אני משער שלא יימצא מבחן פתור בו תשובה לשאלה זו אכן תהיה נכונה (ואל תתנו
לניקוד גבוה בה להטעות אתכם), אז הרי היא לפניכם:
בהצלחה לכולם,
עידו.
Solution:
For first load:
PDE read, PDE write for A bit, PTE read,
user read
1 user read, 2 system read,
1 system write
1st iteration of the loop:
PDE read, PTE read, PTE write D bit, user
write
1 user read, 2 system read,
1 system write
0x21 iterations => 0x20 = 32 times for next iterations:
PDE read, PDE write for A bit, PTE read, PTE
write for D-bit, user write - every iteration
User write clears the D bit in PTE and A bit
in PDE
1 user write, 2 system read,
2 system write
Last read:
PDE read, PTE read, user read
1 user read, 1 system write
A bit, 2 system read
User reads: 2
Sys reads: 70 total reads 72
Sys writes: 67
User writes: 33 total writes 100
PDE/PTE are the same entry J
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