when a cpu is up, predefined number of stacks are allocated and cached immediately.
Signed-off-by: Hoeun Ryu <[email protected]> --- kernel/fork.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/kernel/fork.c b/kernel/fork.c index 50de6cf..ee4067d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -194,6 +194,21 @@ static int alloc_vm_stack_cache(unsigned int cpu) vm_stack_cache->cur = 0; vm_stack_cache->nr = 0; + for (i = 0; i < NR_CACHED_STACKS; i++) { + void *stack = __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE, + VMALLOC_START, VMALLOC_END, + THREADINFO_GFP | __GFP_HIGHMEM, + PAGE_KERNEL, + 0, cpu_to_node(cpu), + __builtin_return_address(0)); + if (!stack) + return -ENOMEM; + + vm_stacks[i] = find_vm_area(stack); + vm_stack_cache->cur++; + vm_stack_cache->nr++; + } + return 0; } -- 2.7.4
