linux-kernel - Re: [PATCH v2 3/3] vsprintf: dump full information of page flags in pGp

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Message-ID: <YBgqP78VEoE9G8Yf@smile.fi.intel.com>
Date:   Mon, 1 Feb 2021 18:20:15 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Christoph Lameter <cl@...ux.com>, penberg@...nel.org,
        David Rientjes <rientjes@...gle.com>, iamjoonsoo.kim@....com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v2 3/3] vsprintf: dump full information of page flags in
 pGp

On Mon, Feb 01, 2021 at 06:16:42PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 01, 2021 at 09:49:59PM +0800, Yafang Shao wrote:
> > On Mon, Feb 1, 2021 at 9:27 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > > On Mon, Feb 01, 2021 at 07:56:10PM +0800, Yafang Shao wrote:

...

> > The existing one should be more important than the added one.
> > But the order of output will not match with the value for page->flags.
> > E.g.
> >     flags=0x17ffffc0010200(slab|head,Node 0,Zone 2,Lastcpupid 0x1fffff)
> > It may be strange to compare the value with the string.
> 
> More I'm looking at it, more I'm thinking it should have different specifiers
> for each group of desired flags to be printed.
> 
> So, you leave %pGp as is and then add another letter to add more details, so
> user will choose what and in which order they want.
> 
> For example, let's assume %pGp == %pGpf and P is a new specifier for what you
> are initially adding here:
> 
>   %pGpfP => referenced|uptodate|lru|active|private,Node 0,Zone 2
>   %pGpPf => Node 0,Zone 2,referenced|uptodate|lru|active|private
> 
> and so on.

And I agree with Matthew about format, but it doesn't oppose my suggestion
above.

-- 
With Best Regards,
Andy Shevchenko