Date: Wed, 01 Jan 2020 16:28:35 +0000 From: Robert Crowston <crowston@protonmail.com> To: FreeBSD virtualization <freebsd-virtualization@freebsd.org> Subject: RFC: in-guest CPU tick counters Message-ID: <6fKdhaZusPRl6_RJb__9Pb0G7qzUKz9Jm-1cX26HDLrz3DJexiSJ2i-qNV5-iseDRjy1K_PE7ABijXolae03iM223LA4MOsMQ74E2rVu2qA=@protonmail.com>
next in thread | raw e-mail | index | archive | help
I have written a patch that exposes to a sysctl the ticks spent by each CPU= executing guest code under bhyve. This new feature differs from the existing vmm_stats code in that the exist= ing code expresses per-vm information on a per-virtual-cpu basis. This new = patch provides a per-physical-cpu counter of the aggregate number of ticks = dedicated to executing guest-mode code since the vmm.ko module was loaded. = Following the example of kern.cp_times, it is expressed as a new sysctl ("h= w.vmm.stat.guest_ticks") rather than a system call, but I am not particular= ly attached to that. The diffs may be seen here: https://github.com/freebsd/freebsd/compare/master...RobCrowston:vmm-host-st= ats I am looking for comments. If the general idea meets with this list's appro= val, I will submit it to phabricator. The new data are intended to be used by utilities like htop. To that end, I= have written a separate patch for htop that colours the CPU bars to expres= s the time spent for guest execution. After re-compiling htop, enable it wi= th F2 ("Setup") -> "Display Options" -> "Detailed CPU time (System/IO-Wait/= Hard-IRQ/Soft-IRQ/Steal/Guest)". Presently, htop only supports this feature= for Linux hosts. If the above patch is accepted, I will submit the followi= ng patch to htop separately: https://github.com/hishamhm/htop/compare/master...RobCrowston:freebsd-vmm-c= ounter-1 Happy New Year, Rob Crowston.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?6fKdhaZusPRl6_RJb__9Pb0G7qzUKz9Jm-1cX26HDLrz3DJexiSJ2i-qNV5-iseDRjy1K_PE7ABijXolae03iM223LA4MOsMQ74E2rVu2qA=>