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author | Attilio Rao <attilio@FreeBSD.org> | 2009-08-13 17:09:45 +0000 |
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committer | Attilio Rao <attilio@FreeBSD.org> | 2009-08-13 17:09:45 +0000 |
commit | dc6fbf65451a86f6c9bc72434dfe3415afac78da (patch) | |
tree | fa01b2cb8792e972d05922a5507e082efa4d4c1d /UPDATING | |
parent | cbb3cb151c7ad5b841955cd91b8caa74f427f0f9 (diff) | |
download | src-dc6fbf65451a86f6c9bc72434dfe3415afac78da.tar.gz src-dc6fbf65451a86f6c9bc72434dfe3415afac78da.zip |
* Completely Remove the option STOP_NMI from the kernel. This option
has proven to have a good effect when entering KDB by using a NMI,
but it completely violates all the good rules about interrupts
disabled while holding a spinlock in other occasions. This can be the
cause of deadlocks on events where a normal IPI_STOP is expected.
* Adds an new IPI called IPI_STOP_HARD on all the supported architectures.
This IPI is responsible for sending a stop message among CPUs using a
privileged channel when disponible. In other cases it just does match a
normal IPI_STOP.
Right now the IPI_STOP_HARD functionality uses a NMI on ia32 and amd64
architectures, while on the other has a normal IPI_STOP effect. It is
responsibility of maintainers to eventually implement an hard stop
when necessary and possible.
* Use the new IPI facility in order to implement a new userend SMP kernel
function called stop_cpus_hard(). That is specular to stop_cpu() but
it does use the privileged channel for the stopping facility.
* Let KDB use the newly introduced function stop_cpus_hard() and leave
stop_cpus() for all the other cases
* Disable interrupts on CPU0 when starting the process of APs suspension.
* Style cleanup and comments adding
This patch should fix the reboot/shutdown deadlocks many users are
constantly reporting on mailing lists.
Please don't forget to update your config file with the STOP_NMI
option removal
Reviewed by: jhb
Tested by: pho, bz, rink
Approved by: re (kib)
Notes
Notes:
svn path=/head/; revision=196196
Diffstat (limited to 'UPDATING')
-rw-r--r-- | UPDATING | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -22,6 +22,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 8.x IS SLOW: to maximize performance. (To disable malloc debugging, run ln -s aj /etc/malloc.conf.) +20090813: + Remove the option STOP_NMI. The default action is now to use NMI + only for KDB via the newly introduced function stop_cpus_hard() + and maintain stop_cpus() to just use a normal IPI_STOP on ia32 + and amd64. + 20090719: Bump the shared library version numbers for all libraries that do not use symbol versioning as part of the 8.0-RELEASE cycle. |