Re: [lttng-dev] ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty

2022-06-22 Thread Mathieu Desnoyers via lttng-dev
- On Jun 22, 2022, at 3:45 AM, Minlan Wang wangmin...@szsandstone.com wrote: [...] Hi Minlan, > -- > 1.8.3.1 > > > And the lttng session is configured to trace these events: > kernel: syscall futex On the kernel side, in addition to the syscall futex, I would really like to see what happ

Re: [lttng-dev] ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty

2022-06-22 Thread Mathieu Desnoyers via lttng-dev
- On Jun 22, 2022, at 9:19 AM, Mathieu Desnoyers mathieu.desnoy...@efficios.com wrote: > - On Jun 22, 2022, at 3:45 AM, Minlan Wang wangmin...@szsandstone.com > wrote: > > [...] > > Hi Minlan, > >> -- >> 1.8.3.1 >> >> >> And the lttng session is configured to trace these events: >>

Re: [lttng-dev] ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty

2022-06-22 Thread Mathieu Desnoyers via lttng-dev
- On Jun 22, 2022, at 4:28 PM, Mathieu Desnoyers mathieu.desnoy...@efficios.com wrote: > - On Jun 22, 2022, at 9:19 AM, Mathieu Desnoyers > mathieu.desnoy...@efficios.com wrote: > >> - On Jun 22, 2022, at 3:45 AM, Minlan Wang wangmin...@szsandstone.com >> wrote: >> >> [...] >> >>

Re: [lttng-dev] ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty

2022-06-22 Thread Minlan Wang via lttng-dev
On Wed, Jun 22, 2022 at 11:45:28PM -0400, Minlan Wang wrote: > The session output is in attachment: 0623_futex-20220623-112754.tar.bz2 Hi, Mathieu, There are several workqueues in the process i tracked. The one used to trigger the issuse is this: thread with vtid=21054, and futex = 0x5652A1035C40