From: Andrew Morton <akpm@linux-foundation.org>
To: Jiang Liu <liuj97@gmail.com>
Cc: David Rientjes <rientjes@google.com>,
sworddragon2@aol.com, Jiang Liu <jiang.liu@huawei.com>,
bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2] mm: let /proc/meminfo report physical memory installed as "MemTotal"
Date: Wed, 20 Feb 2013 14:49:17 -0800 [thread overview]
Message-ID: <20130220144917.7d289ef0.akpm@linux-foundation.org> (raw)
In-Reply-To: <1361381245-14664-1-git-send-email-jiang.liu@huawei.com>
On Thu, 21 Feb 2013 01:27:25 +0800
Jiang Liu <liuj97@gmail.com> wrote:
> As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501,
> "MemTotal" from /proc/meminfo means memory pages managed by the buddy
> system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo
> means phsical pages present (present_pages) within the NUMA node.
> There's a difference between managed_pages and present_pages due to
> bootmem allocator and reserved pages.
>
> So change /proc/meminfo to report physical memory installed as
> "MemTotal", which is
> MemTotal = sum(pgdat->present_pages)
Documentation/filesystems/proc.txt says
MemTotal: Total usable ram (i.e. physical ram minus a few reserved
bits and the kernel binary code)
And arguably, that is more useful than "total physical memory".
Presumably the per-node MemTotals are including kernel memory and
reserved memory. Maybe they should be fixed instead (sounds hard).
Or maybe we just leave everything as-is and document it carefully.
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next prev parent reply other threads:[~2013-02-20 22:49 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-53501-27@https.bugzilla.kernel.org/>
2013-02-13 0:51 ` [Bug 53501] New: Duplicated MemTotal with different values Andrew Morton
2013-02-13 1:45 ` David Rientjes
2013-02-13 3:59 ` Andrew Morton
2013-02-14 3:19 ` David Rientjes
2013-02-14 4:01 ` Jiang Liu
2013-02-15 0:26 ` David Rientjes
2013-02-20 5:21 ` Simon Jeons
2013-02-20 7:09 ` David Rientjes
2013-03-02 2:21 ` Simon Jeons
2013-03-04 11:18 ` David Rientjes
2013-03-04 23:39 ` Simon Jeons
2013-03-05 21:53 ` David Rientjes
2013-02-16 16:27 ` [PATCH 1/2] vm: add 'MemManaged' field to /proc/meminfo and /sys/.../nodex/meminfo Jiang Liu
2013-02-19 21:29 ` David Rientjes
2013-02-20 17:27 ` [PATCH v2] mm: let /proc/meminfo report physical memory installed as "MemTotal" Jiang Liu
2013-02-20 22:49 ` Andrew Morton [this message]
2013-02-21 17:26 ` Jiang Liu
2013-02-21 21:31 ` Andrew Morton
2013-02-22 19:22 ` Jiang Liu
2013-02-16 16:27 ` [PATCH 2/2] mm: protect si_meminfo() and si_meminfo_node() from memory hotplug operations Jiang Liu
2013-02-19 21:32 ` David Rientjes
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