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Re: CVS commit: src/sys
On Fri, Sep 23, 2011 at 05:09:23AM +0000, YAMAMOTO Takashi wrote:
> > Fix the build that was broken by struct lwp *updateproc reference in
> > RUMP-visible code. Instead of checking that updateproc (aka ioflush,
> > aka syncer) will not sleep in PUFFS code, I check for any kernel thread:
> > after all none of them are designed to hang awaiting for a remote filesystem
> > operation to complete.
> i don't think it's a good idea to restrict what kernel threads can do
> in this way. please revert.
Can you imagine a situation where you would expect a kernel thread to
sleep in a VFS call? If you do, then I can propose to add a L_NOWAITFS
flag in struct lwp's l_flags. That way ioflush could be set to avoid
sleeping in PUFFS code while other thread would remain the ability.
Another approach is to add a flag to VOP_STRATEGY so that the caller can
tell the filesystem whether it can wait or not.
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