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

From: Konstantin Khlebnikov
Date: Mon Oct 28 2019 - 08:55:29 EST

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.