From: David Hildenbrand <david@redhat.com>
To: Yafang Shao <laoar.shao@gmail.com>,
andriy.shevchenko@linux.intel.com, vbabka@suse.cz,
linmiaohe@huawei.com, cl@linux.com, penberg@kernel.org,
rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, pmladek@suse.com, rostedt@goodmis.org,
sergey.senozhatsky@gmail.com, linux@rasmusvillemoes.dk
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Joe Perches <joe@perches.com>
Subject: Re: [PATCH v2 3/3] vsprintf: dump full information of page flags in pGp
Date: Mon, 1 Feb 2021 14:23:33 +0100 [thread overview]
Message-ID: <66784ea1-29c7-6bed-ca7f-cd3e7ea9155b@redhat.com> (raw)
In-Reply-To: <20210201115610.87808-4-laoar.shao@gmail.com>
On 01.02.21 12:56, Yafang Shao wrote:
> Currently the pGp only shows the names of page flags, rather than
> the full information including section, node, zone, last cpupid and
> kasan tag. While it is not easy to parse these information manually
> because there're so many flavors. Let's interpret them in pGp as well.
>
> - Before the patch,
> [ 6343.396602] Slab 0x000000004382e02b objects=33 used=3 fp=0x000000009ae06ffc flags=0x17ffffc0010200(slab|head)
>
> - After the patch,
> [ 6871.296131] Slab 0x00000000c0e19a37 objects=33 used=3 fp=0x00000000c4902159 flags=0x17ffffc0010200(Node 0,Zone 2,Lastcpupid 0x1fffff,slab|head)
For debugging purposes, it might be helpful to have the actual zone name
(and to know if the value is sane). You could obtain it (without other
modifications) via
const char zname = "Invalid";
if (zone < MAX_NR_ZONES)
zname = first_online_pgdat()->node_zones[zone].name;
Similarly, it might also be helpful to indicate if a node is
online/offline/invalid/.
const char nstate = "Invalid";
if (node_online(nid))
nstate = "Online";
else if (node_possible(nid))
nstate = "Offline";
Printing that in addition to the raw value could be helpful. Just some
thoughts.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-02-01 13:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 11:56 [PATCH v2 0/3] mm, vsprintf: dump full information of page flags in pGp Yafang Shao
2021-02-01 11:56 ` [PATCH v2 1/3] mm, slub: use pGp to print page flags Yafang Shao
2021-02-01 11:56 ` [PATCH v2 2/3] mm, slub: don't combine pr_err with INFO Yafang Shao
2021-02-01 11:56 ` [PATCH v2 3/3] vsprintf: dump full information of page flags in pGp Yafang Shao
2021-02-01 13:05 ` Joe Perches
2021-02-01 13:27 ` Yafang Shao
2021-02-01 13:23 ` David Hildenbrand [this message]
2021-02-01 13:32 ` David Hildenbrand
2021-02-01 13:34 ` Andy Shevchenko
2021-02-01 13:52 ` Yafang Shao
2021-02-01 16:03 ` Andy Shevchenko
2021-02-01 13:27 ` Andy Shevchenko
2021-02-01 13:49 ` Yafang Shao
2021-02-01 16:16 ` Andy Shevchenko
2021-02-01 16:20 ` Andy Shevchenko
2021-02-02 13:25 ` Yafang Shao
2021-02-01 14:15 ` Matthew Wilcox
2021-02-01 14:44 ` Yafang Shao
2021-02-01 18:51 ` Joe Perches
2021-02-01 18:59 ` Matthew Wilcox
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