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[Qemu-devel] [PATCH for-2.9] numa: make -numa parser dynamically allocat
From: |
Igor Mammedov |
Subject: |
[Qemu-devel] [PATCH for-2.9] numa: make -numa parser dynamically allocate CPUs masks |
Date: |
Fri, 18 Nov 2016 12:02:54 +0100 |
so it won't impose an additional limits on max_cpus limits
supported by different targets.
It removes global MAX_CPUMASK_BITS constant and need to
bump it up whenever max_cpus is being increased for
a target above MAX_CPUMASK_BITS value.
Use runtime max_cpus value instead to allocate sufficiently
sized node_cpu bitmasks in numa parser.
Signed-off-by: Igor Mammedov <address@hidden>
---
v1:
- replace bitmap_free() with g_free()
- drop bitmap_zero() as bitmap_new() returns already zerroed out one
CC: Alexey Kardashevskiy <address@hidden>
CC: Greg Kurz <address@hidden>
CC: David Gibson <address@hidden>
CC: Eduardo Habkost <address@hidden>
CC: Paolo Bonzini <address@hidden>
---
include/sysemu/numa.h | 2 +-
include/sysemu/sysemu.h | 7 -------
numa.c | 18 +++++++++++-------
vl.c | 5 -----
4 files changed, 12 insertions(+), 20 deletions(-)
diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
index 4da808a..8f09dcf 100644
--- a/include/sysemu/numa.h
+++ b/include/sysemu/numa.h
@@ -17,7 +17,7 @@ struct numa_addr_range {
typedef struct node_info {
uint64_t node_mem;
- DECLARE_BITMAP(node_cpu, MAX_CPUMASK_BITS);
+ unsigned long *node_cpu;
struct HostMemoryBackend *node_memdev;
bool present;
QLIST_HEAD(, numa_addr_range) addr; /* List to store address ranges */
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 66c6f15..cccde56 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -168,13 +168,6 @@ extern int mem_prealloc;
#define MAX_NODES 128
#define NUMA_NODE_UNASSIGNED MAX_NODES
-/* The following shall be true for all CPUs:
- * cpu->cpu_index < max_cpus <= MAX_CPUMASK_BITS
- *
- * Note that cpu->get_arch_id() may be larger than MAX_CPUMASK_BITS.
- */
-#define MAX_CPUMASK_BITS 288
-
#define MAX_OPTION_ROMS 16
typedef struct QEMUOptionRom {
const char *name;
diff --git a/numa.c b/numa.c
index 9c09e45..1b6fa78 100644
--- a/numa.c
+++ b/numa.c
@@ -266,20 +266,19 @@ static char *enumerate_cpus(unsigned long *cpus, int
max_cpus)
static void validate_numa_cpus(void)
{
int i;
- DECLARE_BITMAP(seen_cpus, MAX_CPUMASK_BITS);
+ unsigned long *seen_cpus = bitmap_new(max_cpus);
- bitmap_zero(seen_cpus, MAX_CPUMASK_BITS);
for (i = 0; i < nb_numa_nodes; i++) {
- if (bitmap_intersects(seen_cpus, numa_info[i].node_cpu,
- MAX_CPUMASK_BITS)) {
+ if (bitmap_intersects(seen_cpus, numa_info[i].node_cpu, max_cpus)) {
bitmap_and(seen_cpus, seen_cpus,
- numa_info[i].node_cpu, MAX_CPUMASK_BITS);
+ numa_info[i].node_cpu, max_cpus);
error_report("CPU(s) present in multiple NUMA nodes: %s",
enumerate_cpus(seen_cpus, max_cpus));
+ g_free(seen_cpus);
exit(EXIT_FAILURE);
}
bitmap_or(seen_cpus, seen_cpus,
- numa_info[i].node_cpu, MAX_CPUMASK_BITS);
+ numa_info[i].node_cpu, max_cpus);
}
if (!bitmap_full(seen_cpus, max_cpus)) {
@@ -291,12 +290,17 @@ static void validate_numa_cpus(void)
"in NUMA config");
g_free(msg);
}
+ g_free(seen_cpus);
}
void parse_numa_opts(MachineClass *mc)
{
int i;
+ for (i = 0; i < MAX_NODES; i++) {
+ numa_info[i].node_cpu = bitmap_new(max_cpus);
+ }
+
if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, NULL, NULL)) {
exit(1);
}
@@ -362,7 +366,7 @@ void parse_numa_opts(MachineClass *mc)
numa_set_mem_ranges();
for (i = 0; i < nb_numa_nodes; i++) {
- if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
+ if (!bitmap_empty(numa_info[i].node_cpu, max_cpus)) {
break;
}
}
diff --git a/vl.c b/vl.c
index d77dd86..37790e5 100644
--- a/vl.c
+++ b/vl.c
@@ -1277,11 +1277,6 @@ static void smp_parse(QemuOpts *opts)
max_cpus = qemu_opt_get_number(opts, "maxcpus", cpus);
- if (max_cpus > MAX_CPUMASK_BITS) {
- error_report("unsupported number of maxcpus");
- exit(1);
- }
-
if (max_cpus < cpus) {
error_report("maxcpus must be equal to or greater than smp");
exit(1);
--
2.7.4
- [Qemu-devel] [PATCH for-2.9] numa: make -numa parser dynamically allocate CPUs masks,
Igor Mammedov <=