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Date: Sat, 29 May 2021 17:22:03 +0200 Message-Id: <20210529152203.40358-4-ma.mandourr@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210529152203.40358-1-ma.mandourr@gmail.com> References: <20210529152203.40358-1-ma.mandourr@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=ma.mandourr@gmail.com; helo=mail-wr1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mahmoud Mandour , =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Now one of the three eviction policies can be chosen as an argument. On not specifying an argument, LRU is used by default. Signed-off-by: Mahmoud Mandour --- contrib/plugins/cache.c | 159 ++++++++++++++++++++++++++++++++++++---- 1 file changed, 146 insertions(+), 13 deletions(-) diff --git a/contrib/plugins/cache.c b/contrib/plugins/cache.c index 7d1d185480..341cd64e41 100644 --- a/contrib/plugins/cache.c +++ b/contrib/plugins/cache.c @@ -18,6 +18,8 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; +static bool fifo, lru, rnd; + static GRand *rng; static GHashTable *dmiss_ht; static GHashTable *imiss_ht; @@ -55,6 +57,8 @@ struct CacheBlock { struct CacheSet { struct CacheBlock *blocks; + uint16_t *priorities; + GQueue *evict_queue; }; struct Cache { @@ -93,6 +97,84 @@ static inline uint64_t extract_set(struct Cache *cache, uint64_t addr) return (addr & cache->set_mask) >> (pow_of_two(cache->blksize)); } +static void lru_priorities_init(struct Cache *cache) +{ + int i, j; + + for (i = 0; i < cache->num_sets; i++) { + cache->sets[i].priorities = g_new(uint16_t, cache->assoc); + for (j = 0; j < cache->assoc; j++) { + cache->sets[i].priorities[j] = cache->assoc - j - 1; + } + } +} + +static void lru_update_on_miss(struct Cache *cache, + int set_idx, + int blk_idx) +{ + int i; + + for (i = 0; i < cache->assoc; i++) { + cache->sets[set_idx].priorities[i]++; + } + + cache->sets[set_idx].priorities[blk_idx] = 0; +} + +static void lru_update_on_hit(struct Cache *cache, + int set_idx, + int blk_idx) +{ + uint16_t blk_priority; + int i; + + blk_priority = cache->sets[set_idx].priorities[blk_idx]; + for (i = 0; i < cache->assoc; i++) { + if (cache->sets[set_idx].priorities[i] < blk_priority) { + cache->sets[set_idx].priorities[i]++; + } + } + cache->sets[set_idx].priorities[blk_idx] = 0; +} + +static int lru_get_lru_block(struct Cache *cache, int set_idx) +{ + int i; + + for (i = 0; i < cache->assoc; i++) { + if (cache->sets[set_idx].priorities[i] == cache->assoc - 1) { + return i; + } + } + + g_assert_not_reached(); +} + +static void fifo_init(struct Cache *cache) +{ + int i; + + for (i = 0; i < cache->num_sets; i++) { + cache->sets[i].evict_queue = g_queue_new(); + } +} + +static int fifo_get_first_in_block(struct Cache *cache, int set) +{ + GQueue *q = cache->sets[set].evict_queue; + return GPOINTER_TO_INT(g_queue_pop_tail(q)); +} + +static void fifo_update_on_miss(struct Cache *cache, + int set, + int blk_idx) +{ + GQueue *q = cache->sets[set].evict_queue; + g_queue_push_head(q, GINT_TO_POINTER(blk_idx)); +} + + static struct Cache *cache_init(int blksize, int assoc, int cachesize) { struct Cache *cache; @@ -113,6 +195,12 @@ static struct Cache *cache_init(int blksize, int assoc, int cachesize) cache->set_mask = ((cache->num_sets - 1) << (pow_of_two(cache->blksize))); cache->tag_mask = ~(cache->set_mask | cache->blk_mask); + if (lru) { + lru_priorities_init(cache); + } else if (fifo) { + fifo_init(cache); + } + return cache; } @@ -131,12 +219,20 @@ static int get_invalid_block(struct Cache *cache, uint64_t set) return -1; } -static int get_replaced_block(struct Cache *cache) +static int get_replaced_block(struct Cache *cache, int set) { - return g_rand_int_range(rng, 0, cache->assoc); + if (rnd) { + return g_rand_int_range(rng, 0, cache->assoc); + } else if (lru) { + return lru_get_lru_block(cache, set); + } else if (fifo) { + return fifo_get_first_in_block(cache, set); + } + + g_assert_not_reached(); } -static bool in_cache(struct Cache *cache, uint64_t addr) +static int in_cache(struct Cache *cache, uint64_t addr) { int i; uint64_t tag, set; @@ -147,29 +243,39 @@ static bool in_cache(struct Cache *cache, uint64_t addr) for (i = 0; i < cache->assoc; i++) { if (cache->sets[set].blocks[i].tag == tag && cache->sets[set].blocks[i].valid) { - return true; + return i; } } - return false; + return -1; } static enum AccessResult access_cache(struct Cache *cache, uint64_t addr) { uint64_t tag, set; - int replaced_blk; - - if (in_cache(cache, addr)) { - return HIT; - } + int hit_blk, replaced_blk; tag = extract_tag(cache, addr); set = extract_set(cache, addr); + hit_blk = in_cache(cache, addr); + + if (hit_blk != -1) { + if (lru) { + lru_update_on_hit(cache, set, hit_blk); + } + return HIT; + } replaced_blk = get_invalid_block(cache, set); if (replaced_blk == -1) { - replaced_blk = get_replaced_block(cache); + replaced_blk = get_replaced_block(cache, set); + } + + if (lru) { + lru_update_on_miss(cache, set, replaced_blk); + } else if (fifo) { + fifo_update_on_miss(cache, set, replaced_blk); } cache->sets[set].blocks[replaced_blk].tag = tag; @@ -307,6 +413,11 @@ static void free_cache(struct Cache *cache) { for (int i = 0; i < cache->num_sets; i++) { g_free(cache->sets[i].blocks); + if (lru) { + g_free(cache->sets[i].priorities); + } else if (fifo) { + g_queue_free(cache->sets[i].evict_queue); + } } g_free(cache->sets); @@ -403,8 +514,6 @@ int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, iblksize = 64; icachesize = iblksize * iassoc * 32; - rng = g_rand_new(); - for (i = 0; i < argc; i++) { char *opt = argv[i]; if (g_str_has_prefix(opt, "I=")) { @@ -433,6 +542,22 @@ int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, if (!tracefile) { fprintf(stderr, "could not open: %s for writing\n", file_name); } + } else if (g_str_has_prefix(opt, "evict=")) { + if (lru || rnd || fifo) { + fprintf(stderr, "eviction policy specified more than once\n"); + return -1; + } + gchar *policy = opt + 6; + if (g_strcmp0(policy, "rand") == 0) { + rnd = true; + } else if (g_strcmp0(policy, "lru") == 0) { + lru = true; + } else if (g_strcmp0(policy, "fifo") == 0) { + fifo = true; + } else { + fprintf(stderr, "invalid eviction policy: %s\n", opt); + return -1; + } } else { fprintf(stderr, "option parsing failed: %s\n", opt); return -1; @@ -449,6 +574,14 @@ int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, return -1; } + if (!rnd && !lru && !fifo) { + lru = true; + } + + if (rnd) { + rng = g_rand_new(); + } + dcache = cache_init(dblksize, dassoc, dcachesize); icache = cache_init(iblksize, iassoc, icachesize); -- 2.25.1