linux-kernel - Re: mm: Export 'pageflag

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Message-ID: <CAOMFOmUXxZNCTcoYOu_-aLPWUQ10jNoa3dDb4RUs2DCmGHqfKQ@mail.gmail.com>
Date:	Tue, 8 Oct 2013 11:28:26 -0700
From:	Anatol Pomozov <anatol.pomozov@...il.com>
To:	Dave Anderson <anderson@...hat.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, gthelen@...gle.com
Subject: Re: mm: Export 'pageflag_names' array

Hi

On Tue, Oct 8, 2013 at 5:40 AM, Dave Anderson <anderson@...hat.com> wrote:
>
>
> ----- Original Message -----
>> Hi Anatol,
>>
>> On Mon, Oct 07, 2013 at 10:53:32AM -0700, Anatol Pomozov wrote:
>> > Hi Wu
>> >
>> > I have a request wrt your old commit 718a38211.
>> >
>> > I think it makes sense to export array pageflag_names so kernel dump
>> > debug tools (like 'crash') can use it as well. Currently the tool
>> > hard-codes flag names but it is suboptimal as flags are different for
>> > different configs.
>> >
>> > What do you think? (I can send a patch if you are ok).
>>
>> I wonder if the KPF_* defined in
>>
>>         include/uapi/linux/kernel-page-flags.h
>>
>> fit your needs. These are kernel page flags exported to the user space
>> and will be maintained stable and immune to kconfig changes. You can
>> find use examples of them in
>>
>>         fs/proc/page.c
>>         tools/vm/page-types.c
>>
>> Thanks,
>> Fengguang
>>
>
> Nothing is required for the crash utility.  The pageflag_names array (as well
> as the pageflags enumerator) are readily available in the kernel debuginfo
> data.

D'oh. You are right Dave. Everyone, please ignore my original question
I mislooked this variable in symbols map (or maybe looked at an old
kernel map).

Dave, do you think 'crash' should use pageflag_names to output flag names?
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