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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-BZ">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">We’re debugging an in-house application that makes use of hard limit extensively. We ran into a lot of timing windows (all our own making) and we use runq -g command a lot. The current runq -g display only the RBROOT
pointer. It really is a bit inconvenient to traverse the task_group hierarchy. It would be nice to have the command also display the corresponding task_group, cfs_rq pointer (at a minimum). Since the way we crash the system by messing up the nr_running and
h_nr_running, so we also display those two fields at the same time. Here’s an example of before and after.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">CPU 4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> CURRENT: PID: 0 TASK: ffff8840668c0380 COMMAND: "swapper"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> TASK_GROUP RT_RQ: ffff8800027d3820<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> RT PRIO_ARRAY: ffff8800027d3820<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> [no tasks queued]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> TASK_GROUP CFS_RQ: ffff8800027d36e0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> CFS RB_ROOT: ffff8800027d3710<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff883ff69bcc30 <TDAT><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff884006290e30 <User><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff88400641c430 <TDWMVP1><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff88400646b030 <ServDown1:0><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff884006492630 <ServOrder1:1><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff883ff058fe30 <TDWMWD57> (THROTTLED)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP CFS RB_ROOT: ffff88047889ee30 <S:WD:3d:35fa><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> [120] PID: 27655 TASK: ffff8805078ce2c0 COMMAND: "actmain"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> <<< more throttled groups removed >>><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">CPU 4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> CURRENT: PID: 0 CFS: ffff8800027d36e0 TASK: ffff8840668c0380 COMMAND: "swapper"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> TASK_GROUP RT_RQ: ffff8800027d3820<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> RT PRIO_ARRAY: ffff8800027d3820<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> [no tasks queued]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> TASK_GROUP CFS_RQ: ffff8800027d36e0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> CFS RB_ROOT: ffff8800027d3710<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff88405394d000 CFS: ffff883ff69bcc00 RB_ROOT: ffff883ff69bcc30 <TDAT> (0 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff88405906c400 CFS: ffff884006290e00 RB_ROOT: ffff884006290e30 <User> (0 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff884055081000 CFS: ffff88400641c400 RB_ROOT: ffff88400641c430 <TDWMVP1> (0 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff884055081c00 CFS: ffff88400646b000 RB_ROOT: ffff88400646b030 <ServDown1:0> (0 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff8840580fd400 CFS: ffff884006492600 RB_ROOT: ffff884006492630 <ServOrder1:1> (0 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff884058f58c00 CFS: ffff883ff058fe00 RB_ROOT: ffff883ff058fe30 <TDWMWD57> (7 9) (THROTTLED)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> GROUP: ffff8808fb976000 CFS: ffff88047889ee00 RB_ROOT: ffff88047889ee30 <S:WD:3d:35fa> (1 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> [120] PID: 27655 TASK: ffff8805078ce2c0 COMMAND: "actmain"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"> <<< more throttled groups removed >>><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">I have attached the patch we use to display additional information. Could you please take a look at my proposal to see if it is possible that you include this kind of display format.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ">Anthony<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-BZ" style="color:#1F497D"><o:p> </o:p></span></p>
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