Hi, So, this is basically the same as v1, with three major differences: 1) I am posting to lkml for wider audience 2) patch 2/7 fixes one problem I mentined would happen in smp systems, which is, we only update kvmclock when we changes pcup 3) softlockup algorithm is changed. Again, as marcelo pointed out, this is open to discussion, and I am not dropping it so more people can step in. I have some other patches under local test for a slightly modified guest part accounting, and I do somehow support extending the interface, and changing to nsecs (maybe not 100 %, but...). But I am posting in this state so we can have lkml people to step in earlier. Reminder of the previous cover-letter: There are two parts of it: the guest and host part. The proposal for the guest part, is to just change the common time accounting, and try to identify at that spot, wether or not we should account any steal time. I considered this idea less cumbersome that trying to cook a clockevents implementation ourselves, since I see little value in it. I am, however, pretty open to suggestions. For the host<->guest communications, I am using a shared page, in the same way as pvclock. Because of that, I am just hijacking pvclock structure anyway. There is a 32-bit field floating by, that gives us enough room for 8 years of steal time (we use msec resolution). The main idea is to timestamp our exit and entry through sched notifiers, and export the value at pvclock updates. This obviously have some disadvantages: by doing this we are giving up futures ideas about only updating this structure once, and even right now, won't work on pinned-smp (since we don't update pvclock if we haven't changed cpus.) But again, it is just an RFC, and I'd like to feel the reception of the idea as a whole. Glauber Costa (7): change headers preparing for steal time always call kvm_write_guest measure time out of guest change kernel accounting to include steal time kvm steal time implementation touch softlockup watchdog tell guest about steal time feature arch/x86/include/asm/kvm_host.h | 2 + arch/x86/include/asm/kvm_para.h | 1 + arch/x86/include/asm/pvclock-abi.h | 4 ++- arch/x86/kernel/kvmclock.c | 40 ++++++++++++++++++++++++++++++++++++ arch/x86/kvm/x86.c | 26 ++++++++++++++++++---- include/linux/sched.h | 1 + kernel/sched.c | 29 ++++++++++++++++++++++++++ 7 files changed, 97 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
