From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Weimer Subject: Re: [PATCH RFC] fs/fcntl: add fcntl F_GET_RSS Date: Mon, 28 Oct 2019 14:05:52 +0100 Message-ID: <87ftjd6mvj.fsf@mid.deneb.enyo.de> References: <157225848971.557.16257813537984792761.stgit@buzz> <87k18p6qjk.fsf@mid.deneb.enyo.de> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: (Konstantin Khlebnikov's message of "Mon, 28 Oct 2019 15:55:19 +0300") Sender: linux-kernel-owner@vger.kernel.org To: Konstantin Khlebnikov Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Michal Hocko , Alexander Viro , Johannes Weiner , Andrew Morton , Linus Torvalds , Roman Gushchin List-Id: linux-api@vger.kernel.org * 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.