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302372 |
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06-Jul-2016 |
nwhitehorn |
Replace a number of conflations of mp_ncpus and mp_maxid with either mp_maxid or CPU_FOREACH() as appropriate. This fixes a number of places in the kernel that assumed CPU IDs are dense in [0, mp_ncpus) and would try, for example, to run tasks on CPUs that did not exist or to allocate too few buffers on systems with sparse CPU IDs in which there are holes in the range and mp_maxid > mp_ncpus. Such circumstances generally occur on systems with SMT, but on which SMT is disabled. This patch restores system operation at least on POWER8 systems configured in this way.
There are a number of other places in the kernel with potential problems in these situations, but where sparse CPU IDs are not currently known to occur, mostly in the ARM machine-dependent code. These will be fixed in a follow-up commit after the stable/11 branch.
PR: kern/210106 Reviewed by: jhb Approved by: re (glebius)
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285715 |
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20-Jul-2015 |
ed |
Add an API for easily creating userspace threads in kernelspace.
This change refactors the existing create_thread() function to be more generic. It replaces almost all of its arguments by a callback that can be used to extract the thread ID and copy it out to the right place, but also to perform additional initialization steps, such as setting the trapframe. This also makes the difference between thr_new() and thr_create() more clear in my opinion.
This function is going to be used by the CloudABI compatibility layer.
It looks like the OpenSolaris compatibility framework already provides a function called thread_create(). Rename this function to do_thread_create() and use a macro to deal with the namespacing conflict. A similar approach is already used for thread_exit().
MFC after: 1 month
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185029 |
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17-Nov-2008 |
pjd |
Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes.
This bring huge amount of changes, I'll enumerate only user-visible changes:
- Delegated Administration
Allows regular users to perform ZFS operations, like file system creation, snapshot creation, etc.
- L2ARC
Level 2 cache for ZFS - allows to use additional disks for cache. Huge performance improvements mostly for random read of mostly static content.
- slog
Allow to use additional disks for ZFS Intent Log to speed up operations like fsync(2).
- vfs.zfs.super_owner
Allows regular users to perform privileged operations on files stored on ZFS file systems owned by him. Very careful with this one.
- chflags(2)
Not all the flags are supported. This still needs work.
- ZFSBoot
Support to boot off of ZFS pool. Not finished, AFAIK.
Submitted by: dfr
- Snapshot properties
- New failure modes
Before if write requested failed, system paniced. Now one can select from one of three failure modes: - panic - panic on write error - wait - wait for disk to reappear - continue - serve read requests if possible, block write requests
- Refquota, refreservation properties
Just quota and reservation properties, but don't count space consumed by children file systems, clones and snapshots.
- Sparse volumes
ZVOLs that don't reserve space in the pool.
- External attributes
Compatible with extattr(2).
- NFSv4-ACLs
Not sure about the status, might not be complete yet.
Submitted by: trasz
- Creation-time properties
- Regression tests for zpool(8) command.
Obtained from: OpenSolaris
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