so that we only have to do an ioapic_write() instead of an ioapic_read()
followed by an ioapic_write() every time we mask and unmask level triggered
interrupts. This cuts the execution time for these operations roughly in
half.
Profiled by: Paolo Pisati <p.pisati@oltrelinux.com>
MFC after: 1 week
the user specifies a keyword which is an alias to some other keyword.
E.g.: stat (for state) or pcpu (for %cpu)..
Submitted by: Kostik Belousov
MFC plans: "soon"
wait time for a packet. This allows to:
- Count number of packets received before and after specified
time.
- Shorten time of execution of 'ping -c 1' scripts.
Submitted by: Lytochkin Boris <lytboris gmail.com>
tcp_timewait(). This corrects a bug (or lack of fixing of a bug)
in tcp_input.c:1.295.
Submitted by: Kazuaki Oda <kaakun at highway dot ne dot jp>
MFC after: 3 months
PCI devices apparently was changed from a special deferred trap with TPC
pointing to the membar #Sync following the failing load/store instruction
to a precise trap with TPC pointing to the failing load/store instruction.
Thus remove the check the check whether TPC points to a membar #Sync in
case of a data access trap as it's off-by-one for USIII CPUs and it should
be sufficient to check whether the trap happend while in fasword*() to
properly detect traps caused by peeking/poking. This also corresponds to
what other OSs do. Note that also only the USIIi manual suggests to check
the TPC for such traps while the USII one doesn't (in the public USIII
manual device peeking/poking isn't mentioned at all).
races. This isn't currently necessary for libpthread or libthr, but
without it external threads libraries like the linuxthreads port are
not safe to use.
Reported by: ganbold@micom.mng.net
NULL. We currently do allow this to happen, but may want to remove that
possibility in the future. This case can occur when a socket is left
open after TCP wraps up, and the timewait state is recycled. This will
be cleaned up in the future.
Found by: Kazuaki Oda <kaakun at highway dot ne dot jp>
MFC after: 3 months
recycling for an unrelated filesystem. I really don't like potentially
acquiring giant in the context of a giantless filesystem but there
are reasonable objections to removing the recycling from this path.
Sponsored by: Isilon Systems, Inc.
have to be calculated once per allocator operation.
Make nil const.
Update various comments.
Remove/avoid division where possible.
For the one division operation that remains in the critical path, add a
switch statement that has a case for each small size class, and do division
with a constant divisor in each case. This allows the compiler to generate
optimized code that does not use hardware division [1].
Obtained from: peter [1]
o use atomic operations to fiddle with stopped_cpus and started_cpus.
o disable interrupts while we're waiting to be started.
o remove logic relating to cpustop_restartfunc as it's not used.
PCB in which the context of stopped CPUs is stored. To access this
PCB from KDB, we introduce a new define, called KDB_STOPPEDPCB. The
definition, when present, lives in <machine/kdb.h> and abstracts
where MD code saves the context. Define KDB_STOPPEDPCB on i386,
amd64, alpha and sparc64 in accordance to previous code.
