@@ -364,38 +364,33 @@ void tcg_region_reset_all(void)
tcg_region_tree_reset_all();
}
-static size_t tcg_n_regions(unsigned max_cpus)
+static size_t tcg_n_regions(size_t tb_size, unsigned max_cpus)
{
#ifdef CONFIG_USER_ONLY
return 1;
#else
+ size_t n_regions;
+
/*
* It is likely that some vCPUs will translate more code than others,
* so we first try to set more regions than max_cpus, with those regions
* being of reasonable size. If that's not possible we make do by evenly
* dividing the code_gen_buffer among the vCPUs.
*/
- size_t i;
-
/* Use a single region if all we have is one vCPU thread */
if (max_cpus == 1 || !qemu_tcg_mttcg_enabled()) {
return 1;
}
- /* Try to have more regions than max_cpus, with each region being >= 2 MB */
- for (i = 8; i > 0; i--) {
- size_t regions_per_thread = i;
- size_t region_size;
-
- region_size = tcg_init_ctx.code_gen_buffer_size;
- region_size /= max_cpus * regions_per_thread;
-
- if (region_size >= 2 * 1024u * 1024) {
- return max_cpus * regions_per_thread;
- }
+ /*
+ * Try to have more regions than max_cpus, with each region being >= 2 MB.
+ * If we can't, then just allocate one region per vCPU thread.
+ */
+ n_regions = tb_size / (2 * MiB);
+ if (n_regions <= max_cpus) {
+ return max_cpus;
}
- /* If we can't, then just allocate one region per vCPU thread */
- return max_cpus;
+ return MIN(n_regions, max_cpus * 8);
#endif
}
@@ -833,7 +828,7 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
buf = tcg_init_ctx.code_gen_buffer;
total_size = tcg_init_ctx.code_gen_buffer_size;
page_size = qemu_real_host_page_size;
- n_regions = tcg_n_regions(max_cpus);
+ n_regions = tcg_n_regions(total_size, max_cpus);
/* The first region will be 'aligned - buf' bytes larger than the others */
aligned = QEMU_ALIGN_PTR_UP(buf, page_size);