[ I fat-fingered the linux-mm Cc:, so every reply will bounce on that, sorry about that :-/ Fixed it in this mail's Cc: list. ] * Ingo Molnar <mingo@xxxxxxxxxx> wrote: > Waiman Long reported 'pgd_lock' contention on high CPU count systems and > proposed moving pgd_lock on a separate cacheline to eliminate false sharing and > to reduce some of the lock bouncing overhead. So 'pgd_lock' is a global lock, used for every new task creation: arch/x86/mm/fault.c:DEFINE_SPINLOCK(pgd_lock); which with a sufficiently high CPU count starts to hurt. Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>