linux-kernel - Re: [PATCH] mm: disable `vm.max_map

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Message-ID: <20171127194753.GB28115@avx2>
Date:   Mon, 27 Nov 2017 22:47:53 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     mikpelinux@...il.com
Cc:     linux-kernel@...r.kernel.org, mhocko@...nel.org,
        willy@...radead.org, ak@...ux.intel.com, linux-mm@...ck.org
Subject: Re: [PATCH] mm: disable `vm.max_map_count' sysctl limit

	[resent because I can't type]

> vm.max_map_count

I always thought it is some kind of algorithmic complexity limiter and
kernel memory limiter. VMAs are under SLAB_ACCOUNT nowadays but ->mmap
list stays:

	$ chgrep -e 'for.*vma = vma->vm_next' | wc -l
	41

In particular readdir on /proc/*/map_files .

I'm saying you can not simply remove this sysctl.