above what's used for fast interrupts, only interrupts with the level of
the interrupt which led to calling intr_fast() (which is used with both
fast and ithread interrupts) are blocked while in that function. Thus
intr_fast() can be preempted by a fast interrupt (which are of a higher
level than ithread interrupts) while servicing an ithread interrupt. This
can lead to a stale pointer to the head of the active interrupt requests
list when back in the ithread interrupt invocation of intr_fast(), in turn
resulting in corruption of the interrupt request lists and consequently
in a panic. Solve this be turning off interrupts in intr_fast() before
reading the pointer to the head of the active list rather than after. [1]
- Add a KASSERT in intr_fast() which asserts that ir_func is non-zero before
calling it. [1]
- Increment interrupt stats after calling the handlers rather than before.
This reduces the delay until direct and fast handlers are serviced, in my
testings by 30% on average for the direct tick interrupt handler, in turn
resulting in less clock drift.
PR: 94778 [1]
Submitted by: Andrew Belashov [1]
MFC after: 2 weeks
with a given module_t. I use this in some the MOD_LOAD event handler for
some test kernel modules to ask the kernel linker to look up the linker
sets in my test modules. (I use linker sets to generate the list of
possible events that I then signal to execute via a sysctl. On non-amd64,
ld(8) would resolve the entire linker set, but on amd64 I have to ask the
kernel linker to do it for me, and having the kernel linker do it works on
all archs.)
- Describe msleep() as the primary sleep function now rather than tsleep()
and describe tsleep() and msleep_spin() as variations.
- Try to make the description of msleep() a bit closer to English
(sentences with actual subjects, etc.)
- Document that a priority of 0 now prevents the thread's priority from
being altered.
- Add a history note for wakeup_one().
1900 in network byte order. Use a uint32_t to calculate and send
the time, so that we don't need to know how big ints or longs are.
I used uint32_t instead of int in the patch, on the off chance
someone uses our inetd source on a system that doesnt 32 bit ints.
PR: 95290
Submitted by: Bruce Becker <hostmaster@whois.gts.net>
MFC after: 2 weeks
if the specified priority is zero. This avoids a race where the calling
thread could read a snapshot of it's current priority, then a different
thread could change the first thread's priority, then the original thread
would call sched_prio() inside msleep() undoing the change made by the
second thread. I used a priority of zero as no thread that calls msleep()
or tsleep() should be specifying a priority of zero anyway.
The various places that passed 'curthread->td_priority' or some variant
as the priority now pass 0.
o Implement Solaris-like -z flag: omit lines for devices with no activity.
o iostat.8: describe -x and -z flags, Xr devstat(3), touch .Dd.
PR: mostly bin/68840, with style changes; bin/73327
Submitted by: Dan Nelson, Peter Schuller
Obtained from: NetBSD (a part of man page)
MFC after: 1 month
have not been passed to the h/w yet. This remedies watchdog timeout
of buffered multicast frames in hostap mode.
While here eliminate an extraneous check; ieee80211_beacon_update sets
the tim bit based on ncabq != 0 so there's no reason to check it too.
Noticed by: Christophe Prevotaux
