Re: [PATCH] per-user signal pending and message queue limits

From: Manfred Spraul
Date: Tue Apr 20 2004 - 13:08:03 EST

Marcelo Tosatti wrote:

Indeed, it seems more correct to account for something else than "nr of message queues".

Memory occupied sounds better, yeap?

I agree, but note that there is one hidden problem:
There can be one notification for each registered message queue. If there are more than ~560 queues and one process wants to install SIGEV_THREAD notification handlers for all of them, then the netfilter code will run against the socket rmem limit and mq_notify will block.
_If_ there are users that do that we'll have to bypass the normal sk_rmem_alloc and add an mqueue specific limit.


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