On Fri, Dec 20, 2019 at 10:23:50AM +0100, Lennart Poettering wrote:
> On Do, 19.12.19 16:42, Ben Cotton (bcotton@xxxxxxxxxx) wrote:
>
> > Over time, some users experience slow downs in certain flash storage
> > devices. This might be alleviated by issuing a periodic fstrim command
> > to the mounted file system. Devices and file systems that don't
> > support fstrim are unaffected.
>
> So, if this is desirable, why doesn't the kernel do this on its own?
When?
You can use "mount/swapon -o discard" to do it on-the-fly, but in some
cases it's bad idea and it's better to keep it in user's hands.
> Why do we need a userspace component that just gets an event from the
> kernel and then tells the kernel to do something?
It does not get any event from kernel. It starts in specified time
operation which may be unwanted in another time.
> If this is generally
> desirable, why is something as trivial as that not a kernel
> functionality anyway?
You want to ask at LKML ;-)
(CC: to Lukas who is cares about it in kernel)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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