Re: [PATCH] sysctl: Add a feature to drop caches selectively

Artem Bityutskiy
2014-06-25T13:30:28Z

On Wed, 2014-06-25 at 15:23 +0200, Thomas Knauth wrote:
> On Wed, Jun 25, 2014 at 11:56 AM, Artem Bityutskiy <dedekind1@gmail.com> wrote:
> > Thanks for the answer, although you forgot to comment on the question
> > about possibly extending the new interface to work with file ranges in
> > the future. For example, I have a 2 TiB file, and I am only interested
> > in dropping caches for the first couple of gigabytes. Would I extend
> > your interface, or would I come up with another one?
>
> Ah, didn't quite understand what was meant with file ranges. Again, we
> had not considered this so far. I guess you could make a distinction
> between directories and files here. If the path points to a file, you
> can have an optional argument indicating the range of bytes you would
> like to drop. Something like
>
> echo "my-file 0-1000,8000-1000" > /proc/sys/vm/sdrop_cache
>
> If this is desirable, we can add it to the patch.

No, I do not ask to implement this, just trying to understand how the
interface could possibly be extended.

--
Best Regards,
Artem Bityutskiy