git: kernel - Revamp LWKT thread migration
commit cc9b6223b2987bd6f07ca869665f420285917156
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Thu Mar 24 14:40:08 2011 -0700
kernel - Revamp LWKT thread migration
* Rearrange the handling of TDF_RUNNING, making lwkt_switch() responsible
for it instead of the assembly switch code. Adjust td->td_switch() to
return the previously running thread.
This allows lwkt_switch() to process thread migration between cpus after
the thread has been completely and utterly switched out, removing the
need to loop on TDF_RUNNING on the target cpu.
* Fixes lwkt_setcpu_remote livelock failure
* This required major surgery on the core thread switch assembly, testing
is needed. I tried to avoid doing this but the livelock problems persisted,
so the only solution was to remove the need for the loops that were causing
the livelocks.
* NOTE: The user process scheduler is still using the old giveaway/acquire
method. More work is needed here.
Reported-by: "Magliano Andre'" <masterblaster@tiscali.it>
Summary of changes:
sys/kern/lwkt_thread.c | 135 +++++++++++++++++++--------
sys/kern/usched_bsd4.c | 4 +
sys/platform/pc32/i386/exception.s | 12 +++
sys/platform/pc32/i386/swtch.s | 75 ++++++++++------
sys/platform/pc32/include/md_var.h | 7 ++-
sys/platform/pc64/include/md_var.h | 2 +-
sys/platform/pc64/x86_64/exception.S | 11 +++
sys/platform/pc64/x86_64/swtch.s | 78 ++++++++++------
sys/platform/vkernel/i386/fork_tramp.s | 12 +++
sys/platform/vkernel/i386/swtch.s | 76 ++++++++++------
sys/platform/vkernel/include/md_var.h | 2 +-
sys/platform/vkernel64/include/md_var.h | 2 +-
sys/platform/vkernel64/x86_64/fork_tramp.s | 11 +++
sys/platform/vkernel64/x86_64/swtch.s | 85 +++++++++++-------
sys/sys/proc.h | 4 +-
sys/sys/thread.h | 4 +-
16 files changed, 352 insertions(+), 168 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/cc9b6223b2987bd6f07ca869665f420285917156
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