linux-kernel - Basics : Memory Configuration

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Message-ID: <SG2PR02MB3098925678D8D40B683E10E2E82D0@SG2PR02MB3098.apcprd02.prod.outlook.com>
Date:   Tue, 9 Apr 2019 06:55:34 +0000
From:   Pankaj Suryawanshi <pankaj.suryawanshi@...fochips.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Basics : Memory Configuration

Hello,

I am confuse about memory configuration and I have below questions

1. if 32-bit os maximum virtual address is 4GB, When i have 4 gb of ram for 32-bit os, What about the virtual memory size ? is it required virtual memory(disk space) or we can directly use physical memory ?

2. In 32-bit os 12 bits are offset because page size=4k i.e 2^12 and 2^20 for page addresses
   What about 64-bit os, What is offset size ? What is page size ? How it calculated.

3. What is PAE? If enabled how to decide size of PAE, what is maximum and minimum size of extended memory.

Regards,
Pankaj
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