED(ts, &st->last->upd, upd, back) {
if (ts == st->end) {
ret = 1; // done
while (1) {
struct mt_list el1, el2;
if (st->last->upd.next == &st->end->upd || st->last->upd.next == &st->table->updates)
break;
if (buffer_almost_full(&appctx->outbuf)) {
applet_have_more_data(appctx);
ret = -1;
break;
}
if (!(p->flags & PEER_F_TEACH_PROCESS) && ts->updt_type != STKSESS_UPDT_LOCAL)
continue;
else if (ts->updt_type != STKSESS_UPDT_LOCAL && ts->updt_type != STKSESS_UPDT_REMOTE)
if (updates_sent >= peers_max_updates_at_once) {
applet_have_more_data(appctx);
ret = -1;
break;
}
el1 = mt_list_try_lock_full(&st->last->upd);
if (el1.prev == NULL) {
applet_have_more_data(appctx);
ret = -1;
break;
}
el2 = mt_list_lock_next(el1.next);
/* el2 = mt_list_try_lock_next(el1.next); */
/* if (el2.next == NULL) { */
/* mt_list_unlock_full(&st->last->upd, el1); */
/* applet_have_more_data(appctx); */
/* ret = -1; */
/* break; */
/* } */
ts = MT_LIST_ELEM(el1.next, typeof(ts), upd);
HA_ATOMIC_INC(&ts->ref_cnt);
mt_list_unlock_full(&st->last->upd, el2);
mt_list_unlock_link(el1);
if ((!(p->flags & PEER_F_TEACH_PROCESS) && ts->updt_type != STKSESS_UPDT_LOCAL) ||
(ts->updt_type != STKSESS_UPDT_LOCAL && ts->updt_type != STKSESS_UPDT_REMOTE) ||
(p->srv->shard && ts->shard != p->srv->shard) ||
ts->updt_type == STKSESS_UPDT_MARKER) {
HA_ATOMIC_DEC(&ts->ref_cnt);
continue;
}
if (st != p->last_local_table) {
ret = peer_send_switchmsg(st, appctx);
if (ret <= 0)
if (ret <= 0) {
HA_ATOMIC_DEC(&ts->ref_cnt);
break;
}
p->last_local_table = st;
}
if (!_HA_ATOMIC_LOAD(&ts->seen))
_HA_ATOMIC_STORE(&ts->seen, 1);
if (p->srv->shard && ts->shard != p->srv->shard)
continue;
if (updates_sent >= peers_max_updates_at_once) {
applet_have_more_data(appctx);
ret = -1;
}
else {
HA_ATOMIC_INC(&ts->ref_cnt);
ret = peer_send_updatemsg(st, appctx, ts, st->update_id, new_pushed, use_timed);
HA_ATOMIC_DEC(&ts->ref_cnt);
}
if (ret <= 0) {
/* Insert <last> marker before <ts> to process it again
* on next iteration. <ts> remains locked
*
* Before:
* <back>: <A> <==============> <C>
*
* <last> <==> ... <A> <==> x x <==> <C> ...
*
* x <==> TS <==> x
*
* <back>.prev == <A> and <back>.prev->next == MT_LIST_BUSY
*
* Step 1: detach <last> from the list
* Step 2: insert <last> after <A>
* - <last>.prev = <A> (or <back>.prev)
* - <last>.next = MT_LIST_BUSY (or <back>.prev->next)
* Step 3: move <A> before <last>
* - <A>.next = <last> (or back.prev->next = <last>)
*
* Step 4: update <back>.prev to point on <last>
*
* After:
* <back>: <last> <==============> <C>
*
* ... <A> <==> <last> <==> x x <==> <C> ...
*
* x <==> TS <==> x
*
*/
MT_LIST_DELETE(&st->last->upd);
st->last->upd.next = back.prev->next; /* == MT_LIST_BUSY */
__ha_barrier_atomic_store();
st->last->upd.prev = back.prev;
back.prev->next = &st->last->upd;
back.prev = &st->last->upd;
ret = peer_send_updatemsg(st, appctx, ts, st->update_id, new_pushed, use_timed);
HA_ATOMIC_DEC(&ts->ref_cnt);
if (ret <= 0)
break;
}
p->last.table = st;
p->last.id = st->update_id;
@ -1647,12 +1636,9 @@ int peer_send_teachmsgs(struct appctx *appctx, struct peer *p, struct shared_tab
updates_sent++;
}
if (ret == 1) {
MT_LIST_DELETE(&st->last->upd);
MT_LIST_APPEND(&st->end->upd, &st->last->upd);
if (ret == 1)
MT_LIST_DELETE(&st->end->upd);
}
end:
TRACE_LEAVE(PEERS_EV_SESS_IO, appctx, p, st);
return ret;
}