Date: Sat, 22 Mar 2008 13:51:45 +0300 From: Ruslan Ermilov <ru@FreeBSD.org> To: arch@FreeBSD.org Subject: Disposal of a misleading M_TRYWAIT Message-ID: <20080322105145.GA41672@team.vega.ru>
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I'd like to remove the misleading uses of M_TRYWAIT throughout the tree and clean up some dead code that assumes its original behavior (that it could return NULL). Since the advent of MBUMA in FreeBSD (whatever), M_TRYWAIT has meant M_WAITOK. (The reason for M_TRYWAIT itself was that an original mbuf's M_WAIT could return NULL.) There is little or no sign that this will change, and there are lots of consumers that already pass M_WAITOK to mbuf allocator routines and rely on its invariants, so support for the concept of M_TRYWAIT has rotted and would have to be re-written anyway if reintroduced. http://people.freebsd.org/~ru/patches/M_TRYWAIT.patch Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer
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