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Message-ID: <CAMSv6X1-17HMTO=b6QOZA0Xm1combFxV4wuX1gPMUqC02EKrJA@mail.gmail.com>
Date: Mon, 19 May 2014 17:42:37 +0200
From: Armin Rigo <arigo@...es.org>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: 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 Kirill,
On 19 May 2014 17:17, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> IIUC PyPy uses the syscall in some early prototype and looks like guys are
> okay to rework it to mmap() if default sysctl_max_map_count will be high
> enough.
Yes, we can switch easily if needed. The syscall is not in any
"production" version yet.
Please note that "high enough" in this context means higher than
2**20. We need it high enough to handle regularly 10-20% of all the
RAM used by each program. If I count correctly, at 20%, 2**20 fails
above 20GB. In general I would suggest to use a default limit that
depends on the amount of RAM (+swap) available.
A bientôt,
Armin.
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