This allows an external program to act as a hotness tracker.
Signed-off-by: Jonathan Cameron <jonathan.came...@huawei.com>
---
contrib/plugins/cache.c | 75 +++++++++++++++++++++++++++++++++++++----
1 file changed, 68 insertions(+), 7 deletions(-)
diff --git a/contrib/plugins/cache.c b/contrib/plugins/cache.c
index 7baff86860..5af1e6559c 100644
--- a/contrib/plugins/cache.c
+++ b/contrib/plugins/cache.c
@@ -7,10 +7,17 @@
#include <inttypes.h>
#include <stdio.h>
+#include <unistd.h>
#include <glib.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
#include <qemu-plugin.h>
+static int client_socket = -1;
+static uint64_t missfilterbase;
+static uint64_t missfiltersize;
+
#define STRTOLL(x) g_ascii_strtoll(x, NULL, 10)
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
@@ -104,6 +111,7 @@ static Cache **l2_ucaches;
static GMutex *l1_dcache_locks;
static GMutex *l1_icache_locks;
static GMutex *l2_ucache_locks;
+static GMutex *socket_lock;
static uint64_t l1_dmem_accesses;
static uint64_t l1_imem_accesses;
@@ -385,6 +393,21 @@ static bool access_cache(Cache *cache, uint64_t addr)
return false;
}
+static void miss(uint64_t paddr)
+{
+ if (client_socket < 0) {
+ return;
+ }
+
+ if (paddr < missfilterbase || paddr >= missfilterbase + missfiltersize) {
+ return;
+ }
+
+ g_mutex_lock(socket_lock);
+ send(client_socket, &paddr, sizeof(paddr), 0);
+ g_mutex_unlock(socket_lock);
+}
+
static void vcpu_mem_access(unsigned int vcpu_index, qemu_plugin_meminfo_t
info,
uint64_t vaddr, void *userdata)
{
@@ -395,9 +418,6 @@ static void vcpu_mem_access(unsigned int vcpu_index,
qemu_plugin_meminfo_t info,
bool hit_in_l1;
hwaddr = qemu_plugin_get_hwaddr(info, vaddr);
- if (hwaddr && qemu_plugin_hwaddr_is_io(hwaddr)) {
- return;
- }
effective_addr = hwaddr ? qemu_plugin_hwaddr_phys_addr(hwaddr) : vaddr;
cache_idx = vcpu_index % cores;
@@ -412,7 +432,11 @@ static void vcpu_mem_access(unsigned int vcpu_index,
qemu_plugin_meminfo_t info,
l1_dcaches[cache_idx]->accesses++;
g_mutex_unlock(&l1_dcache_locks[cache_idx]);
- if (hit_in_l1 || !use_l2) {
+ if (hit_in_l1) {
+ return;
+ }
+ if (!use_l2) {
+ miss(effective_addr);
/* No need to access L2 */
return;
}
@@ -422,6 +446,7 @@ static void vcpu_mem_access(unsigned int vcpu_index,
qemu_plugin_meminfo_t info,
insn = userdata;
__atomic_fetch_add(&insn->l2_misses, 1, __ATOMIC_SEQ_CST);
l2_ucaches[cache_idx]->misses++;
+ miss(effective_addr);
}
l2_ucaches[cache_idx]->accesses++;
g_mutex_unlock(&l2_ucache_locks[cache_idx]);
@@ -447,8 +472,12 @@ static void vcpu_insn_exec(unsigned int vcpu_index, void
*userdata)
l1_icaches[cache_idx]->accesses++;
g_mutex_unlock(&l1_icache_locks[cache_idx]);
- if (hit_in_l1 || !use_l2) {
- /* No need to access L2 */
+ if (hit_in_l1) {
+ return;
+ }
+
+ if (!use_l2) {
+ miss(insn_addr);
return;
}
@@ -739,14 +768,16 @@ QEMU_PLUGIN_EXPORT
int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
int argc, char **argv)
{
- int i;
+ int i, port;
int l1_iassoc, l1_iblksize, l1_icachesize;
int l1_dassoc, l1_dblksize, l1_dcachesize;
int l2_assoc, l2_blksize, l2_cachesize;
+ struct sockaddr_in server_addr;
limit = 32;
sys = info->system_emulation;
+ port = -1;
l1_dassoc = 8;
l1_dblksize = 64;
l1_dcachesize = l1_dblksize * l1_dassoc * 32;
@@ -808,11 +839,39 @@ int qemu_plugin_install(qemu_plugin_id_t id, const
qemu_info_t *info,
fprintf(stderr, "invalid eviction policy: %s\n", opt);
return -1;
}
+ } else if (g_strcmp0(tokens[0], "port") == 0) {
+ port = STRTOLL(tokens[1]);
+ } else if (g_strcmp0(tokens[0], "missfilterbase") == 0) {
+ missfilterbase = STRTOLL(tokens[1]);
+ } else if (g_strcmp0(tokens[0], "missfiltersize") == 0) {
+ missfiltersize = STRTOLL(tokens[1]);
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
+ if (port >= -1) {
+ uint64_t paddr = 42; /* hello, I'm a provider */
+ client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (client_socket < 0) {
+ printf("failed to create a socket\n");
+ return -1;
+ }
+ printf("Cache miss reported on on %lx size %lx\n",
+ missfilterbase, missfiltersize);
+ memset((char *)&server_addr, 0, sizeof(server_addr));
+ server_addr.sin_family = AF_INET;
+ server_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ server_addr.sin_port = htons(port);
+
+ if (connect(client_socket, (struct sockaddr *)&server_addr,
+ sizeof(server_addr)) < 0) {
+ close(client_socket);
+ return -1;
+ }
+ /* Let it know we are a data provider */
+ send(client_socket, &paddr, sizeof(paddr), 0);
+ }
policy_init();
@@ -840,6 +899,8 @@ int qemu_plugin_install(qemu_plugin_id_t id, const
qemu_info_t *info,
return -1;
}
+ socket_lock = g_new0(GMutex, 1);
+
l1_dcache_locks = g_new0(GMutex, cores);
l1_icache_locks = g_new0(GMutex, cores);
l2_ucache_locks = use_l2 ? g_new0(GMutex, cores) : NULL;
--
2.43.0
