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authorMark Kanda <mark.kanda@oracle.com>2024-01-31 10:53:27 -0600
committerDavid Hildenbrand <david@redhat.com>2024-02-06 08:15:22 +0100
commit04accf43df83aa10f06f7dbda3ecf0db97f0c5a6 (patch)
treec5668fe7f5ae98622af2f69ac4f2a97ff219a97a /backends
parent540a1abbf0b243e4cfb4333c5d30a041f7080ba4 (diff)
oslib-posix: initialize backend memory objects in parallel
QEMU initializes preallocated backend memory as the objects are parsed from the command line. This is not optimal in some cases (e.g. memory spanning multiple NUMA nodes) because the memory objects are initialized in series. Allow the initialization to occur in parallel (asynchronously). In order to ensure optimal thread placement, asynchronous initialization requires prealloc context threads to be in use. Signed-off-by: Mark Kanda <mark.kanda@oracle.com> Message-ID: <20240131165327.3154970-2-mark.kanda@oracle.com> Tested-by: Mario Casquero <mcasquer@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'backends')
-rw-r--r--backends/hostmem.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/backends/hostmem.c b/backends/hostmem.c
index 987f6f591e..81a72ce40b 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -20,6 +20,7 @@
#include "qom/object_interfaces.h"
#include "qemu/mmap-alloc.h"
#include "qemu/madvise.h"
+#include "hw/qdev-core.h"
#ifdef CONFIG_NUMA
#include <numaif.h>
@@ -237,7 +238,7 @@ static void host_memory_backend_set_prealloc(Object *obj, bool value,
uint64_t sz = memory_region_size(&backend->mr);
if (!qemu_prealloc_mem(fd, ptr, sz, backend->prealloc_threads,
- backend->prealloc_context, errp)) {
+ backend->prealloc_context, false, errp)) {
return;
}
backend->prealloc = true;
@@ -323,6 +324,7 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
void *ptr;
uint64_t sz;
+ bool async = !phase_check(PHASE_LATE_BACKENDS_CREATED);
if (!bc->alloc) {
return;
@@ -402,7 +404,8 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
if (backend->prealloc && !qemu_prealloc_mem(memory_region_get_fd(&backend->mr),
ptr, sz,
backend->prealloc_threads,
- backend->prealloc_context, errp)) {
+ backend->prealloc_context,
+ async, errp)) {
return;
}
}