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  15. Oct 06, 2020
    • Satya Durga Srinivasu Prabhala's avatar
      sched/walt: fix suspicious RCU usage warning · 461a275d
      Satya Durga Srinivasu Prabhala authored 
      
Below warning is observed during boot when lockdep is enabled:

[    0.122198] =============================
[    0.126373] WARNING: suspicious RCU usage
[    0.130545] 5.4.57-qgki-debug-g003be53-dirty #2 Not tainted
[    0.136352] -----------------------------
[    0.140526] include/linux/cgroup.h:488 suspicious rcu_dereference_check() usage!
[    0.148159]
[    0.148159] other info that might help us debug this:
[    0.148159]
[    0.156454]
[    0.156454] rcu_scheduler_active = 1, debug_locks = 1
[    0.163210] no locks held by swapper/0/0.
[    0.167381]
[    0.167381] stack backtrace:
[    0.171942] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.57-qgki-debug-g003be53-dirty #2
[    0.180347] Hardware name: Qualcomm Technologies, Inc. LahainaP MTP (DT)
[    0.187233] Call trace:
[    0.189770]  dump_backtrace.cfi_jt+0x0/0x4
[    0.193994]  show_stack+0x18/0x24
[    0.197420]  dump_stack+0xe0/0x160
[    0.200930]  lockdep_rcu_suspicious+0x138/0x154
[    0.205591]  add_new_task_to_grp+0x8c/0x1ac
[    0.209893]  wake_up_new_task+0x38/0x1f4
[    0.213942]  _do_fork+0x264/0x37c
[    0.217362]  kernel_thread+0x50/0x78
[    0.221054]  rest_init+0x2c/0x1f0
[    0.224479]  start_kernel+0x0/0x424
[    0.228070]  start_kernel+0x3ac/0x424

Fix it by adding RCU lock while dereferencing css for the task.

Change-Id: I3ef72f7e8abc2d40b7d954d8c1a486aead785333
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
      461a275d
  17. Sep 23, 2020
  19. Sep 21, 2020
    • Pavankumar Kondeti's avatar
      sched/walt: Fix a potential accounting issue during window size change · fce69881
      Pavankumar Kondeti authored 
      
There is a potential accounting issue during window size change, if
the roll over is delayed such that the current task's mark start went
past the new window start with the updated window size.

For example, system is running with window size = 20 msec. So it would be
like

20 | 40 | 60 | 80 | 100 | 120

At t= 98, the window size is changed to 8 msec. We expect this to be
handled at the next window roll over i.e t = 100

For some reason 98 < t < 109, interrupts are blocked on a CPU on which
roll over is supposed to happen.

Now at t = 109, the window roll over happen in the IRQ work. First
we roll over the window such that

wallclock (wc) = 109,
mark_start (ms) = 109,
window_start (ws) = 100.

New window size is set to 8 msec. At this point, we did not realize that
the ms/wc is went past the next window i.e 100 + 8 = 108 msec.

At t = 110, a task wakes up. We first call update_task_ravg() on the
current, for which ms = 109. We detect the window roll over but fail
to roll over the CPU busy time counters (prs/crs) since ms > ws.
see update_cpu_busy_time() for new_window detection. Now the utra()
is called for the waking task and its ms < ws and we roll over window for
it. if it migrates to another CPU, we try to subtract this task prs from
the CPU's prs which is not updated. This results in accounting issues.

This problem can be fixed easily by detecting the delayed window roll over
and deferring the window size update to next window roll over. Since this
is a very rare event, we don't miss anything. Also this is more optimized
compared to any changes in update_task_ravg() which is called many times
compared to a window roll over with a window size update pending.

Change-Id: Ia6e1750e632bf7594f0f83656986ad4393bfbe5a
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
      fce69881
  21. Sep 15, 2020
    • Shaleen Agrawal's avatar
      sched/walt: introduce trace_sched_ravg_window_change · 649fdbe0
      Shaleen Agrawal authored 
      
Currently we use a printk_deferred to notify when the window size
changes. However, this adds a complication while debugging because it
requires looking at the dmesg output. Instead, we introduce a trace
hook, as this can be easily enabled for collections, and can help
further improve scheduler debugging tools.

Change-Id: I6809589748eef606403940567bd8c66a774b93ea
Signed-off-by: default avatarShaleen Agrawal <shalagra@codeaurora.org>
      649fdbe0
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