From mboxrd@z Thu Jan  1 00:00:00 1970
From: Simon Paillard <spaillard-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
Subject: shmget.2: SHMALL & kernel version inconsistency ?
Date: Mon, 28 Apr 2014 00:09:16 +0200
Message-ID: <20140427220916.GP18563@mraw.org>
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Hi,

=46rom shmget.2:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
SHMALL System wide maximum of shared memory pages.   Since  Linux  2.2,
       the default value for this limit is

           SHMMAX / PAGE_SIZE * (SHMMNI / 16)

       Assuming  a 4kB page size, this formula yields (since Linux 2.4)
       the value 2^20 (2,097,152).

       On Linux, this limit can be read and modified via /proc/sys/ker=E2=
=80=90
       nel/shmall.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Linux 2.2 or 2.4 ?

I understand from lxr contant this is actually 2.4.
http://lxr.linux.no/#linux-old+v2.2.0/include/linux/shm.h#L53
http://lxr.linux.no/#linux-old+v2.4.0/include/linux/shm.h#L15

--=20
Simon Paillard
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