Revert "kernel - Spread IPIs out to more priority levels"

This commit seems to be causing a performance regression on VMs.
Since it didn't fix a particular bug (was just supposed to make
things more

Revert "kernel - Spread IPIs out to more priority levels"

This commit seems to be causing a performance regression on VMs.
Since it didn't fix a particular bug (was just supposed to make
things more robust), revert it for now.

Reported-by: tkusumi

This reverts commit f240042b9f9bcfdacd70499659fcc5f55d5e49ab.

show more ...

kernel - Spread IPIs out to more priority levels

* Due to the brandamaged way the LAPIC queues received IPIs, each
priority level (the top 4 bits of the 8 bit vector) has a 2-entry
FIFO. Bring

kernel - Spread IPIs out to more priority levels

* Due to the brandamaged way the LAPIC queues received IPIs, each
priority level (the top 4 bits of the 8 bit vector) has a 2-entry
FIFO. Bring in comments from FreeBSD on how this works.

* Change our IPI vectors which previously used 2 priority levels to now
use 3 priority levels. Each source is generally limited by an atomic
op to avoid multi-queueing and hopefully that means the above LAPIC hw
queue will never refuse to accept an IPI.

IPIQ and TIMER use group 1

INVLTLB (and INVLPG) uses group 2

SNIFF, CPUSTOP, and SPURIOUSINT use group 3

* Reduces the number of vectors available per cpu by 16, but shouldn't
present that big a problem.

show more ...

kernel - Fix Xinvltlb issue, fix ipiq issue, add Xsniff

* The Xinvltlb IPI interrupt enables interrupts in smp_inval_intr(), which
allows potentially pending interrupts and other things to happen.

kernel - Fix Xinvltlb issue, fix ipiq issue, add Xsniff

* The Xinvltlb IPI interrupt enables interrupts in smp_inval_intr(), which
allows potentially pending interrupts and other things to happen. We
must use doreti instead of doreti_iret.

* Fix a reentrancy issue with lwkt_ipiq. Reentrancy can occur when the ipi
callback itself needs to issue an IPI, but the target cpu FIFO is full.
When this happens, the cpu mask may not be correct so force a scan of all
cpus in this situation.

* Add an infinite loop detection test to lwkt_process_ipiq() and jigger
another IPI if it persists more than 10 seconds, hopefully recovering the
system if as-yet unknown IPI issues persist.

* Add the Xsniff IPI and augment systat -pv to use it. This sniffs the %rip
and %rpc on all cpus, allowing us to see where where the kernel spends its
time.

show more ...

x86_64/timer: Xtimer is generic enough for per-cpu timer.

Remove advertising header from sys/

Correct BSD License clause numbering from 1-2-4 to 1-2-3.

Some less clear cases taken as it was done of FreeBSD.

kernel/x86_64: Remove some bogus #ifndefs.

kernel: Make SMP support default (and non-optional).

The 'SMP' kernel option gets removed with this commit, so it has to
be removed from everybody's configs.

Reviewed-by: sjg
Approved-by: many

intr/x86_64: Define IDT_HWI_VECTORS

This macro defines how many IDT vectors that could be setup as hardware
interrupts. Use this macro instead of MAX_HARDINTS and APIC_INTMAPSIZE.

x86_64: Allow UP kernel to use LAPIC timer and I/O APIC

x86_64: Remove no longer used interrupt vector declaration

pc64: Split out isa_intr.h and move isa/intr_machdep.h to include/

amd64: Big batch of SMP changes.

AMD64 - Sync AMD64 support from Jordan Gordeev's svn repository and
Google SOC project. This work is still continuing but represents
substantial progress in the effort.

With this commit the world b

AMD64 - Sync AMD64 support from Jordan Gordeev's svn repository and
Google SOC project. This work is still continuing but represents
substantial progress in the effort.

With this commit the world builds and installs, the loader is able to
boot the kernel, and the kernel is able to initialize, probe devices, and
exec the init program. The init program is then able to run until it hits
its first fork(). For the purposes of the GSOC the project is being
considered a big success!

The code has been adapted from multiple sources, most notably Peter Wemm
and other peoples work from FreeBSD, with many modifications to make it
work with DragonFly. Also thanks go to Simon Schubert for working on gdb
and compiler issues, and to Noah Yan for a good chunk of precursor work
in 2007.

While Jordan wishes to be modest on his contribution, frankly we would
not have been able to make this much progress without the large number
of man-hours Jordan has dedicated to his GSOC project painstakingly gluing
code together, tracking down issues, and progressing the boot sequence.

Submitted-by: Jordan Gordeev <jgordeev@dir.bg>

show more ...

More headers for pc64 platform kernel build/linking