Date: Sat, 16 Feb 2002 23:12:59 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Julian Elischer <julian@elischer.org> Cc: Alfred Perlstein <bright@mu.org>, Poul-Henning Kamp <phk@critter.freebsd.dk>, arch@FreeBSD.ORG, jhb@FreeBSD.ORG, peter@wemm.org, jake@locore.ca Subject: Re: gettimeofday() and crhold()/crfree() (was Re: gettimeofday() Message-ID: <200202170712.g1H7Cxb48783@apollo.backplane.com> References: <200202170654.WAA44493@InterJet.elischer.org>
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:I agree but jhb wants to have it that way... He wants to be able to catch
:anyone accessing the ucred of a thread that is in user space. I
:personally think we should just remove the code.
It makes it rather difficult to work on the Giant pushdown code because
it's going to catch a majority of process blockages, making it difficult
for us to guage the effect of our Giant pushdown work and also making
it difficult to track down what Giant locks are still being obtained.
If John (John?) is going to insist on leaving that code in, then I will
have to commit the Giant-less crfree() code pretty much now to get
around the deficiency.
Now, it may wind up being a good idea to have giant-less crfree() code
anyway, since crfree() is called from the VM system (and NFS, and the
file descriptor code, and the VFS subsystem, and a few other places
deep in the code). It will be rather difficult to get Giant pushed
down into those subsystems without fixing crfree() anyway, but the work
isn't likely to progress that far for a few weeks or a month or two
depending.
-Matt
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