Date: Fri, 10 Dec 2010 15:40:09 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Lev Serebryakov <lev@serebryakov.spb.ru> Cc: freebsd-geom@freebsd.org Subject: Re: One more question: is here any way to know is consumer busy or not? Message-ID: <56017.1291995609@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 10 Dec 2010 18:33:22 %2B0300." <1136849868.20101210183322@serebryakov.spb.ru>
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In message <1136849868.20101210183322@serebryakov.spb.ru>, Lev Serebryakov writ es: >Hello, Freebsd-geom. > > The same idea about pre-reading in case of providers with multiple > consumers (BTW, I think that terminology here is swapped): The provider offers access to a disk(-like) device, which the consumer can use. > looks good to issue pre-read only if target consumer is idle. Is > here any way to determine that? you can look at the nstart and nend elements of the g_consumer structure to tell how many outstanding requests there are on that consumer. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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