From: Hugh Dickins <hughd@google.com>
To: Jamie Gloudon <jamie.gloudon@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: x86_64: wrong DirectMap kB
Date: Mon, 1 Oct 2012 08:23:38 -0700 (PDT) [thread overview]
Message-ID: <alpine.LSU.2.00.1210010812530.1914@eggly.anvils> (raw)
In-Reply-To: <20121001104652.GA1390@darkstar>
On Mon, 1 Oct 2012, Jamie Gloudon wrote:
>
> Interesting. I am able to reproduce the same problem as you using mem=700M, which shows:
>
> DirectMap4k: 4096 kB
> DirectMap2M: 18446744073709547520 kB
>
> However, it appears to be normal without the boot parameter:
>
> DirectMap4k: 4096 kB
> DirectMap2M: 15708160 kB
It appears to be normal because the calculations haven't wrapped around,
but if you compare with 3.4 or before, I think you'll find that it
still adds up to too little.
>
> What does your output looks like with the full amount on 3.6?
On 3.6:
MemTotal: 8060528 kB
...
DirectMap4k: 2048 kB
DirectMap2M: 7229440 kB
So it's showing significantly less direct mapped than is included
in MemTotal (which itself omits some areas of reserved memory).
Whereas on 3.4:
MemTotal: 8060760 kB
...
DirectMap4k: 4096 kB
DirectMap2M: 8275968 kB
Hugh
next prev parent reply other threads:[~2012-10-01 15:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-01 10:46 Jamie Gloudon
2012-10-01 15:23 ` Hugh Dickins [this message]
2012-10-01 15:43 ` Jamie Gloudon
-- strict thread matches above, loose matches on Subject: below --
2012-10-01 8:37 Hugh Dickins
2012-10-02 14:19 ` Jan Beulich
2012-10-02 18:16 ` Hugh Dickins
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