From a18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Sun, 6 May 2007 14:51:19 -0700 Subject: [PATCH] uml: speed up exec flush_thread doesn't need to do a full page table walk in order to clear the address space. It knows what the end result needs to be, so it can call unmap directly. This results in a 10-20% speedup in an exec from bash. Signed-off-by: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/skas/exec.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/um/kernel/skas/exec.c b/arch/um/kernel/skas/exec.c index 54b7959..580eb64 100644 --- a/arch/um/kernel/skas/exec.c +++ b/arch/um/kernel/skas/exec.c @@ -17,7 +17,17 @@ void flush_thread_skas(void) { - force_flush_all(); + void *data = NULL; + unsigned long end = proc_mm ? task_size : CONFIG_STUB_START; + int ret; + + ret = unmap(¤t->mm->context.skas.id, 0, end, 1, &data); + if(ret){ + printk("flush_thread_skas - clearing address space failed, " + "err = %d\n", ret); + force_sig(SIGKILL, current); + } + switch_mm_skas(¤t->mm->context.skas.id); } -- 2.7.4