Bochs meanger 2.4.7 update#
Bochs meanger 2.4.7 Patch#
Bochs meanger 2.4.7 portable#
Bochs meanger 2.4.7 pro#

Rwsem_down_read_slowpath(struct rw_semaphore *sem, int state, long count) +++ -991,16 +991,27 rwsem_spin_on_owner(struct rw_semaphore *sem, unsigned long nonspinnable) Long cnt = atomic_long_add_return_acquire(RWSEM_READER_BIAS, &sem->count) +static inline long rwsem_read_trylock(struct rw_semaphore *sem) static inline bool rwsem_read_trylock(struct rw_semaphore *sem) +++ -270,12 +270,12 static inline void rwsem_set_nonspinnable(struct rw_semaphore *sem) Kernel/locking/rwsem.c | 20 ++++++++++++-ġ file changed, 12 insertions(+), 8 deletions(-)ĭiff -git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c Passed down to rwsem_down_read_slowpath() to be used when appropriate. To determine the rwsem state at trylock time. The atomic count value right after reader count increment can be useful ` (4 subsequent siblings) 5 siblings, 1 reply 21+ messages in thread 4:14 ` locking/rwsem: Prevent potential lock starvation Waiman Long 4:14 locking/rwsem: Rework reader optimistic spinning Waiman 4:14 ` Waiman Long * locking/rwsem: Pass the current atomic count to rwsem_down_read_slowpath() Locking/rwsem: Remove reader optimistic spinning Locking/rwsem: Wake up all waiting readers if RWSEM_WAKE_READ_OWNED Locking/rwsem: Enable reader optimistic lock stealing Locking/rwsem: Prevent potential lock starvation Locking/rwsem: Pass the current atomic count to To spin on a reader-owned rwsem for a limited time.

Bochs meanger 2.4.7 Patch#

This patch series adopts the second approach by dropping reader spinningįor now as it simplifies the code. Two differentġ) further reduce reader optimistic spinning

Reduce performance in some heavily contented cases. Then there is the issue of reader fragmentation that can potentially Patchesģ and 4 are further optimizations of the current code. That patchĭoes reduce reader spinning to avoid this potential problem. Potential lock starvation scenario as explained in patch 2.

Bochs meanger 2.4.7 pro#

Time due to rwsem reader optimistic spinning led me to reexamine theĬode to see the pro and cons of doing it. Patch 5: fix !CONFIG_RWSEM_SPIN_ON_OWNER compilation errors.Ī recent report of SAP certification failure caused by increased system Patch 4: correctly handle HANDOFF clearing. Patch 3: rename osq_is_empty() to rwsem_no_spinners() as suggested.

Bochs meanger 2.4.7 update#

Update some commit logs to incorporate review comments. To: Peter Zijlstra, Ingo Molnar, Will DeaconĬc: linux-kernel, Davidlohr Bueso, Phil Auld, Waiman Long ` (5 more replies) 0 siblings, 6 replies 21+ messages in thread 4:14 ` locking/rwsem: Pass the current atomic count to rwsem_down_read_slowpath() Waiman Long

Bochs meanger 2.4.7 portable#

Bochs will allow you to run Win 95 and associated software on your Unix/X11 workstation, displaying a window on your workstation, simulating a monitor on a PC.ĭownload Bochs Portable 2.4.Locking/rwsem: Rework reader optimistic spinning All of help / color / mirror / Atom feed * locking/rwsem: Rework reader optimistic spinning 4:14 Waiman Long For instance, let's say your workstation is a Unix/X11 workstation, but you want to run Win'95 applications. This allows you to run OS's and software within the emulator on your workstation, much like you have a machine inside of a machine. The 'typical' use of bochs is to provide complete x86 PC emulation, including the x86 processor, hardware devices, and memory. Bochs was written by Kevin Lawton and is currently maintained by this project.īochs can be compiled and used in a variety of modes, some which are still in development. Currently, Bochs can be compiled to emulate a 386, 486, Pentium/PentiumII/PentiumIII/Pentium4 or x86-64 CPU including optional MMX, SSEx and 3DNow! instructions.īochs is capable of running most Operating Systems inside the emulation including Linux, DOS, Windows® 95/98 and Windows® NT/2000/XP or Windows Vista. It includes emulation of the Intel x86 CPU, common I/O devices, and a custom BIOS. Description: Bochs is a highly portable open source IA-32 (x86) PC emulator written in C++, that runs on most popular platforms.