diff options
| author | John Levon <levon@movementarian.org> | 2004-08-26 20:34:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-08-26 20:34:28 -0700 |
| commit | ddebb8b659b9b56c29cf6a8db3f100a9a4b00ef3 (patch) | |
| tree | 17c3d056d02cba7d37edcdb4853923bbff19f8ca /mm | |
| parent | 6e7ca99d18d0b57aecbd760a422ab42ea256f634 (diff) | |
| download | history-ddebb8b659b9b56c29cf6a8db3f100a9a4b00ef3.tar.gz | |
[PATCH] improve OProfile on many-way systems
Anton prompted me to get this patch merged. It changes the core buffer
sync algorithm of OProfile to avoid global locks wherever possible. Anton
tested an earlier version of this patch with some success. I've lightly
tested this applied against 2.6.8.1-mm3 on my two-way machine.
The changes also have the happy side-effect of losing less samples after
munmap operations, and removing the blind spot of tasks exiting inside the
kernel.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index e2b929e5b13210..c0c6e494144539 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1650,10 +1650,6 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) if (mpnt->vm_start >= end) return 0; - /* Something will probably happen, so notify. */ - if (mpnt->vm_file && (mpnt->vm_flags & VM_EXEC)) - profile_exec_unmap(mm); - /* * If we need to split any vma, do it now to save pain later. * @@ -1696,6 +1692,8 @@ asmlinkage long sys_munmap(unsigned long addr, size_t len) int ret; struct mm_struct *mm = current->mm; + profile_munmap(addr); + down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); @@ -1798,8 +1796,6 @@ void exit_mmap(struct mm_struct *mm) struct vm_area_struct *vma; unsigned long nr_accounted = 0; - profile_exit_mmap(mm); - lru_add_drain(); spin_lock(&mm->page_table_lock); |