Re: [PATCH] sh: add support for TIF_NOTIFY_SIGNAL

[Jens Axboe <axboe@kernel.dk>]

On 1/1/21 11:16 AM, John Paul Adrian Glaubitz wrote:
> On 1/1/21 4:35 PM, Jens Axboe wrote:> It's supposed to finish very quickly:
>>
>> axboe@p1 ~> time ./socket-rw                                                             0.000s
>>
>> ________________________________________________________
>> Executed in    1.10 millis    fish           external 
>>    usr time  888.00 micros  278.00 micros  610.00 micros 
>>    sys time   35.00 micros   35.00 micros    0.00 micros 
>>
>> If it doesn't, can you try:
>>
>> # echo 1 > /sys/kernel/debug/tracing/events/io_uring/enable
>>
>> Then run the socket-rw app, and then do:
>>
>> # cat /sys/kernel/debug/tracing/trace
>>
>> and send that output? Might also be useful to include the strace
>> of the socket-rw just in case, so maybe run it ala
>>
>> strace -o foo ./socket-rw
>>
>> and include foo in the reply as well.
> 
> Odd, I just ran it through strace and it exited immediately:

That looks correct, it sets up a ring, issues and waits for two
requests. Both of those requests require TWA_SIGNAL processing.

-- 
Jens Axboe