linux-kernel - Re: 答复: [PATCHv2 4.3-rc6] proc: fix convert from oom_score_adj to oom

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Date:	Wed, 28 Oct 2015 16:54:04 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Hongjie Fang (方洪杰) 
	<Hongjie.Fang@...eadtrum.com>
cc:	Michal Hocko <mhocko@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 答复: [PATCHv2 4.3-rc6] proc: fix convert from oom_score_adj to oom_adj

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.