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Commit a18ff1bd authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds
Browse files

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: default avatarJeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 57ac895a

arch/um/kernel/skas/exec.c

+11 −1
Original line number Diff line number Diff line
@@ -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(&current->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(&current->mm->context.skas.id);

}