requires that the CPU control vector be properly readable. I believe that
all CPUs that have high vector support have a readable CPU control register,
but if we ever encounter one that does not, then we'll have to adjust this
code.
officially have undefined behavior, from returning an error code to raising
an assertion failure.
Also, don't bother to explicitly test for (illegal) null pointers and return
an error; they'll bomb out soon enough.
stopgap measure to make vi recovery mostly functional on non-binary files.
The problem is that the db holding the recovery file can become corrupted,
in which case the data size of the line becomes huge. We use heuristics to
correct the size when we load a db in recovery mode. We could use a slightly
better heuristic (looking for ascii chars before correcting the length),
but it is not worth it. Another way would have been to trap the SEGV and
access data[len] and see if that worked, but that seemed exceedingly ugly.
-G was chosen as SuSv2 specified -g was already used in ls(1), but ls
has no blocksize options like df/du, so this was redundant.
bump date in man page.
Some features of the new pmap are:
- It allows L1 descriptor tables to be shared efficiently between
multiple processes. A typical "maxusers 32" kernel, where NPROC is set
to 532, requires 35 L1s. A "maxusers 2" kernel runs quite happily
with just 4 L1s. This completely solves the problem of running out
of contiguous physical memory for allocating new L1s at runtime on a
busy system.
- Much improved cache/TLB management "smarts". This change ripples
out to encompass the low-level context switch code, which is also
much smarter about when to flush the cache/TLB, and when not to.
- Faster allocation of L2 page tables and associated metadata thanks,
in part, to the pool_cache enhancements recently contributed to
NetBSD by Wasabi Systems.
- Faster VM space teardown due to accurate referenced tracking of L2
page tables.
- Better/faster cache-alias tracking.
The new pmap is enabled by adding options ARM32_PMAP_NEW to the kernel
config file, and making the necessary changes to the port-specific
initarm() function. Several ports have already been converted and will
be committed shortly.
uwe