linux-kernel - Re: [PATCH] mm/memory-failure.c: define page types for action

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Message-ID: <alpine.DEB.2.10.1503242058300.20696@chino.kir.corp.google.com>
Date:	Tue, 24 Mar 2015 21:02:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>,
	Xie XiuQi <xiexiuqi@...wei.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chen Gong <gong.chen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] mm/memory-failure.c: define page types for action_result()
 in one place

On Thu, 19 Mar 2015, Naoya Horiguchi wrote:

> This cleanup patch moves all strings passed to action_result() into a single
> array action_page_type so that a reader can easily find which kind of action
> results are possible. And this patch also fixes the odd lines to be printed
> out, like "unknown page state page" or "free buddy, 2nd try page".
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  mm/memory-failure.c | 107 +++++++++++++++++++++++++++++++++++++---------------
>  1 file changed, 76 insertions(+), 31 deletions(-)
> 
> diff --git v3.19.orig/mm/memory-failure.c v3.19/mm/memory-failure.c
> index d487f8dc6d39..afb740e1c8b0 100644
> --- v3.19.orig/mm/memory-failure.c
> +++ v3.19/mm/memory-failure.c
> @@ -521,6 +521,52 @@ static const char *action_name[] = {
>  	[RECOVERED] = "Recovered",
>  };
>  
> +enum page_type {
> +	KERNEL,
> +	KERNEL_HIGH_ORDER,
> +	SLAB,
> +	DIFFERENT_COMPOUND,
> +	POISONED_HUGE,
> +	HUGE,
> +	FREE_HUGE,
> +	UNMAP_FAILED,
> +	DIRTY_SWAPCACHE,
> +	CLEAN_SWAPCACHE,
> +	DIRTY_MLOCKED_LRU,
> +	CLEAN_MLOCKED_LRU,
> +	DIRTY_UNEVICTABLE_LRU,
> +	CLEAN_UNEVICTABLE_LRU,
> +	DIRTY_LRU,
> +	CLEAN_LRU,
> +	TRUNCATED_LRU,
> +	BUDDY,
> +	BUDDY_2ND,
> +	UNKNOWN,
> +};
> +

I like the patch because of the consistency in output and think it's worth 
the extra 1% .text size.

My only concern is the generic naming of the enum members.  
memory-failure.c is already an offender with "enum outcome" and the naming 
of its members.

Would you mind renaming these to be prefixed with "MSG_"?

These enums should be anonymous, too, nothing is referencing enum outcome 
or your new enum page_type.
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