From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Manfred Spraul <manfred@colorfullife.com>,
Davidlohr Bueso <davidlohr@hp.com>
Cc: mtk.manpages@gmail.com, Andrew Morton <akpm@linux-foundation.org>,
Davidlohr Bueso <davidlohr.bueso@hp.com>,
LKML <linux-kernel@vger.kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Greg Thelen <gthelen@google.com>,
aswin@hp.com, "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] ipc/shm: Increase the defaults for SHMALL, SHMMAX to infinity
Date: Sat, 19 Apr 2014 11:14:59 +0200 [thread overview]
Message-ID: <53523E93.4060702@gmail.com> (raw)
In-Reply-To: <535237AA.7080000@colorfullife.com>
On 04/19/2014 10:45 AM, Manfred Spraul wrote:
> On 04/19/2014 09:10 AM, Michael Kerrisk (man-pages) wrote:
>> On Sat, Apr 19, 2014 at 8:55 AM, Davidlohr Bueso <davidlohr@hp.com> wrote:
>>> On Fri, 2014-04-18 at 11:18 +0200, Manfred Spraul wrote:
>>>> Risks:
>>>> - The patch breaks installations that use "take current value and increase
>>>> it a bit". [seems to exist, http://marc.info/?l=linux-mm&m=139638334330127]
>>> This really scares me. The probability of occurrence is now much higher,
>>> and not just theoretical. It would legitimately break userspace.
>> I'm missing something. Manfred's patch doesn't actually change the
>> behavior on this point does it? If the problem is more than
>> theoretical, then it _already_ affects users, right? (And they would
>> therefore already be working around the problem.)
> The current default is 32 MB. if some increases it by 1 MB, then the
> result is 33 MB.
> The new default would be ULONG_MAX. If someone increases it by 1 MB,
> then the result is 1 MB - 1 byte.
Ahh. Got it now--sorry for being slow.
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2014-04-19 9:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-18 9:18 [PATCH] ipc/shm: Increase the defaults for SHMALL, SHMMAX to infinity Manfred Spraul
2014-04-18 14:54 ` Motohiro Kosaki
2014-04-19 6:55 ` Davidlohr Bueso
2014-04-19 7:10 ` Michael Kerrisk (man-pages)
2014-04-19 8:45 ` Manfred Spraul
2014-04-19 9:14 ` Michael Kerrisk (man-pages) [this message]
2014-04-19 8:37 ` Manfred Spraul
2014-04-19 9:17 ` 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=53523E93.4060702@gmail.com \
--to=mtk.manpages@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=aswin@hp.com \
--cc=davidlohr.bueso@hp.com \
--cc=davidlohr@hp.com \
--cc=gthelen@google.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=manfred@colorfullife.com \
/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).