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Subject[PATCH] exec: remove page_table_lock for mm counters in acct_arg_size()
Date
Commit 172703b mm: delete non-atomic mm counter implementation
removed non-atomic mm counters implementation. I think there is no need to hold
page_table_lock for add_mm_counter() when the splitted page table locks are not
used. This patch removes the locking.

Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
---
fs/exec.c | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 6075a1e..e6fc5e1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -182,13 +182,7 @@ static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)

bprm->vma_pages = pages;

-#ifdef SPLIT_RSS_COUNTING
add_mm_counter(mm, MM_ANONPAGES, diff);
-#else
- spin_lock(&mm->page_table_lock);
- add_mm_counter(mm, MM_ANONPAGES, diff);
- spin_unlock(&mm->page_table_lock);
-#endif
}

static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
--
1.7.4.4


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