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

From: David Rientjes
Date: Sun Nov 01 2015 - 00:30:58 EST

On Wed, 28 Oct 2015, Eric W. Biederman wrote:

> > 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.


We've tried to remove it over the period of a couple of years after
oom_score_adj was introduced. I believe we had a WARN_ON() for the first
two years and then removed it all together. A few months later, there was
a bug report because the file didn't exist and Linus insisted it be
readded because we don't break userspace.

I would absolutely love to remove oom_adj, but I'm afraid that it may not
be possible.
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