Re: strace of io_uring events?

On Wed, Jul 15, 2020 at 06:11:30PM +0100, Matthew Wilcox wrote:

On Wed, Jul 15, 2020 at 07:35:50AM -0700, Andy Lutomirski wrote:

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On Jul 15, 2020, at 4:12 AM, Miklos Szeredi [off-list ref] wrote:
This thread is to discuss the possibility of stracing requests
submitted through io_uring.   I'm not directly involved in io_uring
development, so I'm posting this out of  interest in using strace on
processes utilizing io_uring.

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Is there some existing tracing infrastructure that strace could use to
get async completion events?  Should we be introducing one?

I suspect the best approach to use here is use eBPF, since since
sending asyncronously to a ring buffer is going to be *way* more
efficient than using the blocking ptrace(2) system call...

	       	     	 	  	    - Ted