Re: [PATCH 2/2] block: create ioctl to discard-or-zeroout a range of blocks

Jeff Moyer
2016-03-18T15:15:32Z

"Theodore Ts'o" <tytso@mit.edu> writes:

> I do think that using TRIM in various causes where we are doing an
> fallocate does make sense for non-rotational devices. In general TRIM
> should be fast enough that that I'd be surprised that people would be
> complaining --- especially since most of the time, fallocate isn't on
> the timing-critical path of most applications.

TRIM/UNMAP isn't just supported on solid state devices, though. I do
recall some enterprise thinly provisioned storage that would take ages
to discard large regions. I think that caused us to change the defaults
for mkfs, right?

Cheers,
Jeff