From: Simon Paillard <spaillard-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
To: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: shmget.2: SHMALL & kernel version inconsistency ?
Date: Mon, 28 Apr 2014 00:09:16 +0200 [thread overview]
Message-ID: <20140427220916.GP18563@mraw.org> (raw)
Hi,
From shmget.2:
=======================================================================
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‐
nel/shmall.
=======================================================================
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
--
Simon Paillard
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next reply other threads:[~2014-04-27 22:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-27 22:09 Simon Paillard [this message]
[not found] ` <20140427220916.GP18563-xazfMhTT2R0@public.gmane.org>
2014-04-28 7:39 ` shmget.2: SHMALL & kernel version inconsistency ? Michael Kerrisk (man-pages)
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