Displaying 4 results from an estimated 4 matches for "trace_lock_acquire".
2020 Aug 11
2
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
On 11.08.20 10:12, Peter Zijlstra wrote:
> On Tue, Aug 11, 2020 at 09:57:55AM +0200, J?rgen Gro? wrote:
>> On 11.08.20 09:41, Peter Zijlstra wrote:
>>> On Fri, Aug 07, 2020 at 05:19:03PM +0200, Marco Elver wrote:
>>>
>>>> My hypothesis here is simply that kvm_wait() may be called in a place
>>>> where we get the same case I mentioned to Peter,
2020 Aug 11
2
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
On 11.08.20 10:12, Peter Zijlstra wrote:
> On Tue, Aug 11, 2020 at 09:57:55AM +0200, J?rgen Gro? wrote:
>> On 11.08.20 09:41, Peter Zijlstra wrote:
>>> On Fri, Aug 07, 2020 at 05:19:03PM +0200, Marco Elver wrote:
>>>
>>>> My hypothesis here is simply that kvm_wait() may be called in a place
>>>> where we get the same case I mentioned to Peter,
2020 Aug 11
3
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
...t is, most of these irq-tracking problem are new because commit:
859d069ee1dd ("lockdep: Prepare for NMI IRQ state tracking")
changed irq-tracking to ignore the lockdep recursion count.
This then allows:
lock_acquire()
raw_local_irq_save();
current->lockdep_recursion++;
trace_lock_acquire()
... tracing ...
#PF under raw_local_irq_*()
__lock_acquire()
arch_spin_lock(&graph_lock)
pv-spinlock-wait()
local_irq_save() under raw_local_irq_*()
However afaict that just made a bad situation worse. There already were
issues, take for example:
trace_c...
2020 Aug 11
3
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
...t is, most of these irq-tracking problem are new because commit:
859d069ee1dd ("lockdep: Prepare for NMI IRQ state tracking")
changed irq-tracking to ignore the lockdep recursion count.
This then allows:
lock_acquire()
raw_local_irq_save();
current->lockdep_recursion++;
trace_lock_acquire()
... tracing ...
#PF under raw_local_irq_*()
__lock_acquire()
arch_spin_lock(&graph_lock)
pv-spinlock-wait()
local_irq_save() under raw_local_irq_*()
However afaict that just made a bad situation worse. There already were
issues, take for example:
trace_c...