On 1/1/21 8:30 AM, John Paul Adrian Glaubitz wrote: > Hi Jens! > > On 1/1/21 4:08 PM, Jens Axboe wrote: >> On 1/1/21 7:06 AM, John Paul Adrian Glaubitz wrote: >>> Is there away to test the change itself? >> >> The only user of TWA_SIGNAL, which uses TIF_NOTIFY_SIGNAL, so far is io_uring. >> You need something that triggers deferred task_work processing, which is >> basically anything that ends up being poll driven for data/space readiness. >> Here's a small test app from the liburing test suite, that'll trigger it. >> >> If you install liburing, compile with: >> >> gcc -Wall -O2 -o socket-rw socket-rw.c -luring >> >> and run it without any arguments. > > How long is this test supposed to run? It's already been running for some minutes > on my 600 MHz machine. 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. -- Jens Axboe
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