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uml: speed up exec

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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 <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-05-06 14:51:19 -07:00 committed by Linus Torvalds
parent 57ac895a7f
commit a18ff1bde0
1 changed files with 11 additions and 1 deletions
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12
arch/um/kernel/skas/exec.c
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@ -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);
}