linux-kernel - Re: [PATCH 0/3] extend get/setrlimit to support setting rlimits external to a process (v7)

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Message-ID: <20091028144426.GA7422@hmsreliant.think-freely.org>
Date:	Wed, 28 Oct 2009 10:44:26 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, marcin.slusarz@...il.com,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	nhorman@...driver.com
Subject: Re: [PATCH 0/3] extend get/setrlimit to support setting rlimits
	external to a process (v7)

On Mon, Oct 19, 2009 at 08:52:15PM -0400, Neil Horman wrote:
> Ok, I give.  I was hoping that some of the requestors of this feature would pipe
> up and support the use case for the proc file interface to set limits.  clearly
> they're not that interested, but I still think theres merit in the patch.  So
> heres version 7 of this patch set.  Its the same as before, but the proc
> interface has been dropped, leaving only the syscall interface behind.  I've
> tested the interface on intel 32 and 64 bit, with success
> 
> Summary:
> 
> Its been requested often that we have the ability to read and modify process
> rlimit values from contexts external to the owning process.  Ideally this allows
> sysadmins to adjust rlimits on long running processes wihout the need to stop
> and restart those processes, which incurs undesireable downtime.  This patch
> enables that functionality,  It does so in two places.  First it enables process
> limit setting by writing to the /proc/pid/limits file a string in the format:
> <limit> <current limit> <max limit> > /proc/<pid>/limits
> where limit is one of
> [as,core,cpu,data,fsize,locks,memlock,msgqueue,nice,nofile,nproc,rss,rtprio,rttime]
> 
> Secondly it allows for programatic setting of these limits via 2 new syscalls,
> getprlimit, and setprlimit, which act in an identical fashion to getrlimit and
> setrlimit respectively, except that they except a process id as an extra
> argument, to specify the process id of the rlimit values that you wish to
> read/write
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
>  
>  
>  
>  
> 

Ping?  Any thoughts
Regards
Neil

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