Re: extended bpf_send_signal_thread with argument

2021-02-01 Thread Peter Zijlstra
On Mon, Feb 01, 2021 at 10:42:47AM +0100, Dmitry Vyukov wrote: > On Mon, Feb 1, 2021 at 10:22 AM Peter Zijlstra wrote: > > > > On Sun, Jan 31, 2021 at 12:14:02PM +0100, Dmitry Vyukov wrote: > > > Hi, > > > > > > I would like to send a signal from a bpf program invoked from a > > > perf_event. Ther

Re: extended bpf_send_signal_thread with argument

2021-02-01 Thread Dmitry Vyukov
On Mon, Feb 1, 2021 at 10:22 AM Peter Zijlstra wrote: > > On Sun, Jan 31, 2021 at 12:14:02PM +0100, Dmitry Vyukov wrote: > > Hi, > > > > I would like to send a signal from a bpf program invoked from a > > perf_event. There is: > > You can't. Sending signals requires sighand lock, and you're not al

Re: extended bpf_send_signal_thread with argument

2021-02-01 Thread Peter Zijlstra
On Sun, Jan 31, 2021 at 12:14:02PM +0100, Dmitry Vyukov wrote: > Hi, > > I would like to send a signal from a bpf program invoked from a > perf_event. There is: You can't. Sending signals requires sighand lock, and you're not allowed to take locks from perf_event context.

extended bpf_send_signal_thread with argument

2021-01-31 Thread Dmitry Vyukov
Hi, I would like to send a signal from a bpf program invoked from a perf_event. There is: // kernel/trace/bpf_trace.c BPF_CALL_1(bpf_send_signal_thread, u32, sig) which is nice, but it does not allow me to pass any arguments. I can use a bpf map indexed by pid to "pass" some additional info, but