Date: Tue, 20 Jul 2004 18:42:12 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: Alfred Perlstein <alfred@freebsd.org> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/netinet raw_ip.c Message-ID: <Pine.NEB.3.96L.1040720183934.98217M-100000@fledge.watson.org> In-Reply-To: <20040720223019.GM95729@elvis.mu.org>
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On Tue, 20 Jul 2004, Alfred Perlstein wrote: > * Robert Watson <rwatson@FreeBSD.org> [040720 13:52] wrote: > > rwatson 2004-07-20 20:52:30 UTC > > > > FreeBSD src repository > > > > Modified files: > > sys/netinet raw_ip.c > > Log: > > M_PREPEND() the IP header on to the front of an outgoing raw IP packet > > using M_DONTWAIT rather than M_WAITOK to avoid sleeping on memory > > while holding a mutex. > > Isn't there a call we can add to mget/malloc/zalloc to do this: > > if (flags & _WAIT) > ask_witness_if_we_can_sleep > > deferring to the actual tsleep call will never catch as many. > > If you don't have the time, I may be able to get to this tonight. In my previous e-mail, I think I misunderstood your question. The answer to your question is Yes, but I think that you can also look at adding one to M_PREPEND() since it won't always call into m_prepend(). Sorry for the confusion! Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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