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* [to-be-updated] hung_task-log-summary-line-when-warning-budget-is-exhausted.patch removed from -mm tree
@ 2026-10-04 18:21 Andrew Morton
  0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2026-10-04 18:21 UTC (permalink / raw)
  To: mm-commits, atomlin, akpm


The quilt patch titled
     Subject: hung_task: log summary line when warning budget is exhausted
has been removed from the -mm tree.  Its filename was
     hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Aaron Tomlin <atomlin@atomlin.com>
Subject: hung_task: log summary line when warning budget is exhausted
Date: Sat, 29 Aug 2026 10:53:21 -0400

Once the warning budget is exhausted, hung_task_info() normally stops
printing per-task details.  When panic is triggered, full details are
still printed so diagnostics remain available before panic.

To retain visibility without restoring per-task output after budget
exhaustion, emit a single aggregate summary line at the end of each
watchdog scan that detects hung tasks with an exhausted budget.  This
keeps non-panic per-task reports budgeted during system-wide hangs.

Link: https://lore.kernel.org/20260829145321.18423-3-atomlin@atomlin.com
Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: Petr Mladek <pmladek@suse.com>
Suggested-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
---

 kernel/hung_task.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/kernel/hung_task.c~hung_task-log-summary-line-when-warning-budget-is-exhausted
+++ a/kernel/hung_task.c
@@ -277,7 +277,7 @@ static void hung_task_info(struct task_s
 		debug_show_blocker(t, timeout);
 
 		if (!hung_task_warnings_budget)
-			pr_info("Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings\n");
+			pr_info("hung_task: further per-task details suppressed until warning budget is reset or panic is triggered (see sysctl kernel.hung_task_warnings)\n");
 	}
 
 	touch_nmi_watchdog();
@@ -363,6 +363,10 @@ static void check_hung_uninterruptible_t
 		return;
 	}
 
+	if (!hung_task_warnings_budget && !hung_task_call_panic)
+		pr_info("hung_task: %lu hung tasks detected, warning budget exhausted\n",
+			this_round_count);
+
 	if (need_warning || hung_task_call_panic) {
 		si_mask |= SYS_INFO_LOCKS;
 
_

Patches currently in -mm which might be from atomlin@atomlin.com are



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2026-10-04 18:21 [to-be-updated] hung_task-log-summary-line-when-warning-budget-is-exhausted.patch removed from -mm tree Andrew Morton

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