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On Thu, 2007-09-20 at 06:55 +0200, Mike Galbraith wrote:But, I did just manage to trigger some horrid behavior, and log it. I modified the kernel to print task's actual tree key instead of their current vruntime, and was watching that while make -j2 was running (and not seeing anything very interesting), when on a lark, I restarted SuSE's system updater thingy. That beast chews 100% CPU for so long at startup that I long ago got annoyed, and changed it to run at nice 19. Anyway, when it started, interactivity went to hell in the proverbial hand-basket, and the sched_debug log shows some interesting results.. like spread0 hitting -13659412644, and cc1 being keyed at -3867063305. cpu#0, 2992.608 MHz .nr_running : 4 .load : 4096 .nr_switches : 1105882 .nr_load_updates : 735146 .nr_uninterruptible : 4294966399 .jiffies : 1936201 .next_balance : 1936276 .curr->pid : 27004 .clock : 735034802877 .idle_clock : 0 .prev_clock_raw : 2259213083886 .clock_warps : 0 .clock_overflows : 677631 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 4096 .cpu_load[1] : 3960 .cpu_load[2] : 3814 .cpu_load[3] : 3539 .cpu_load[4] : 3153 cfs_rq .exec_clock : 623175870707 .MIN_vruntime : 3791173262297 .min_vruntime : 3791173259723 .max_vruntime : 3791173264579 .spread : 2282 .spread0 : 0 .nr_sync_min_vruntime : 296756 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- bash 6338 3212 554 120 3791173262935 104271360 645224098563 R cc1 27004 -7509103 6 120 3791165750620 15396029 13300466 make 27006 4856 6 120 3791173264579 9540879 6458208 make 27010 2574 3 120 3791173262297 8897680 0 cpu#1, 2992.608 MHz .nr_running : 5 .load : 6208 .nr_switches : 1012995 .nr_load_updates : 747540 .nr_uninterruptible : 897 .jiffies : 1936201 .next_balance : 1936303 .curr->pid : 27012 .clock : 747426624818 .idle_clock : 0 .prev_clock_raw : 2259213140042 .clock_warps : 0 .clock_overflows : 582091 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 6208 .cpu_load[1] : 4545 .cpu_load[2] : 3810 .cpu_load[3] : 3065 .cpu_load[4] : 2397 cfs_rq .exec_clock : 581940255731 .MIN_vruntime : 3791835890838 .min_vruntime : 3791854778322 .max_vruntime : 3791902652145 .spread : 66761307 .spread0 : 681518599 .nr_sync_min_vruntime : 256743 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Xorg 5740 -18887484 157025 115 3791835890838 46597617 638567698716 update-status 26093 48184396 1537 139 3791902652145 5709334592 2622161813 sh 27011 -6808461 2 120 3791847969861 4162855 1457101 R cat 27012 -19965525 3 120 3791836175385 1756456 1974618 bash 27013 1498 2 120 3791854779820 394907 0 Sched Debug Version: v0.05-v20, 2.6.23-rc6-smp-d #43 now at 2237384024289 nsecs cpu#0, 2992.608 MHz .nr_running : 2 .load : 1039 .nr_switches : 1106019 .nr_load_updates : 736329 .nr_uninterruptible : 4294966399 .jiffies : 1937383 .next_balance : 1937428 .curr->pid : 27087 .clock : 736217427466 .idle_clock : 0 .prev_clock_raw : 2260395464994 .clock_warps : 0 .clock_overflows : 678147 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 1039 .cpu_load[1] : 1039 .cpu_load[2] : 1039 .cpu_load[3] : 1039 .cpu_load[4] : 1039 cfs_rq .exec_clock : 624358414291 .MIN_vruntime : 3806531640151 .min_vruntime : 3806501788119 .max_vruntime : 3806531640151 .spread : 0 .spread0 : 0 .nr_sync_min_vruntime : 296782 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- update-status 26093 56810274 1572 139 3806531640151 5929003154 2622161813 R cc1 27087 0 13 120 3806501788119 403581890 15024992 cpu#1, 2992.608 MHz .nr_running : 2 .load : 2048 .nr_switches : 1013933 .nr_load_updates : 748722 .nr_uninterruptible : 898 .jiffies : 1937383 .next_balance : 1937455 .curr->pid : 27089 .clock : 748608445154 .idle_clock : 0 .prev_clock_raw : 2260394709751 .clock_warps : 0 .clock_overflows : 582583 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 2048 .cpu_load[1] : 5016 .cpu_load[2] : 6366 .cpu_load[3] : 7081 .cpu_load[4] : 6895 cfs_rq .exec_clock : 583122024084 .MIN_vruntime : 3806331397540 .min_vruntime : 3806350696772 .max_vruntime : 3806331397540 .spread : 0 .spread0 : -151091347 .nr_sync_min_vruntime : 256756 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- konsole 6330 -19299232 124476 120 3806331397540 17086991675 615801753460 R cat 27089 -19513636 2 120 3806331713718 1163204 7839421 Sched Debug Version: v0.05-v20, 2.6.23-rc6-smp-d #43 now at 2238396055118 nsecs cpu#0, 2992.608 MHz .nr_running : 4 .load : 3087 .nr_switches : 1106671 .nr_load_updates : 737341 .nr_uninterruptible : 4294966395 .jiffies : 1938395 .next_balance : 1938412 .curr->pid : 27115 .clock : 737229273643 .idle_clock : 0 .prev_clock_raw : 2261407091960 .clock_warps : 0 .clock_overflows : 678565 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 3087 .cpu_load[1] : 3055 .cpu_load[2] : 2723 .cpu_load[3] : 2169 .cpu_load[4] : 1698 cfs_rq .exec_clock : 625370185925 .MIN_vruntime : 3833041200497 .min_vruntime : 3833041199517 .max_vruntime : 3833103226422 .spread : 62025925 .spread0 : 0 .nr_sync_min_vruntime : 296798 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- bash 6334 980 4556 120 3833041200497 565634278 646894253582 update-status 26093 66364651 1667 139 3833103226422 6318237803 2622161813 cc1 27112 1387807 22 120 3833042327482 242204855 12705113 R cat 27115 -19905217 2 120 3833023008660 1844735 3670718 cpu#1, 2992.608 MHz .nr_running : 2 .load : 4145 .nr_switches : 1014099 .nr_load_updates : 749734 .nr_uninterruptible : 901 .jiffies : 1938395 .next_balance : 1938479 .curr->pid : 27084 .clock : 749620291330 .idle_clock : 0 .prev_clock_raw : 2261406342542 .clock_warps : 0 .clock_overflows : 582991 .clock_deep_idle_events : 0 .clock_max_delta : 999848 .cpu_load[0] : 4145 .cpu_load[1] : 4145 .cpu_load[2] : 4136 .cpu_load[3] : 3934 .cpu_load[4] : 3342 cfs_rq .exec_clock : 584133842523 .MIN_vruntime : 3819361786873 .min_vruntime : 3819381786873 .max_vruntime : 3819361786873 .spread : 0 .spread0 : -13659412644 .nr_sync_min_vruntime : 256768 runnable tasks: task PID tree-key switches prio exec-runtime sum-exec sum-sleep ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- kacpid 73 -20000000 1073 115 3819361786873 489384092 743825068255 R cc1 27084 -3867063305 138 120 3815518715812 1205052524 24535558 -
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