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authorJeff Dike <jdike@addtoit.com>2007-05-06 14:51:19 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:13:02 -0700
commita18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e (patch)
tree4a822b5150773dd979f723232ed2d7169214d9bd
parent57ac895a7f22d235f637317f58a2d9ba6ec91a27 (diff)
downloadblackbird-op-linux-a18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e.tar.gz
blackbird-op-linux-a18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e.zip
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 <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>
-rw-r--r--arch/um/kernel/skas/exec.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/um/kernel/skas/exec.c b/arch/um/kernel/skas/exec.c
index 54b795951372..580eb6468949 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(&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);
}
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