linux-kernel - Re: [PATCH RFC] fs/fcntl: add fcntl F_GET

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Message-ID: <87ftjd6mvj.fsf@mid.deneb.enyo.de>
Date:   Mon, 28 Oct 2019 14:05:52 +0100
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Roman Gushchin <guro@...com>
Subject: 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.

I meant a 32-bit process running on a 64-bit kernel.