linux-kernel - Re: Resource limits interface proposal [was: pull request for writable limits]

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Date:	Thu, 6 May 2010 09:39:28 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: Resource limits interface proposal [was: pull request for 
	writable limits]

On Wed, May 5, 2010 at 6:08 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>> It may also be that rlimit64 will contain flags like:
>> #define RLIM64_CUR_INFINITY     0x00000001
>> #define RLIM64_MAX_INFINITY     0x00000002
>> struct rlimit64 {
>>         __u64 rlim_cur;
>>         __u64 rlim_max;
>>         __u32 flags;
>> };
>> if I understood Alexey correctly to separate limits values from
>> infinity? flags then will be converted to ~0ul when converting from
>> rlimit64 to rlimit above too.
>
> Ok, I'm not entirely sure we need to care specially about INFINITY,
> _especially_ since INF is really rather big in 64 bits. So to some degree,
> making things 64-bit is _less_ likely to make INFINITIES a problem.

I'm _sure_, someone will mention bloat and performance degradation
on 32-bit, so there will be config option for 32-bit in-kernel limits.
And if there will be config option, infinities are better be separated.
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