init: defer free large memblock to Buddy allocator when CONFIG_ROCKCHIP_THUNDER_BOOT=y
The physical memory of a system is divided into several types, like
memory reserved for device, for kernel pagetable, etc. The remaining
area is for Buddy allocator. Normally, The memory for Buddy is consist
of different size blocks, so, under meeting the memory request of kernel
booting, we can defer free the large block size to Buddy which can be
done later in work queue in parallel to other kernel threads, and the
size of the large block can be defined in kernel command line
Save boot time about 6ms on 512MB rv1126 evb.
Change-Id: Ie7a8d3122d8d92ad918e8bf680f5949412709f37
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Tao Huang <huangtao@rock-chips.com>
diff --git a/init/main.c b/init/main.c
index 6a83b54..f6c21b2 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1531,6 +1531,10 @@ static noinline void __init kernel_init_freeable(void)
smp_init();
sched_init_smp();
+#ifdef CONFIG_ROCKCHIP_THUNDER_BOOT
+ kthread_run(defer_free_memblock, NULL, "defer_mem");
+#endif
+
padata_init();
page_alloc_init_late();
/* Initialize page ext after all struct pages are initialized. */