Re: [PATCH RFC] fs/fcntl: add fcntl F_GET_RSS

[Konstantin Khlebnikov]

On 28/10/2019 14.46, Florian Weimer wrote:
> * Konstantin Khlebnikov:
>
> > This implements fcntl() for getting amount of resident memory in cache.
> > Kernel already maintains counter for each inode, this patch just exposes
> > it into userspace. Returned size is in kilobytes like values in procfs.
>
> I think this needs a 32-bit compat implementation which clamps the
> returned value to INT_MAX.

32-bit machine couldn't hold more than 2TB cache in one file.
Even radix tree wouldn't fit into low memory area.