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[MEDIUM] listeners: put listeners in queue upon resource shortage

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When an accept() fails because of a connection limit or a memory shortage,
we now disable it and queue it so that it's dequeued only when a connection
is released. This has improved the behaviour of the process near the fd limit
as now a listener with a no connection (eg: stats) will not loop forever
trying to get its connection accepted.

The solution is still not 100% perfect, as we'd like to have this used when
proxy limits are reached (use a per-proxy list) and for safety, we'd need
to have dedicated tasks to periodically re-enable them (eg: to overcome
temporary system-wide resource limitations when no connection is released).
This commit is contained in:
Willy Tarreau
2011-07-24 22:58:00 +02:00
parent e6ca1fcd84
commit 08ceb1012b
4 changed files with 19 additions and 10 deletions
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src/haproxy.c
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@@ -159,6 +159,8 @@ const struct linger nolinger = { .l_onoff = 1, .l_linger = 0 };
char hostname[MAX_HOSTNAME_LEN];
char localpeer[MAX_HOSTNAME_LEN];
/* list of the temporarily limited listeners because of lack of resource */
struct list global_listener_queue = LIST_HEAD_INIT(global_listener_queue);
/*********************************************************************/
/* general purpose functions ***************************************/