As described in COD Section 5.7 (Virtual memory), virtual memory uses a page table to track the mapping of virtual addresses to physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitute a stream of virtual byte addresses as seen on a system. Assume 4 KiB pages, a four-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. Decimal 4669 hex TLB Page Table 2227 13916 34587 48870 12608 49225 0x123d 0x08b3 0x365c 0x871b Oxbee6 0x3140 0xc049 Valid 1 1 1 0 Index 0 (a) For each access shown above, list 123 4 5 6 7 8 9 a b Tag Oxb Ox7 0x3 0x4 Valid 1 0 0 1 1 1 0 1 0 0 1 1 ▪ whether the access is a hit or miss in the TLB, ▪ whether the access is a hit or miss in the page table, ▪ whether the access is a page fault, ▪ the updated state of the TLB. Physical Page Number 12 4 6 9 Time Since Last Access 4 1 3 7 Physical Page or in Disk 5 Disk Disk 6 9 11 Disk 4 Disk Disk 3 12 (b) Repeat Part a, but this time use 16 KiB pages instead of 4 KiB pages. What would be some of the advantages of having a larger page size? What are some of the disadvantages?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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As described in COD Section 5.7 (Virtual memory), virtual memory uses a page table to track the mapping of virtual addresses to
physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitute a
stream of virtual byte addresses as seen on a system. Assume 4 KiB pages, a four-entry fully associative TLB, and true LRU
replacement. If pages must be brought in from disk, increment the next largest page number.
TLB
Page Table
Decimal 4669 2227 13916 34587 48870 12608 49225
hex 0x123d 0x08b3 0x365c 0x871b 0xbee6 0x3140 0xc049
Valid
1
1
1
0
Index
0
1
2
3
(a) For each access shown above, list
456
7
8
9
a
b
Tag
Oxb
0x7
0x3
0x4
Valid
1
0
0
1
1
1
0
1
0
0
1
1
▪ whether the access is a hit or miss in the TLB,
▪ whether the access is a hit or miss in the page table,
whether the access is a page fault,
the updated state of the TLB.
Physical Page
Number
12
4
6
9
Time Since Last
Access
4
1
3
7
Physical Page or in Disk
5
Disk
Disk
6
9
11
Disk
4
Disk
Disk
3
12
(b) Repeat Part a, but this time use 16 KiB pages instead of 4 KiB pages. What would be some of the advantages of having a larger
page size? What are some of the disadvantages?
Transcribed Image Text:As described in COD Section 5.7 (Virtual memory), virtual memory uses a page table to track the mapping of virtual addresses to physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitute a stream of virtual byte addresses as seen on a system. Assume 4 KiB pages, a four-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. TLB Page Table Decimal 4669 2227 13916 34587 48870 12608 49225 hex 0x123d 0x08b3 0x365c 0x871b 0xbee6 0x3140 0xc049 Valid 1 1 1 0 Index 0 1 2 3 (a) For each access shown above, list 456 7 8 9 a b Tag Oxb 0x7 0x3 0x4 Valid 1 0 0 1 1 1 0 1 0 0 1 1 ▪ whether the access is a hit or miss in the TLB, ▪ whether the access is a hit or miss in the page table, whether the access is a page fault, the updated state of the TLB. Physical Page Number 12 4 6 9 Time Since Last Access 4 1 3 7 Physical Page or in Disk 5 Disk Disk 6 9 11 Disk 4 Disk Disk 3 12 (b) Repeat Part a, but this time use 16 KiB pages instead of 4 KiB pages. What would be some of the advantages of having a larger page size? What are some of the disadvantages?
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