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oslib-posix: initialize backend memory objects in parallel

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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>
This commit is contained in:
Mark Kanda
2024-01-31 10:53:27 -06:00
committed by David Hildenbrand
parent 540a1abbf0
commit 04accf43df
7 changed files with 145 additions and 37 deletions
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7
backends/hostmem.c
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@ -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;
}
}