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55 lines
1.8 KiB
55 lines
1.8 KiB
From: Jeff Mahoney <jeffm@suse.com>
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Subject: hung_task_timeout: configurable default
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References: bnc#552820
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Patch-mainline: not yet
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This patch allows the default value for sysctl_hung_task_timeout_secs
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to be set at build time. The feature carries virtually no overhead,
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so it makes sense to keep it enabled. On heavily loaded systems, though,
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it can end up triggering stack traces when there is no bug other than
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the system being underprovisioned.
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The old default of 120 seconds is preserved.
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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
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---
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kernel/hung_task.c | 3 ++-
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lib/Kconfig.debug | 14 ++++++++++++++
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2 files changed, 16 insertions(+), 1 deletion(-)
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--- a/kernel/hung_task.c
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+++ b/kernel/hung_task.c
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@@ -33,7 +33,8 @@ unsigned long __read_mostly sysctl_hung_
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/*
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* Zero means infinite timeout - no checking done:
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*/
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-unsigned long __read_mostly sysctl_hung_task_timeout_secs = 120;
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+unsigned long __read_mostly sysctl_hung_task_timeout_secs =
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+ CONFIG_DEFAULT_HUNG_TASK_TIMEOUT;
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unsigned long __read_mostly sysctl_hung_task_warnings = 10;
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--- a/lib/Kconfig.debug
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+++ b/lib/Kconfig.debug
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@@ -214,6 +214,20 @@ config DETECT_HUNG_TASK
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enabled then all held locks will also be reported. This
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feature has negligible overhead.
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+config DEFAULT_HUNG_TASK_TIMEOUT
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+ int "Default timeout for hung task detection (in seconds)"
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+ depends on DETECT_HUNG_TASK
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+ default 120
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+ help
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+ This option controls the default timeout (in seconds) used
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+ to determine when a task has become non-responsive and should
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+ be considered hung.
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+
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+ It can be adjusted at runtime via the kernel.hung_task_timeout
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+ sysctl or by writing a value to /proc/sys/kernel/hung_task_timeout.
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+
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+ A timeout of 0 disables the check. The default is 120 seconds.
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+
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config BOOTPARAM_HUNG_TASK_PANIC
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bool "Panic (Reboot) On Hung Tasks"
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depends on DETECT_HUNG_TASK
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