linux-kernel - Re: mm: Export 'pageflag

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Message-ID: <529498789.2966198.1381257441670.JavaMail.root@redhat.com>
Date:	Tue, 8 Oct 2013 14:37:21 -0400 (EDT)
From:	Dave Anderson <anderson@...hat.com>
To:	Anatol Pomozov <anatol.pomozov@...il.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, gthelen@...gle.com
Subject: Re: mm: Export 'pageflag_names' array



----- Original Message -----
> 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?

It's a good addition -- I'm working on a patch as we speak...

Thanks,
  Dave

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