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author | Igor Mammedov <imammedo@redhat.com> | 2020-02-19 11:09:50 -0500 |
---|---|---|
committer | Patchew Importer <importer@patchew.org> | 2020-02-19 16:50:02 +0000 |
commit | ffac16fab33bb42f17e47624985220c1fd864e9d (patch) | |
tree | bdf0d5089bbfed0c3f042c6c7af9d0afdf4a5e90 /backends | |
parent | 8b38de9f62cfc3d8d6f946c47e8afb6138539517 (diff) | |
download | qemu-ffac16fab33bb42f17e47624985220c1fd864e9d.zip qemu-ffac16fab33bb42f17e47624985220c1fd864e9d.tar.gz qemu-ffac16fab33bb42f17e47624985220c1fd864e9d.tar.bz2 |
hostmem: introduce "prealloc-threads" property
the property will allow user to specify number of threads to use
in pre-allocation stage. It also will allow to reduce implicit
hostmem dependency on current_machine.
On object creation it will default to 1, but via machine
compat property it will be updated to MachineState::smp::cpus
to keep current behavior for hostmem and main RAM (which is
now also hostmem based).
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20200219160953.13771-77-imammedo@redhat.com>
Diffstat (limited to 'backends')
-rw-r--r-- | backends/hostmem.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/backends/hostmem.c b/backends/hostmem.c index e773bdf..0988986 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -223,7 +223,6 @@ static void host_memory_backend_set_prealloc(Object *obj, bool value, { Error *local_err = NULL; HostMemoryBackend *backend = MEMORY_BACKEND(obj); - MachineState *ms = MACHINE(qdev_get_machine()); if (backend->force_prealloc) { if (value) { @@ -243,7 +242,7 @@ static void host_memory_backend_set_prealloc(Object *obj, bool value, void *ptr = memory_region_get_ram_ptr(&backend->mr); uint64_t sz = memory_region_size(&backend->mr); - os_mem_prealloc(fd, ptr, sz, ms->smp.cpus, &local_err); + os_mem_prealloc(fd, ptr, sz, backend->prealloc_threads, &local_err); if (local_err) { error_propagate(errp, local_err); return; @@ -252,14 +251,45 @@ static void host_memory_backend_set_prealloc(Object *obj, bool value, } } +static void host_memory_backend_get_prealloc_threads(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + visit_type_uint32(v, name, &backend->prealloc_threads, errp); +} + +static void host_memory_backend_set_prealloc_threads(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + Error *local_err = NULL; + uint32_t value; + + visit_type_uint32(v, name, &value, &local_err); + if (local_err) { + goto out; + } + if (value <= 0) { + error_setg(&local_err, + "property '%s' of %s doesn't take value '%d'", + name, object_get_typename(obj), value); + goto out; + } + backend->prealloc_threads = value; +out: + error_propagate(errp, local_err); +} + static void host_memory_backend_init(Object *obj) { HostMemoryBackend *backend = MEMORY_BACKEND(obj); MachineState *machine = MACHINE(qdev_get_machine()); + /* TODO: convert access to globals to compat properties */ backend->merge = machine_mem_merge(machine); backend->dump = machine_dump_guest_core(machine); backend->prealloc = mem_prealloc; + backend->prealloc_threads = 1; } static void host_memory_backend_post_init(Object *obj) @@ -313,7 +343,6 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp) { HostMemoryBackend *backend = MEMORY_BACKEND(uc); HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc); - MachineState *ms = MACHINE(qdev_get_machine()); Error *local_err = NULL; void *ptr; uint64_t sz; @@ -378,7 +407,7 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp) */ if (backend->prealloc) { os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz, - ms->smp.cpus, &local_err); + backend->prealloc_threads, &local_err); if (local_err) { goto out; } @@ -456,6 +485,12 @@ host_memory_backend_class_init(ObjectClass *oc, void *data) host_memory_backend_set_prealloc, &error_abort); object_class_property_set_description(oc, "prealloc", "Preallocate memory", &error_abort); + object_class_property_add(oc, "prealloc-threads", "int", + host_memory_backend_get_prealloc_threads, + host_memory_backend_set_prealloc_threads, + NULL, NULL, &error_abort); + object_class_property_set_description(oc, "prealloc-threads", + "Number of CPU threads to use for prealloc", &error_abort); object_class_property_add(oc, "size", "int", host_memory_backend_get_size, host_memory_backend_set_size, |