The first two of these patches were posted last February, the last one is new. Rik's old measurements were that it shaved around .3 microseconds on each iteration of his KVM benchmark.
I guess three days before the start of the merge window is not the best time to post patches. However, I brought this series up at kernel summit yesterday, and Andy's cleanups actually makes it trivial to apply this to syscall entry. So here it is, perhaps it's worth it. Assuming it works, of course, because this is compile-tested only. :) Paolo Paolo Bonzini (3): context_tracking: remove duplicate enabled check context_tracking: avoid irq_save/irq_restore on guest entry and exit x86: context_tracking: avoid irq_save/irq_restore on kernel entry and exit arch/x86/entry/common.c | 4 +- include/linux/context_tracking.h | 50 +++++++++++++++++-------- kernel/context_tracking.c | 80 ++++++++++++++++++++-------------------- 3 files changed, 76 insertions(+), 58 deletions(-) -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
