On Fri, Mar 12, 2021 at 11:48 AM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> - Make IO threads unfreezable by default, on account of a bug report
> that had them spinning on resume. Honestly not quite sure why thawing
> leaves us with a perpetual signal pending (causing the spin), but for
> now make them unfreezable like there were in 5.11 and prior.
That "not quite sure" doesn't exactly give my the warm and fuzzies,
but not being new is ok, I guess. But I'd really like you to try to
figure out what is actually going on.
I'm _guessing_ it's just that now those threads are user threads, and
then the freezing logic expects them to freeze/thaw using a signal
machinery or something like that. And that doesn't work when there is
no signal handling for those threads.
But it would be good to _know_.
Linus
