From: Jaroslav Jindrak Date: Tue, 17 May 2022 14:38:58 +0200 Subject: hostmem: default the amount of prealloc-threads to smp-cpus Git-commit: f8d426a6852c560fdd8648ae961c8189909a4b82 References: bsc#1197084 Prior to the introduction of the prealloc-threads property, the amount of threads used to preallocate memory was derived from the value of smp-cpus passed to qemu, the amount of physical cpus of the host and a hardcoded maximum value. When the prealloc-threads property was introduced, it included a default of 1 in backends/hostmem.c and a default of smp-cpus using the sugar API for the property itself. The latter default is not used when the property is not specified on qemu's command line, so guests that were not adjusted for this change suddenly started to use the default of 1 thread to preallocate memory, which resulted in observable slowdowns in guest boots for guests with large memory (e.g. when using libvirt <8.2.0 or managing guests manually). This commit restores the original behavior for these cases while not impacting guests started with the prealloc-threads property in any way. Fixes: 220c1fd864e9d ("hostmem: introduce "prealloc-threads" property") Signed-off-by: Jaroslav Jindrak Message-Id: <20220517123858.7933-1-dzejrou@gmail.com> Signed-off-by: Paolo Bonzini Signed-off-by: Dario Faggioli --- backends/hostmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/backends/hostmem.c b/backends/hostmem.c index b2a5e905e866cd52f2f3e84f7d91..e4062a1c34920b5302fe57b8fdac 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -274,7 +274,7 @@ static void host_memory_backend_init(Object *obj) backend->merge = machine_mem_merge(machine); backend->dump = machine_dump_guest_core(machine); backend->reserve = true; - backend->prealloc_threads = 1; + backend->prealloc_threads = machine->smp.cpus; } static void host_memory_backend_post_init(Object *obj)