linux-kernel - Re: [PATCH v2 9/9] mm, oom: print symbolic gfp

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Message-ID: <alpine.DEB.2.10.1601071327490.20990@chino.kir.corp.google.com>
Date:	Thu, 7 Jan 2016 13:29:11 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Minchan Kim <minchan@...nel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v2 9/9] mm, oom: print symbolic gfp_flags in oom
 warning

On Tue, 24 Nov 2015, Vlastimil Babka wrote:

> It would be useful to translate gfp_flags into string representation when
> printing in case of an OOM, especially as the flags have been undergoing some
> changes recently and the script ./scripts/gfp-translate needs a matching source
> version to be accurate.
> 
> Example output:
> 
> a.out invoked oom-killer: order=0, oom_score_adj=0, gfp_mask=0x24280ca(GFP_HIGHUSER_MOVABLE|GFP_ZERO)
> 

Is there a way that we can keep the order of the fields so that anything 
parsing the kernel log for oom kills doesn't break?  The messages printed 
to the kernel log are the only (current) way to determine that the kernel 
killed something so we should be careful not to break anything parsing 
them, and this is a common line to look for.