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

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Message-ID: <20091030182428.GB5181@hmsreliant.think-freely.org>
Date:	Fri, 30 Oct 2009 14:24:28 -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
Subject: Re: [PATCH 0/3] extend get/setrlimit to support setting rlimits
	external to a process (v7)

On Wed, Oct 28, 2009 at 10:44:26AM -0400, Neil Horman wrote:
> 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

Ping?
Neil

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