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...41 +++++++++++++++++++++++++++++++++ arch/x86/include/asm/spinlock.h | 5 ++++ arch/x86/include/asm/spinlock_types.h | 4 +++ 4 files changed, 51 insertions(+), 0 deletions(-) create mode 100644 arch/x86/include/asm/qspinlock.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0af5250..de573f9 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -17,6 +17,7 @@ config X86_64 depends on 64BIT select X86_DEV_DMA_OPS select ARCH_USE_CMPXCHG_LOCKREF + select ARCH_USE_QUEUE_SPINLOCK ### Arch settings config X86 diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/incl...

...+++ > arch/x86/include/asm/spinlock.h | 5 ++++ > arch/x86/include/asm/spinlock_types.h | 4 +++ > 4 files changed, 51 insertions(+), 0 deletions(-) > create mode 100644 arch/x86/include/asm/qspinlock.h > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 0af5250..de573f9 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -17,6 +17,7 @@ config X86_64 > depends on 64BIT > select X86_DEV_DMA_OPS > select ARCH_USE_CMPXCHG_LOCKREF > + select ARCH_USE_QUEUE_SPINLOCK > > ### Arch settings > config X86 > diff -...

...+++ > arch/x86/include/asm/spinlock.h | 5 ++++ > arch/x86/include/asm/spinlock_types.h | 4 +++ > 4 files changed, 51 insertions(+), 0 deletions(-) > create mode 100644 arch/x86/include/asm/qspinlock.h > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 0af5250..de573f9 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -17,6 +17,7 @@ config X86_64 > depends on 64BIT > select X86_DEV_DMA_OPS > select ARCH_USE_CMPXCHG_LOCKREF > + select ARCH_USE_QUEUE_SPINLOCK > > ### Arch settings > config X86 > diff -...

...arch/x86/kernel/ptrace.c | 8 ++++ arch/x86/xen/enlighten.c | 4 ++ drivers/tty/vt/vt_ioctl.c | 2 +- kernel/sys_ni.c | 5 +++ 17 files changed, 170 insertions(+), 63 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0af5250..6ce28fb 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -970,6 +970,16 @@ config VM86 XFree86 to initialize some video cards via BIOS. Disabling this option saves about 6k. +config X86_IOPORT + bool "iopl and ioperm system calls" + default y + ---help--- + This option...

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit