linux-kernel - Re: Does Linux have plan to support memory hole remapping?

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Message-ID: <ac8af0be0804092351g5388f75fr53cd4cf0774e0fd9@mail.gmail.com>
Date:	Thu, 10 Apr 2008 14:51:42 +0800
From:	"Zhao Forrest" <forrest.zhao@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	discuss@...-64.org, linux-kernel@...r.kernel.org,
	yhlu.kernel@...il.com, mingo@...e.hu, ak@...e.de
Subject: Re: Does Linux have plan to support memory hole remapping?

> 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
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