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* sys/sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326256
* - Restore runq to manipulating threads directly by putting runq links andJeff Roberson2008-03-201-9/+9
| | | | | | | | | | | | | | rqindex back in struct thread. - Compile kern_switch.c independently again and stop #include'ing it from schedulers. - Remove the ts_thread backpointers and convert most code to go from struct thread to struct td_sched. - Cleanup the ts_flags #define garbage that was causing us to sometimes do things that expanded to td->td_sched->ts_thread->td_flags in 4BSD. - Export the kern.sched sysctl node in sysctl.h Notes: svn path=/head/; revision=177435
* - Move maybe_preempt() from kern_switch.c to sched_4bsd.c. This is functionJeff Roberson2008-03-201-0/+1
| | | | | | | | | | | is only used by 4bsd. - Create a new runq_choose_fuzz() function rather than polluting runq_choose() with 4BSD specific code. - Move the fuzz sysctl into sched_4bsd.c - Remove some dead code from kern_switch.c Notes: svn path=/head/; revision=177419
* - Change types for necent runq additions to u_char rather than int.Jeff Roberson2007-02-081-3/+3
| | | | | | | | | | - Fix these types in ULE as well. This fixes bugs in priority index calculations in certain edge cases. (int)-1 % 64 != (uint)-1 % 64. Reported by: kkenn using pho's stress2. Notes: svn path=/head/; revision=166557
* - Don't pass a pointer into runq_choose_from(). The caller can adjust theJeff Roberson2007-01-041-1/+1
| | | | | | | index if it chooses to. Notes: svn path=/head/; revision=165765
* - Add three new functions to support circular run queues.Jeff Roberson2007-01-041-1/+4
| | | | | | | | | | | | | - runq_add_pri allows the caller to position the thread at any rqindex regardless of priority. - runq_choose_from() chooses the lowest priority thread starting from a given index. The index is updated with the rqindex of the chosen thread. This routine is used to pick the lowest priority relative to a given index. - runq_remove_idx() updates the index if the run queue that held the removed thread is now empty. Notes: svn path=/head/; revision=165761
* Threading cleanup.. part 2 of several.Julian Elischer2006-12-061-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | Make part of John Birrell's KSE patch permanent.. Specifically, remove: Any reference of the ksegrp structure. This feature was never fully utilised and made things overly complicated. All code in the scheduler that tried to make threaded programs fair to unthreaded programs. Libpthread processes will already do this to some extent and libthr processes already disable it. Also: Since this makes such a big change to the scheduler(s), take the opportunity to rename some structures and elements that had to be moved anyhow. This makes the code a lot more readable. The ULE scheduler compiles again but I have no idea if it works. The 4bsd scheduler still reqires a little cleaning and some functions that now do ALMOST nothing will go away, but I thought I'd do that as a separate commit. Tested by David Xu, and Dan Eischen using libthr and libpthread. Notes: svn path=/head/; revision=164936
* /* -> /*- for license, minor formatting changesWarner Losh2005-01-071-1/+1
| | | | Notes: svn path=/head/; revision=139825
* When preempting a thread, put it back on the HEAD of its run queue.Julian Elischer2004-10-051-1/+1
| | | | | | | | | (Only really implemented in 4bsd) MFC after: 4 days Notes: svn path=/head/; revision=136170
* Make the run queue parameters machine dependent. Optimize 64 bitJake Burkholder2002-05-251-13/+2
| | | | | | | | | | architectures by using a 64 bit word for the bit array which keeps track of non-empty queues. Reviewed by: peter Notes: svn path=/head/; revision=97261
* KSE Milestone 2Julian Elischer2001-09-121-4/+6
| | | | | | | | | | | | | | | | | Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha Notes: svn path=/head/; revision=83366
* style(9) the structure definitions.David E. O'Brien2001-09-051-2/+2
| | | | Notes: svn path=/head/; revision=83045
* Implement a unified run queue and adjust priority levels accordingly.Jake Burkholder2001-02-121-0/+80
- All processes go into the same array of queues, with different scheduling classes using different portions of the array. This allows user processes to have their priorities propogated up into interrupt thread range if need be. - I chose 64 run queues as an arbitrary number that is greater than 32. We used to have 4 separate arrays of 32 queues each, so this may not be optimal. The new run queue code was written with this in mind; changing the number of run queues only requires changing constants in runq.h and adjusting the priority levels. - The new run queue code takes the run queue as a parameter. This is intended to be used to create per-cpu run queues. Implement wrappers for compatibility with the old interface which pass in the global run queue structure. - Group the priority level, user priority, native priority (before propogation) and the scheduling class into a struct priority. - Change any hard coded priority levels that I found to use symbolic constants (TTIPRI and TTOPRI). - Remove the curpriority global variable and use that of curproc. This was used to detect when a process' priority had lowered and it should yield. We now effectively yield on every interrupt. - Activate propogate_priority(). It should now have the desired effect without needing to also propogate the scheduling class. - Temporarily comment out the call to vm_page_zero_idle() in the idle loop. It interfered with propogate_priority() because the idle process needed to do a non-blocking acquire of Giant and then other processes would try to propogate their priority onto it. The idle process should not do anything except idle. vm_page_zero_idle() will return in the form of an idle priority kernel thread which is woken up at apprioriate times by the vm system. - Update struct kinfo_proc to the new priority interface. Deliberately change its size by adjusting the spare fields. It remained the same size, but the layout has changed, so userland processes that use it would parse the data incorrectly. The size constraint should really be changed to an arbitrary version number. Also add a debug.sizeof sysctl node for struct kinfo_proc. Notes: svn path=/head/; revision=72376