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Merge branch 'csd.2020.09.04a' into HEAD

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csd.2020.09.04a: CPU smp_call_function() torture tests.
This commit is contained in:
Paul E. McKenney
2020-09-04 11:54:52 -07:00
parent 7fbe67e46a 2b722160f1
commit 6fe208f63a
6 changed files with 160 additions and 1 deletions
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11
lib/Kconfig.debug
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@@ -1377,6 +1377,17 @@ config SCF_TORTURE_TEST
module may be built after the fact on the running kernel to
be tested, if desired.
config CSD_LOCK_WAIT_DEBUG
bool "Debugging for csd_lock_wait(), called from smp_call_function*()"
depends on DEBUG_KERNEL
depends on 64BIT
default n
help
This option enables debug prints when CPUs are slow to respond
to the smp_call_function*() IPI wrappers. These debug prints
include the IPI handler function currently executing (if any)
and relevant stack traces.
endmenu # lock debugging
config TRACE_IRQFLAGS

6
lib/nmi_backtrace.c
View File

@@ -85,12 +85,16 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
put_cpu();
}
// Dump stacks even for idle CPUs.
static bool backtrace_idle;
module_param(backtrace_idle, bool, 0644);
bool nmi_cpu_backtrace(struct pt_regs *regs)
{
int cpu = smp_processor_id();
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
if (regs && cpu_in_idle(instruction_pointer(regs))) {
if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) {
pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n",
cpu, (void *)instruction_pointer(regs));
} else {