[GIT PULL] sched/urgent for v6.13-rc3

[GIT PULL] sched/urgent for v6.13-rc3

[Borislav Petkov]

Hi Linus,

please pull the sched/urgent lineup for v6.13-rc3.

Thx.

---

The following changes since commit 40384c840ea1944d7c5a392e8975ed088ecf0b37:

  Linux 6.13-rc1 (2024-12-01 14:28:56 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip tags/sched_urgent_for_v6.13_rc3

for you to fetch changes up to 82f9cc094975240885c93effbca7f4603f5de1bf:

  locking: rtmutex: Fix wake_q logic in task_blocks_on_rt_mutex (2024-12-02 12:01:29 +0100)

----------------------------------------------------------------
- Remove wrong enqueueing of a task for a later wakeup when a task blocks on
  a RT mutex

- Do not setup a new deadline entity on a boosted task as that has happened
  already

- Update preempt= kernel command line param

- Prevent needless softirqd wakeups in the idle task's context

- Detect the case where the idle load balancer CPU becomes busy and avoid
  unnecessary load balancing invocation

- Remove an unnecessary load balancing need_resched() call in nohz_csd_func()

- Allow for raising of SCHED_SOFTIRQ softirq type on RT but retain the warning
  to catch any other cases

- Remove a wrong warning when a cpuset update makes the task affinity no
  longer a subset of the cpuset

----------------------------------------------------------------
John Stultz (1):
      locking: rtmutex: Fix wake_q logic in task_blocks_on_rt_mutex

Josh Don (1):
      sched: fix warning in sched_setaffinity

Juri Lelli (1):
      sched/deadline: Fix replenish_dl_new_period dl_server condition

K Prateek Nayak (4):
      softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel
      sched/core: Remove the unnecessary need_resched() check in nohz_csd_func()
      sched/fair: Check idle_cpu() before need_resched() to detect ilb CPU turning busy
      sched/core: Prevent wakeup of ksoftirqd during idle load balance

Sebastian Andrzej Siewior (1):
      sched/core: Update kernel boot parameters for LAZY preempt.

Wander Lairson Costa (1):
      sched/deadline: Fix warning in migrate_enable for boosted tasks

 Documentation/admin-guide/kernel-parameters.txt |  5 +++++
 kernel/locking/rtmutex.c                        |  3 ---
 kernel/sched/core.c                             |  4 ++--
 kernel/sched/deadline.c                         |  3 ++-
 kernel/sched/fair.c                             |  2 +-
 kernel/sched/syscalls.c                         |  2 +-
 kernel/softirq.c                                | 15 +++++++++++----
 7 files changed, 22 insertions(+), 12 deletions(-)


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [GIT PULL] sched/urgent for v6.13-rc3

[pr-tracker-bot]

The pull request you sent on Mon, 9 Dec 2024 10:48:22 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip tags/sched_urgent_for_v6.13_rc3

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/df9e2102de839c587eb50b2a5d1d19b07a6caaf5

Thank you!

-- 
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Re: [GIT PULL] sched/urgent for v6.13-rc3

[Sasha Levin]

On Mon, Dec 09, 2024 at 10:48:22AM +0100, Borislav Petkov wrote:
>Hi Linus,
>
>please pull the sched/urgent lineup for v6.13-rc3.

Hey Boris,

I'm a bit late to this party, but I've started seeing the following
warning. I'm not 100% sure that this PR is the culprit because Linus
ended up pulling it before I could run tests on it, but I haven't seen
this warning before.

[ 1107.003243] ------------[ cut here ]------------
[ 1107.010677] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x4a8/0x570
[ 1107.021252] Modules linked in: crct10dif_ce sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 fuse drm backlight ip_tables x_tables [last unloaded: ftrace_direct]
[ 1107.056578] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.13.0-rc2 #1
[ 1107.064302] Hardware name: linux,dummy-virt (DT)
[ 1107.071887] pstate: a24020c9 (NzCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
[ 1107.080224] pc : enqueue_dl_entity+0x4a8/0x570
[ 1107.086456] lr : return_to_handler+0x0/0x48
[ 1107.093564] sp : ffff8000800d3a40
[ 1107.098945] x29: ffff8000800d3a40 x28: fff00000ff6e8d80 x27: 0000000000000000
[ 1107.112664] x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000048
[ 1107.125440] x23: fff00000ff6c6d80 x22: 0000000000000001 x21: 000000000016e360
[ 1107.137742] x20: 0000000000000001 x19: fff00000ff6c76e8 x18: 0000000000000000
[ 1107.150485] x17: 0000000000000000 x16: ffff800080008000 x15: 0000000000000000
[ 1107.163991] x14: fff00000ff6e8e00 x13: 0000000000000001 x12: 0000000000002229
[ 1107.174756] x11: ffffb0af24c4a670 x10: ffff8000800d3a70 x9 : ffffb0af227176d0
[ 1107.187747] x8 : ffff8000800d38d8 x7 : 0000000002d37310 x6 : fff00000c6d27500
[ 1107.200948] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
[ 1107.215525] x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
[ 1107.228386] Call trace:
[ 1107.233927]  enqueue_dl_entity+0x4a8/0x570 (P)
[ 1107.240669]  dl_server_start+0x4c/0x138 (F)
[ 1107.246980]  enqueue_task_fair+0x128/0x4b0 (F)
[ 1107.253826]  enqueue_task+0x44/0x80 (F)
[ 1107.259958]  activate_task+0x70/0x90 (F)
[ 1107.265928]  attach_task+0x54/0x88 (F)
[ 1107.272053]  sched_balance_rq+0x714/0xc18 (F)
[ 1107.278502]  sched_balance_newidle.isra.0+0x1c0/0x408 (F)
[ 1107.285769]  pick_next_task_fair+0x58/0x310 (F)
[ 1107.292581]  __schedule+0x13c/0x918 (F)
[ 1107.298583]  schedule+0x38/0x110
[ 1107.304448]  smpboot_thread_fn+0x90/0x208 (F)
[ 1107.310822]  kthread+0x104/0x118
[ 1107.317269]  ret_from_fork+0x10/0x20
[ 1107.323922] ---[ end trace 0000000000000000 ]---
[ 1107.331245] ------------[ cut here ]------------
[ 1107.337711] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1971 enqueue_dl_entity+0x4dc/0x570
[ 1107.346972] Modules linked in: crct10dif_ce sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 fuse drm backlight ip_tables x_tables [last unloaded: ftrace_direct]
[ 1107.379887] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G        W          6.13.0-rc2 #1
[ 1107.388490] Tainted: [W]=WARN
[ 1107.394103] Hardware name: linux,dummy-virt (DT)
[ 1107.400895] pstate: a24020c9 (NzCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
[ 1107.410286] pc : enqueue_dl_entity+0x4dc/0x570
[ 1107.417196] lr : enqueue_dl_entity+0x21c/0x570
[ 1107.423700] sp : ffff8000800d3a40
[ 1107.428962] x29: ffff8000800d3a40 x28: fff00000ff6e8d80 x27: 0000000000000000
[ 1107.441295] x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000048
[ 1107.453709] x23: fff00000ff6c6d80 x22: 0000000000000001 x21: 000000000016e360
[ 1107.465918] x20: fff00000ff6c6d80 x19: fff00000ff6c76e8 x18: 0000000000000000
[ 1107.478257] x17: 0000000000000000 x16: ffff800080008000 x15: 0000000000000000
[ 1107.490615] x14: fff00000ff6e8e00 x13: 0000000000000001 x12: 0000000000002229
[ 1107.502996] x11: ffffb0af24c4a670 x10: ffff8000800d3a40 x9 : 0000000000000001
[ 1107.515024] x8 : 000000003b9aca00 x7 : 00000000000cf95d x6 : 00000000000ee6b2
[ 1107.527426] x5 : fff00000ff6c76e8 x4 : 000000003b9aca00 x3 : 000000003b9aca00
[ 1107.541958] x2 : 0000000033e57787 x1 : 0000002000000000 x0 : 0000000000000001
[ 1107.555125] Call trace:
[ 1107.560909]  enqueue_dl_entity+0x4dc/0x570 (P)
[ 1107.568530]  dl_server_start+0x4c/0x138 (F)
[ 1107.574623]  enqueue_task_fair+0x128/0x4b0 (F)
[ 1107.580979]  enqueue_task+0x44/0x80 (F)
[ 1107.586877]  activate_task+0x70/0x90 (F)
[ 1107.592854]  attach_task+0x54/0x88 (F)
[ 1107.598655]  sched_balance_rq+0x714/0xc18 (F)
[ 1107.605092]  sched_balance_newidle.isra.0+0x1c0/0x408 (F)
[ 1107.612589]  pick_next_task_fair+0x58/0x310 (F)
[ 1107.619724]  __schedule+0x13c/0x918 (F)
[ 1107.626871]  schedule+0x38/0x110
[ 1107.633403]  smpboot_thread_fn+0x90/0x208 (F)
[ 1107.641197]  kthread+0x104/0x118
[ 1107.647508]  ret_from_fork+0x10/0x20
[ 1107.653843] ---[ end trace 0000000000000000 ]---

Re: [GIT PULL] sched/urgent for v6.13-rc3

[Borislav Petkov]

+ some more folks

On Sat, Dec 14, 2024 at 12:36:07PM -0500, Sasha Levin wrote:
> On Mon, Dec 09, 2024 at 10:48:22AM +0100, Borislav Petkov wrote:
> > Hi Linus,
> > 
> > please pull the sched/urgent lineup for v6.13-rc3.
> 
> Hey Boris,
> 
> I'm a bit late to this party, but I've started seeing the following
> warning. I'm not 100% sure that this PR is the culprit because Linus
> ended up pulling it before I could run tests on it, but I haven't seen
> this warning before.

Reverting makes it go silent again I presume?

The only deadline patch in there is:

22368fe1f9bb ("sched/deadline: Fix replenish_dl_new_period dl_server condition")

 
> [ 1107.003243] ------------[ cut here ]------------
> [ 1107.010677] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x4a8/0x570
> [ 1107.021252] Modules linked in: crct10dif_ce sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 fuse drm backlight ip_tables x_tables [last unloaded: ftrace_direct]
> [ 1107.056578] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.13.0-rc2 #1
> [ 1107.064302] Hardware name: linux,dummy-virt (DT)
> [ 1107.071887] pstate: a24020c9 (NzCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
> [ 1107.080224] pc : enqueue_dl_entity+0x4a8/0x570
> [ 1107.086456] lr : return_to_handler+0x0/0x48
> [ 1107.093564] sp : ffff8000800d3a40
> [ 1107.098945] x29: ffff8000800d3a40 x28: fff00000ff6e8d80 x27: 0000000000000000
> [ 1107.112664] x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000048
> [ 1107.125440] x23: fff00000ff6c6d80 x22: 0000000000000001 x21: 000000000016e360
> [ 1107.137742] x20: 0000000000000001 x19: fff00000ff6c76e8 x18: 0000000000000000
> [ 1107.150485] x17: 0000000000000000 x16: ffff800080008000 x15: 0000000000000000
> [ 1107.163991] x14: fff00000ff6e8e00 x13: 0000000000000001 x12: 0000000000002229
> [ 1107.174756] x11: ffffb0af24c4a670 x10: ffff8000800d3a70 x9 : ffffb0af227176d0
> [ 1107.187747] x8 : ffff8000800d38d8 x7 : 0000000002d37310 x6 : fff00000c6d27500
> [ 1107.200948] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
> [ 1107.215525] x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
> [ 1107.228386] Call trace:
> [ 1107.233927]  enqueue_dl_entity+0x4a8/0x570 (P)
> [ 1107.240669]  dl_server_start+0x4c/0x138 (F)
> [ 1107.246980]  enqueue_task_fair+0x128/0x4b0 (F)
> [ 1107.253826]  enqueue_task+0x44/0x80 (F)
> [ 1107.259958]  activate_task+0x70/0x90 (F)
> [ 1107.265928]  attach_task+0x54/0x88 (F)
> [ 1107.272053]  sched_balance_rq+0x714/0xc18 (F)
> [ 1107.278502]  sched_balance_newidle.isra.0+0x1c0/0x408 (F)
> [ 1107.285769]  pick_next_task_fair+0x58/0x310 (F)
> [ 1107.292581]  __schedule+0x13c/0x918 (F)
> [ 1107.298583]  schedule+0x38/0x110
> [ 1107.304448]  smpboot_thread_fn+0x90/0x208 (F)
> [ 1107.310822]  kthread+0x104/0x118
> [ 1107.317269]  ret_from_fork+0x10/0x20
> [ 1107.323922] ---[ end trace 0000000000000000 ]---
> [ 1107.331245] ------------[ cut here ]------------
> [ 1107.337711] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1971 enqueue_dl_entity+0x4dc/0x570
> [ 1107.346972] Modules linked in: crct10dif_ce sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 fuse drm backlight ip_tables x_tables [last unloaded: ftrace_direct]
> [ 1107.379887] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G        W          6.13.0-rc2 #1
> [ 1107.388490] Tainted: [W]=WARN
> [ 1107.394103] Hardware name: linux,dummy-virt (DT)
> [ 1107.400895] pstate: a24020c9 (NzCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
> [ 1107.410286] pc : enqueue_dl_entity+0x4dc/0x570
> [ 1107.417196] lr : enqueue_dl_entity+0x21c/0x570
> [ 1107.423700] sp : ffff8000800d3a40
> [ 1107.428962] x29: ffff8000800d3a40 x28: fff00000ff6e8d80 x27: 0000000000000000
> [ 1107.441295] x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000048
> [ 1107.453709] x23: fff00000ff6c6d80 x22: 0000000000000001 x21: 000000000016e360
> [ 1107.465918] x20: fff00000ff6c6d80 x19: fff00000ff6c76e8 x18: 0000000000000000
> [ 1107.478257] x17: 0000000000000000 x16: ffff800080008000 x15: 0000000000000000
> [ 1107.490615] x14: fff00000ff6e8e00 x13: 0000000000000001 x12: 0000000000002229
> [ 1107.502996] x11: ffffb0af24c4a670 x10: ffff8000800d3a40 x9 : 0000000000000001
> [ 1107.515024] x8 : 000000003b9aca00 x7 : 00000000000cf95d x6 : 00000000000ee6b2
> [ 1107.527426] x5 : fff00000ff6c76e8 x4 : 000000003b9aca00 x3 : 000000003b9aca00
> [ 1107.541958] x2 : 0000000033e57787 x1 : 0000002000000000 x0 : 0000000000000001
> [ 1107.555125] Call trace:
> [ 1107.560909]  enqueue_dl_entity+0x4dc/0x570 (P)
> [ 1107.568530]  dl_server_start+0x4c/0x138 (F)
> [ 1107.574623]  enqueue_task_fair+0x128/0x4b0 (F)
> [ 1107.580979]  enqueue_task+0x44/0x80 (F)
> [ 1107.586877]  activate_task+0x70/0x90 (F)
> [ 1107.592854]  attach_task+0x54/0x88 (F)
> [ 1107.598655]  sched_balance_rq+0x714/0xc18 (F)
> [ 1107.605092]  sched_balance_newidle.isra.0+0x1c0/0x408 (F)
> [ 1107.612589]  pick_next_task_fair+0x58/0x310 (F)
> [ 1107.619724]  __schedule+0x13c/0x918 (F)
> [ 1107.626871]  schedule+0x38/0x110
> [ 1107.633403]  smpboot_thread_fn+0x90/0x208 (F)
> [ 1107.641197]  kthread+0x104/0x118
> [ 1107.647508]  ret_from_fork+0x10/0x20
> [ 1107.653843] ---[ end trace 0000000000000000 ]---

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [GIT PULL] sched/urgent for v6.13-rc3

[Peter Zijlstra]

On Sat, Dec 14, 2024 at 12:36:07PM -0500, Sasha Levin wrote:
> On Mon, Dec 09, 2024 at 10:48:22AM +0100, Borislav Petkov wrote:
> > Hi Linus,
> > 
> > please pull the sched/urgent lineup for v6.13-rc3.
> 
> Hey Boris,
> 
> I'm a bit late to this party, but I've started seeing the following
> warning. I'm not 100% sure that this PR is the culprit because Linus
> ended up pulling it before I could run tests on it, but I haven't seen
> this warning before.
> 
> [ 1107.003243] ------------[ cut here ]------------
> [ 1107.010677] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x4a8/0x570

Ah, yeah, no. That's a known issue which we *finally* managed to track
down last week. Unfortunately this sched/urgent pull does not yet
include those patches.

If you want them, they can be had here:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent

I was meaning to push them to tip/sched/urgent on Monday, so they'd be
in next week's batch.

But if people want them now, have at :-)

Re: [GIT PULL] sched/urgent for v6.13-rc3

[Peter Zijlstra]

On Sat, Dec 14, 2024 at 07:05:37PM +0100, Peter Zijlstra wrote:
> On Sat, Dec 14, 2024 at 12:36:07PM -0500, Sasha Levin wrote:
> > On Mon, Dec 09, 2024 at 10:48:22AM +0100, Borislav Petkov wrote:
> > > Hi Linus,
> > > 
> > > please pull the sched/urgent lineup for v6.13-rc3.
> > 
> > Hey Boris,
> > 
> > I'm a bit late to this party, but I've started seeing the following
> > warning. I'm not 100% sure that this PR is the culprit because Linus
> > ended up pulling it before I could run tests on it, but I haven't seen
> > this warning before.
> > 
> > [ 1107.003243] ------------[ cut here ]------------
> > [ 1107.010677] WARNING: CPU: 0 PID: 16 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x4a8/0x570
> 
> Ah, yeah, no. That's a known issue which we *finally* managed to track
> down last week. Unfortunately this sched/urgent pull does not yet
> include those patches.
> 
> If you want them, they can be had here:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent
> 
> I was meaning to push them to tip/sched/urgent on Monday, so they'd be
> in next week's batch.

/me finds that the robots have blessed them and it's only Saturday, so I
could push them into tip now and then they go to Linus tomorrow.

Yep, let me do that.

Re: Re: [GIT PULL] sched/urgent for v6.13-rc3

[pr-tracker-bot]

The pull request you sent on Sat, 14 Dec 2024 19:05:37 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/acd855a949fc168f5cefe643ed4875a052b66060

Thank you!

-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/prtracker.html