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Date: Thu, 10 Apr 2008 14:51:42 +0800
From: "Zhao Forrest" <forrest.zhao@gmail.com>
To: "Andi Kleen" <andi@firstfloor.org>
Subject: Re: Does Linux have plan to support memory hole remapping?
Cc: discuss@x86-64.org, linux-kernel@vger.kernel.org, yhlu.kernel@gmail.com,
       mingo@elte.hu, ak@suse.de
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> There is some loss of memory before MemTotal, both from the BIOS
> (SMM, Frame Buffer for integrated graphics etc.) and from the kernel
> (mem_map which costs a few percent and some other data structures
> which are allocated early)
>
> I covered this in detail in http://halobates.de/memorywaste.pdf
>

I read your paper, which is very helpful for us to understand the
memory usage in Linux kernel.
And I have a question about output of slabtop:
 Active / Total Objects (% used)    : 730986 / 750823 (97.4%)
 Active / Total Slabs (% used)      : 46124 / 46125 (100.0%)
 Active / Total Caches (% used)     : 99 / 149 (66.4%)
 Active / Total Size (% used)       : 169383.63K / 172467.11K (98.2%)

Could you please elaborate on Active / Total Caches? The meaning of
other lines are obvious to me.

Thanks,
Forrest