search for: _linux_lfsr_h

...lly get into long rehashing chains. --- include/linux/lfsr.h | 49 ++++++++++++ kernel/locking/qspinlock_paravirt.h | 143 ++++++++++++++++++++++++++++++++---- 2 files changed, 178 insertions(+), 14 deletions(-) --- /dev/null +++ b/include/linux/lfsr.h @@ -0,0 +1,49 @@ +#ifndef _LINUX_LFSR_H +#define _LINUX_LFSR_H + +/* + * Simple Binary Galois Linear Feedback Shift Register + * + * http://en.wikipedia.org/wiki/Linear_feedback_shift_register + * + */ + +extern void __lfsr_needs_more_taps(void); + +static __always_inline u32 lfsr_taps(int bits) +{ + if (bits == 1) return 0x0001; + if (...

...lly get into long rehashing chains. --- include/linux/lfsr.h | 49 ++++++++++++ kernel/locking/qspinlock_paravirt.h | 143 ++++++++++++++++++++++++++++++++---- 2 files changed, 178 insertions(+), 14 deletions(-) --- /dev/null +++ b/include/linux/lfsr.h @@ -0,0 +1,49 @@ +#ifndef _LINUX_LFSR_H +#define _LINUX_LFSR_H + +/* + * Simple Binary Galois Linear Feedback Shift Register + * + * http://en.wikipedia.org/wiki/Linear_feedback_shift_register + * + */ + +extern void __lfsr_needs_more_taps(void); + +static __always_inline u32 lfsr_taps(int bits) +{ + if (bits == 1) return 0x0001; + if (...

On 03/16/2015 09:16 AM, Peter Zijlstra wrote: > Implement simple paravirt support for the qspinlock. > > Provide a separate (second) version of the spin_lock_slowpath for > paravirt along with a special unlock path. > > The second slowpath is generated by adding a few pv hooks to the > normal slowpath, but where those will compile away for the native > case, they expand

On 03/16/2015 09:16 AM, Peter Zijlstra wrote: > Implement simple paravirt support for the qspinlock. > > Provide a separate (second) version of the spin_lock_slowpath for > paravirt along with a special unlock path. > > The second slowpath is generated by adding a few pv hooks to the > normal slowpath, but where those will compile away for the native > case, they expand

v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve upon the PV qspinlock code by dynamically allocating the hash table as well as some other performance optimization. - Simplified the Xen PV qspinlock code as suggested by David Vrabel <david.vrabel at citrix.com>. - Add benchmarking data for 3.19 kernel to compare the performance of a spinlock heavy test

v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve upon the PV qspinlock code by dynamically allocating the hash table as well as some other performance optimization. - Simplified the Xen PV qspinlock code as suggested by David Vrabel <david.vrabel at citrix.com>. - Add benchmarking data for 3.19 kernel to compare the performance of a spinlock heavy test