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check the return value.
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(the powerhooks were always run in reverse order).
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Use FOREACH macros instead of walking the list manually.
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flags (much nicer for future smp work).
Add two generic functions yield() and preempt(). Use preepmt() in uio when
we are told to yield.
Based on my idea, code written by Jason Thorpe from NetBSD.
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giving other processes a chance to run.
A process feeding a huge buffer to {read,write}{,v} on a file that doesn't
need to wait for I/O, could have hogged a lot of cpu in the kernel, blocking
all userland activity.
Based on a similiar fix in FreeBSD.
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from NetBSD, Sat Jun 26 08:25:25 1999 UTC by augustss:
Add powerhooks, i.e., the ability to register a function that will be
called when the machine does a suspend or resume.
XXX Will go away when Jason's kevents come to life.
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Add an extra flag to hashinit telling if it should wait in malloc.
update all calls to hashinit.
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arg for passing to malloc() (hashinit always uses M_WAITOK which is not
always what you want). Everything that uses hashinit should really
get converted to newhashinit and then newhashinit can be renamed.
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(size_t) and don't return EINVAL if it is < 0 in sys_{read,write}. Remove check for uio_resid < 0 uiomove() now that uio_resid is unsigned and brack remaining panics with #ifdef DIAGNOSTIC. vn_rdwr() must now take a size_t * as its 9th argument so change that and clean up uses of vn_rdwr(). Fixes 549 + more
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Do sync in the order of umount (vfs_syscals.c), as it was pointed
by someone in NetBSD's lists.
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