linux-kernel - Re: [RFC PATCH 1/5] mm: intorduce __GFP_UNMAPPED and unmapped

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Date:   Tue, 28 Mar 2023 18:37:13 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Mike Rapoport <rppt@...nel.org>, Michal Hocko <mhocko@...e.com>,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Song Liu <song@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-modules@...r.kernel.org,
        Pankaj Raghav <p.raghav@...sung.com>,
        Daniel Gomez <da.gomez@...sung.com>,
        "kbus >> Keith Busch" <kbusch@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Adam Manzanares <a.manzanares@...sung.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC PATCH 1/5] mm: intorduce __GFP_UNMAPPED and unmapped_alloc()

On Tue, Mar 28, 2023 at 10:18:50AM -0700, Luis Chamberlain wrote:
> differences with eBPF programs is that modules *can* be rather large
> in size. What is the average size of modules? Well let's take a look:
> 
> mcgrof@...twin /mirror/code/mcgrof/linux-next (git::master)$ find ./
> -name \*.ko| wc -l
> 9173

ummm ... wc -c, surely?

> mcgrof@...twin /mirror/code/mcgrof/linux-next (git::master)$ find ./
> -name \*.ko|  xargs stat -c "%s - %n" | sort -n -k 1 -r | tail
> -$((9173-5)) | awk 'BEGIN {sum=0} {sum+=$1} END {print sum/NR/1024}'
> 160.54

... which invalidates all of these.