tests/gem5/replacement-policies/traces/second_chance_test2_ld.py

# Copyright (c) 2022 Jarvis Jia, Jing Qu, Matt Sinclair, & Mingyuan Xiang
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# This test is targeting loads.
# access pattern: A, C, E, G, A, C, E, G, I, A, C, E, G
# Each letter represents a 64-byte address range.

# The [] indicate two different sets, and each set has four ways.
# [set0way0, set0way1, set0way2, set0way3],
# [set1way0, set1way1, set1way2, set1way3],
# If you have a 512B cache with 4-way associativity,
# and each cache line is 64B. This test can be used to test the correctness of Second Chance
# replacement policy. The Second Chance replacement policy will keep the block
# 'A' and 'C' in the cache because of the second chance bit. More specifically,
# with Second Chance replacement policy, you will observe:
# m, m, m, m, h, h, h, h, m, m, m, m, m where 'm' means miss, and 'h' means hit.

# Explanation of the result:
# A, C, E, G are misses. The cache stores ([A0, C0, E0, G0],[ , , ,]).
# The number after each letter is the second chance bit, which would be set after a re-reference.
# A, C, E, G are hit. Now the cache stores ([A1, C1, E1, G1],[ , , ,]).
# I searches a victim and selects A. Now the cache stores ([I0, C0, E0, G0],[ , , ,]).
# A searches a victim and selects C. Now the cache stores ([I0, A0, E0, G0],[ , , ,]).
# C searches a victim and selects E. Now the cache stores ([I0, A0, C0, G0],[ , , ,]).
# E searches a victim and selects G. Now the cache stores ([I0, A0, C0, E0],[ , , ,]).
# G searches a victim and selects I. Now the cache stores ([G0, A0, C0, E0],[ , , ,]).

from m5.objects.ReplacementPolicies import SecondChanceRP as rp


def python_generator(generator):

    yield generator.createLinear(60000, 0, 63, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 128, 191, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 256, 319, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 384, 447, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 0, 63, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 128, 191, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 256, 319, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 384, 447, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 512, 575, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 0, 63, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 128, 191, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 256, 319, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(60000, 384, 447, 64, 30000, 30000, 100, 0)
    yield generator.createLinear(30000, 0, 0, 0, 30000, 30000, 100, 0)

    yield generator.createExit(0)