linux-kernel - Re: [PATCH 0/4] ipc/shm.c: increase the limits for SHMMAX, SHMALL

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Message-ID: <1399409007.13799.24.camel@buesod1.americas.hpqcorp.net>
Date:	Tue, 06 May 2014 13:43:27 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	mtk.manpages@...il.com
Cc:	Manfred Spraul <manfred@...orfullife.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>, aswin@...com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/4] ipc/shm.c: increase the limits for SHMMAX, SHMALL

On Tue, 2014-05-06 at 13:06 -0700, Davidlohr Bueso wrote:
> On Fri, 2014-05-02 at 15:16 +0200, Michael Kerrisk (man-pages) wrote:
> > Hi Manfred,
> > 
> > On Mon, Apr 21, 2014 at 4:26 PM, Manfred Spraul
> > <manfred@...orfullife.com> wrote:
> > > Hi all,
> > >
> > > the increase of SHMMAX/SHMALL is now a 4 patch series.
> > > I don't have ideas how to improve it further.
> > 
> > On the assumption that your patches are heading to mainline, could you
> > send me a man-pages patch for the changes?
> 
> Btw, I think that the code could still use some love wrt documentation.
> Andrew, please consider this for -next if folks agree. Thanks.
> 
> 8<----------------------------------------------------------
> 
> From: Davidlohr Bueso <davidlohr@...com>
> Subject: [PATCH] ipc,shm: document new limits in the uapi header
> 
> This is useful in the future and allows users to
> better understand the reasoning behind the changes.
> 
> Also use UL as we're dealing with it anyways.
> 
> Signed-off-by: Davidlohr Bueso <davidlohr@...com>
> ---
>  include/uapi/linux/shm.h | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/include/uapi/linux/shm.h b/include/uapi/linux/shm.h
> index 74e786d..e37fb08 100644
> --- a/include/uapi/linux/shm.h
> +++ b/include/uapi/linux/shm.h
> @@ -8,17 +8,19 @@
>  #endif
>  
>  /*
> - * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
> - * be modified by sysctl.
> + * SHMMNI, SHMMAX and SHMALL are the default upper limits which can be
> + * modified by sysctl. Both SHMMAX and SHMALL have their default values
> + * to the maximum limit which is as large as it can be without helping
> + * userspace overflow the values. There is really nothing the kernel
> + * can do to avoid this any variables. It is therefore not advised to
                              ^^^^^^^^^^ should be 'further', sorry.

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