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/*
* Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
*
* Hot Pages - show which pages saw the most memory accesses.
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
static uint64_t page_size = 4096;
static uint64_t page_mask;
static int limit = 50;
static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
static bool track_io;
enum sort_type {
SORT_RW = 0,
SORT_R,
SORT_W,
SORT_A
};
static int sort_by = SORT_RW;
typedef struct {
uint64_t page_address;
int cpu_read;
int cpu_write;
uint64_t reads;
uint64_t writes;
} PageCounters;
static GMutex lock;
static GHashTable *pages;
static gint cmp_access_count(gconstpointer a, gconstpointer b)
{
PageCounters *ea = (PageCounters *) a;
PageCounters *eb = (PageCounters *) b;
int r;
switch (sort_by) {
case SORT_RW:
r = (ea->reads + ea->writes) > (eb->reads + eb->writes) ? -1 : 1;
break;
case SORT_R:
r = ea->reads > eb->reads ? -1 : 1;
break;
case SORT_W:
r = ea->writes > eb->writes ? -1 : 1;
break;
case SORT_A:
r = ea->page_address > eb->page_address ? -1 : 1;
break;
default:
g_assert_not_reached();
}
return r;
}
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autoptr(GString) report = g_string_new("Addr, RCPUs, Reads, WCPUs, Writes\n");
int i;
GList *counts;
counts = g_hash_table_get_values(pages);
if (counts && g_list_next(counts)) {
GList *it;
it = g_list_sort(counts, cmp_access_count);
for (i = 0; i < limit && it->next; i++, it = it->next) {
PageCounters *rec = (PageCounters *) it->data;
g_string_append_printf(report,
"0x%016"PRIx64", 0x%04x, %"PRId64
", 0x%04x, %"PRId64"\n",
rec->page_address,
rec->cpu_read, rec->reads,
rec->cpu_write, rec->writes);
}
g_list_free(it);
}
qemu_plugin_outs(report->str);
}
static void plugin_init(void)
{
page_mask = (page_size - 1);
pages = g_hash_table_new(NULL, g_direct_equal);
}
static void vcpu_haddr(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
uint64_t vaddr, void *udata)
{
struct qemu_plugin_hwaddr *hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
uint64_t page;
PageCounters *count;
/* We only get a hwaddr for system emulation */
if (track_io) {
if (hwaddr && qemu_plugin_hwaddr_is_io(hwaddr)) {
page = vaddr;
} else {
return;
}
} else {
if (hwaddr && !qemu_plugin_hwaddr_is_io(hwaddr)) {
page = (uint64_t) qemu_plugin_hwaddr_device_offset(hwaddr);
} else {
page = vaddr;
}
}
page &= ~page_mask;
g_mutex_lock(&lock);
count = (PageCounters *) g_hash_table_lookup(pages, GUINT_TO_POINTER(page));
if (!count) {
count = g_new0(PageCounters, 1);
count->page_address = page;
g_hash_table_insert(pages, GUINT_TO_POINTER(page), (gpointer) count);
}
if (qemu_plugin_mem_is_store(meminfo)) {
count->writes++;
count->cpu_write |= (1 << cpu_index);
} else {
count->reads++;
count->cpu_read |= (1 << cpu_index);
}
g_mutex_unlock(&lock);
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
size_t i;
for (i = 0; i < n; i++) {
struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
qemu_plugin_register_vcpu_mem_cb(insn, vcpu_haddr,
QEMU_PLUGIN_CB_NO_REGS,
rw, NULL);
}
}
QEMU_PLUGIN_EXPORT
int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
int argc, char **argv)
{
int i;
for (i = 0; i < argc; i++) {
char *opt = argv[i];
if (g_strcmp0(opt, "reads") == 0) {
sort_by = SORT_R;
} else if (g_strcmp0(opt, "writes") == 0) {
sort_by = SORT_W;
} else if (g_strcmp0(opt, "address") == 0) {
sort_by = SORT_A;
} else if (g_strcmp0(opt, "io") == 0) {
track_io = true;
} else if (g_str_has_prefix(opt, "pagesize=")) {
page_size = g_ascii_strtoull(opt + 9, NULL, 10);
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
plugin_init();
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}
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