Re: [PATCH] pipe_read: don't wake up the writer if the pipe is still full

[Oleg Nesterov]

On 02/24, Oleg Nesterov wrote:
>
> Just in case, did you use
>
> 	https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git/tree/src/hackbench/hackbench.c
>
> ?

Or did you use another version?

Exactly what parameters did you use?

If possible, please reproduce the hang again. How many threads/processes
sleeping in pipe_read() or pipe_write() do you see? (you can look at
/proc/$pid/stack).

Please pick one sleeping writer, and do

	$ strace -p pidof_that_write

this should wake this writer up. If a missed wakeup is the only problem,
hackbench should continue.

The more info you can provide the better ;)

Oleg.