Le vendredi 04 juin 2010 à 16:43 +1000, Nick Piggin a écrit :
> pièce jointe document texte brut (kernel-introduce-brlock.patch)
> This patch introduces "local-global" locks (lglocks). These can be used to:
>
> - Provide fast exclusive access to per-CPU data, with exclusive access to
> another CPU's data allowed but possibly subject to contention, and to provide
> very slow exclusive access to all per-CPU data.
> - Or to provide very fast and scalable read serialisation, and to provide
> very slow exclusive serialisation of data (not necessarily per-CPU data).
>
> Brlocks are also implemented as a short-hand notation for the latter use
> case.
>
> Thanks to Paul for local/global naming convention.
>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-fsdevel@xxxxxxxxxxxxxxx
> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
> Cc: Frank Mayhar <fmayhar@xxxxxxxxxx>,
> Cc: John Stultz <johnstul@xxxxxxxxxx>
> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
> ---
> include/linux/lglock.h | 165 +++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 165 insertions(+)
>
IMHO some changes in Documentation/ would be needed
> \
> + void name##_global_lock(void) { \
> + int i; \
> + preempt_disable(); \
> + rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_); \
> + for_each_online_cpu(i) { \
for_each_possible_cpu()
> + arch_spinlock_t *lock; \
> + lock = &per_cpu(name##_lock, i); \
> + arch_spin_lock(lock); \
> + } \
> + } \
> + EXPORT_SYMBOL(name##_global_lock); \
> + \
> + void name##_global_unlock(void) { \
> + int i; \
> + rwlock_release(&name##_lock_dep_map, 1, _RET_IP_); \
> + for_each_online_cpu(i) { \
for_each_possible_cpu()
> + arch_spinlock_t *lock; \
> + lock = &per_cpu(name##_lock, i); \
> + arch_spin_unlock(lock); \
> + } \
> + preempt_enable(); \
> + } \
> + EXPORT_SYMBOL(name##_global_unlock); \
> + \
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