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
--
To unsubscribe from this list: send the line "unsubscribe linux-man" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
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)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140427220916.GP18563@mraw.org \
--to=spaillard-8fiuurrzop0dnm+yrofe0a@public.gmane.org \
--cc=linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).