Re: 答复: [PATCHv2 4.3-rc6] proc: fix convert from oom_score_adj to oom_adj

[ebiederm@xmission.com (Eric W. Biederman)]

David Rientjes <rientjes@google.com> writes:

> On Wed, 28 Oct 2015, Hongjie Fang (方洪杰) wrote:
>
>> Under a userspace perspective, get a different value than he wrote, 
>> it must be confusing.
>> 
>
> It's confusing, but with purpose: it shows there is no direct mapping 
> between /proc/pid/oom_adj and /proc/pid/oom_score_adj.  
> /proc/pid/oom_score_adj is the effective policy and has been for years.  
> The value returned by /proc/pid/oom_adj demonstrates reality vs what is 
> perceived and is a side-effect of integer division truncating the result 
> in C.
>
> It's a bad situation, I agree, and we anticipated the complete removal of 
> /proc/pid/oom_adj years ago since it has been deprecated for years.  Maybe 
> one day we can convince Linus that is possible, but until then we're stuck 
> with it.

If you really want to remove /proc/pid/oom_adj start by placing it in a
Kconfig so people can make it go away.

Eric