diff options
author | Jeff Dike <jdike@addtoit.com> | 2007-05-06 14:51:19 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:13:02 -0700 |
commit | a18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e (patch) | |
tree | 4a822b5150773dd979f723232ed2d7169214d9bd /arch | |
parent | 57ac895a7f22d235f637317f58a2d9ba6ec91a27 (diff) | |
download | linux-a18ff1bde0c3da9ece3ba60e6eae2ef87f91a12e.tar.bz2 |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/um/kernel/skas/exec.c | 12 |
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(¤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); } |