[Crash-utility] [PATCH] runq: search current task's runqueue explicitly

Currently, runq sub-command doesn't consider CFS runqueue's current task removed from CFS runqueue. Due to this, the remaining CFS runqueus that follow the current task's is not displayed. This patch fixes this by making runq sub-command search current task's runqueue explicitly. Note that CFS runqueue exists for each task group, and so does CFS runqueue's current task, and the above search needs to be done recursively. Test ==== On vmcore I made 7 task groups: root group --- A --- AA --- AAA + +- AAB | +- AB --- ABA +- ABB and then I ran three CPU bound tasks, which is exactly the same as int main(void) { for (;;) continue; return 0; } for each task group, including root group; so total 24 tasks. For readability, I annotated each task name with its belonging group name. For example, loop.ABA belongs to task group ABA. Look at CPU0 collumn below. [before] lacks 8 tasks and [after] successfully shows all tasks on the runqueue, which is identical to the result of [sched debug] that is expected to ouput correct result. I'll send this vmcore later. [before] crash> runq | cat CPU 0 RUNQUEUE: ffff88000a215f80 CURRENT: PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA" RT PRIO_ARRAY: ffff88000a216098 [no tasks queued] CFS RB_ROOT: ffff88000a216010 [120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA" <cut> [after] crash_fix> runq CPU 0 RUNQUEUE: ffff88000a215f80 CURRENT: PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA" RT PRIO_ARRAY: ffff88000a216098 [no tasks queued] CFS RB_ROOT: ffff88000a216010 [120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA" [120] PID: 28271 TASK: ffff8800787a8b40 COMMAND: "loop.ABB" [120] PID: 28272 TASK: ffff880037afd580 COMMAND: "loop.ABB" [120] PID: 28245 TASK: ffff8800785e8b00 COMMAND: "loop.AB" [120] PID: 28246 TASK: ffff880078628ac0 COMMAND: "loop.AB" [120] PID: 28241 TASK: ffff880078616b40 COMMAND: "loop.AA" [120] PID: 28239 TASK: ffff8800785774c0 COMMAND: "loop.AA" [120] PID: 28240 TASK: ffff880078617580 COMMAND: "loop.AA" [120] PID: 28232 TASK: ffff880079b5d4c0 COMMAND: "loop.A" <cut> [sched debug] crash> runq -d CPU 0 [120] PID: 28232 TASK: ffff880079b5d4c0 COMMAND: "loop.A" [120] PID: 28239 TASK: ffff8800785774c0 COMMAND: "loop.AA" [120] PID: 28240 TASK: ffff880078617580 COMMAND: "loop.AA" [120] PID: 28241 TASK: ffff880078616b40 COMMAND: "loop.AA" [120] PID: 28245 TASK: ffff8800785e8b00 COMMAND: "loop.AB" [120] PID: 28246 TASK: ffff880078628ac0 COMMAND: "loop.AB" [120] PID: 28262 TASK: ffff880037cc40c0 COMMAND: "loop.ABA" [120] PID: 28263 TASK: ffff880037aaa040 COMMAND: "loop.ABA" [120] PID: 28271 TASK: ffff8800787a8b40 COMMAND: "loop.ABB" [120] PID: 28272 TASK: ffff880037afd580 COMMAND: "loop.ABB" <cut> Diff stat ========= defs.h | 1 + task.c | 37 +++++++++++++++++-------------------- 2 files changed, 18 insertions(+), 20 deletions(-) Thanks. HATAYAMA, Daisuke