linux-kernel - Re: [PATCH 1/5] staging: android: lowmemorykiller: Add config option to support oom

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Message-ID: <CAMP5XgcjdZk5MZ9v+W5phgWgE4Q0Pc_2FfopapjctsV6sdguLQ@mail.gmail.com>
Date:	Wed, 27 Feb 2013 14:38:05 -0800
From:	Arve Hjønnevåg <arve@...roid.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	John Stultz <john.stultz@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/5] staging: android: lowmemorykiller: Add config option
 to support oom_adj values

On Wed, Feb 27, 2013 at 2:18 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Tue, 26 Feb 2013, John Stultz wrote:
>
>> From: Arve Hjønnevåg <arve@...roid.com>
>>
>> The conversion to use oom_score_adj instead of the deprecated oom_adj
>> values breaks existing user-space code. Add a config option to convert
>> oom_adj values written to oom_score_adj values if they appear to be
>> valid oom_adj values.
>>
>
> Umm, writes to /proc/pid/oom_adj already are converted to the
> /proc/pid/oom_score_adj scale linearly.  Heavy NACK to this patch since
> oom_adj is completely deprecated.

I know it is deprecated, but your change, staging: android,
lowmemorykiller: convert to use oom_score_adj, broke existing
user-space code that still write to /proc/pid/oom_adj. This option
lets you build a kernel that supports our user-space code until that
user-space has been converted to use /proc/pid/oom_score_adj.

-- 
Arve Hjønnevåg
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