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build: Add additional kernel debug options

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Make it possible to activate some additional kernel debug options.
This can be used to debug some problems in kernel drivers.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
This commit is contained in:
Hauke Mehrtens 2020-02-12 11:49:02 +01:00 committed by Hauke Mehrtens
parent 947d2e0a70
commit b951f53fba
3 changed files with 78 additions and 0 deletions
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68
config/Config-kernel.in
View File

@ -377,6 +377,74 @@ config KERNEL_PROVE_LOCKING
select KERNEL_DEBUG_KERNEL
default n
config KERNEL_LOCKUP_DETECTOR
bool "Compile the kernel with detect Hard and Soft Lockups"
depends on KERNEL_DEBUG_KERNEL
help
Say Y here to enable the kernel to act as a watchdog to detect
hard and soft lockups.
Softlockups are bugs that cause the kernel to loop in kernel
mode for more than 20 seconds, without giving other tasks a
chance to run. The current stack trace is displayed upon
detection and the system will stay locked up.
Hardlockups are bugs that cause the CPU to loop in kernel mode
for more than 10 seconds, without letting other interrupts have a
chance to run. The current stack trace is displayed upon detection
and the system will stay locked up.
The overhead should be minimal. A periodic hrtimer runs to
generate interrupts and kick the watchdog task every 4 seconds.
An NMI is generated every 10 seconds or so to check for hardlockups.
The frequency of hrtimer and NMI events and the soft and hard lockup
thresholds can be controlled through the sysctl watchdog_thresh.
config KERNEL_DETECT_HUNG_TASK
bool "Compile the kernel with detect Hung Tasks"
depends on KERNEL_DEBUG_KERNEL
default KERNEL_LOCKUP_DETECTOR
help
Say Y here to enable the kernel to detect "hung tasks",
which are bugs that cause the task to be stuck in
uninterruptible "D" state indefinitely.
When a hung task is detected, the kernel will print the
current stack trace (which you should report), but the
task will stay in uninterruptible state. If lockdep is
enabled then all held locks will also be reported. This
feature has negligible overhead.
config KERNEL_WQ_WATCHDOG
bool "Compile the kernel with detect Workqueue Stalls"
depends on KERNEL_DEBUG_KERNEL
help
Say Y here to enable stall detection on workqueues. If a
worker pool doesn't make forward progress on a pending work
item for over a given amount of time, 30s by default, a
warning message is printed along with dump of workqueue
state. This can be configured through kernel parameter
"workqueue.watchdog_thresh" and its sysfs counterpart.
config KERNEL_DEBUG_ATOMIC_SLEEP
bool "Compile the kernel with sleep inside atomic section checking"
depends on KERNEL_DEBUG_KERNEL
help
If you say Y here, various routines which may sleep will become very
noisy if they are called inside atomic sections: when a spinlock is
held, inside an rcu read side critical section, inside preempt disabled
sections, inside an interrupt, etc...
config KERNEL_DEBUG_VM
bool "Compile the kernel with debug VM"
depends on KERNEL_DEBUG_KERNEL
help
Enable this to turn on extended checks in the virtual-memory system
that may impact performance.
If unsure, say N.
config KERNEL_PRINTK_TIME
bool "Enable printk timestamps"
default y

5
target/linux/generic/config-4.14
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@ -594,6 +594,7 @@ CONFIG_BLOCK=y
# CONFIG_BONDING is not set
# CONFIG_BOOKE_WDT is not set
CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
# CONFIG_BOOT_PRINTK_DELAY is not set
CONFIG_BOOT_RAW=y
CONFIG_BPF=y
@ -1073,6 +1074,9 @@ CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_UART_BCM63XX is not set
# CONFIG_DEBUG_VIRTUAL is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_VM_PGFLAGS is not set
# CONFIG_DEBUG_VM_RB is not set
# CONFIG_DEBUG_VM_VMACACHE is not set
# CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
# CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
# CONFIG_DEBUG_WX is not set
@ -1081,6 +1085,7 @@ CONFIG_DEBUG_KERNEL=y
CONFIG_DEFAULT_CUBIC=y
CONFIG_DEFAULT_DEADLINE=y
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
CONFIG_DEFAULT_IOSCHED="deadline"
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
# CONFIG_DEFAULT_NOOP is not set

5
target/linux/generic/config-4.19
View File

@ -617,6 +617,7 @@ CONFIG_BLOCK=y
# CONFIG_BONDING is not set
# CONFIG_BOOKE_WDT is not set
CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
# CONFIG_BOOT_PRINTK_DELAY is not set
CONFIG_BOOT_RAW=y
CONFIG_BPF=y
@ -1131,6 +1132,9 @@ CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_UART_BCM63XX is not set
# CONFIG_DEBUG_VIRTUAL is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_VM_PGFLAGS is not set
# CONFIG_DEBUG_VM_RB is not set
# CONFIG_DEBUG_VM_VMACACHE is not set
# CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
# CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
# CONFIG_DEBUG_WX is not set
@ -1139,6 +1143,7 @@ CONFIG_DEBUG_KERNEL=y
CONFIG_DEFAULT_CUBIC=y
CONFIG_DEFAULT_DEADLINE=y
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
CONFIG_DEFAULT_IOSCHED="deadline"
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
# CONFIG_DEFAULT_NOOP is not set