linux-kernel - Re: remap_file

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Message-ID: <CAMSv6X37NL0JHQgtbhqdNXM_-bCcxK42YQDHqA9m=uMj3SAZxQ@mail.gmail.com>
Date:	Tue, 20 May 2014 00:05:34 +0200
From:	Armin Rigo <arigo@...es.org>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	Kenny Simpson <theonetruekenny@...il.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: remap_file_pages() use

Hi Dave,

On 19 May 2014 19:50, Dave Hansen <dave.hansen@...el.com> wrote:
> We keep the current count as mm->map_count in the kernel, and the limit
> is available because it's a sysctl.  It wouldn't be hard to dump
> mm->map_count out in a /proc file somewhere if it would be useful to
> you.  Would that work, or is there some other interface that would be
> more convenient?

We can keep an in-process estimate of this value anyway.  The sysctl
to get vm.max_map_count is all we need.  That is, unless the limit is
moved to be per-user instead of per-process, as I think was discussed
here --- which would complicate further our job :-/


A bientôt,

Armin.
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