(Updated) Preemptible Kernel
PATCH 1/1 (Updated) Preemptible Kernel
Updated patches for 2.4.10, 2.4.11-pre1, and 2.4.10-ac1 are at
http://tech9.net/rml/linux
Note that the 2.4.10 patch is updated over previous patches.
It's been awhile, because a lot has changed. Please give this a good once (and twice) -over. For those of you using preempt-stats, I suggest not keeping that patch compiled in during regular use and certainly not during any benchmarking.
What's New:
Most notably, George Anzinger of MontaVista rewrote how we keep track of whether a task is preempted or not. The "preempt bit" has been moved from a task's status flag to the preempt_count (per-task_struct) variable. The resulting code is cleaner and simpler, and as a bonus the race with ptrace and signals (and any undetected similar problems) has been fixed, so we don't need explicit fixes.
I also renamed our namespace, cleaning things up, and trying to stick to a prefix of "preempt." Most important, ctx_sw_on and ctx_sw_off are now preempt_enable and preempt_disable.
The ChangeLog since the last official release:
20010928
- have spin_lock_prefetch prefetch the preempt_count, too, since its incremented on each spin_lock
- some more ifdef and namespace cleanups
20010925
- modify our handling of the "preemption bit": move from the task's status to the preempt_count
- the above removes the risk of race in ptrace and SIGSTOP signal handling, so we can back out those fixes.
- rearrange our namespace. most notably, ctx_sw_on/off is now preempt_enable/disable.
- cleanup some defines
20010923
- fix strace race: make ptrace preempt safe
- fix job control race: make SIGSTOP signal preempt safe
- fix adfs compile bug: add sched.h include to fs/adfs/map.c
Signature · 3 lines
Robert M. Love rml at ufl.edu rml at tech9.net
--- Robert Love <[email protected]> wrote: > Updated
patches for 2.4.10, 2.4.11-pre1, and
Quoted 2 lines
2.4.10-ac1 are at
http://tech9.net/rml/linux
Sorry it seems that your patches has not uploaded yet :-)
Cheers,
=====
S.KIEU
http://travel.yahoo.com.au - Yahoo! Travel
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Quoted 2 lines · Steve Kieu
Sorry it seems that your patches has not uploaded yet :-)
Hm, check again -- I see them. I've already gotten emails about them, so I guess others do, too :)
Quoted 1 line
From http://tech9.net/rml/linux, the patches are at:
http://tech9.net/rml/linux/patch-rml-2.4.10-ac1-preempt-kernel-1
http://tech9.net/rml/linux/patch-rml-2.4.11-pre1-preempt-kernel-1
http://tech9.net/rml/linux/patch-rml-2.4.10-preempt-kernel-5
Signature · 3 lines
Robert M. Love rml at ufl.edu rml at tech9.net