On Fri, 21 Sep 2007, Siddha, Suresh B wrote:
> Essentially quicklist free routines are doing something like
> __quicklist_free()
> ...
> if (unlikely(nid != numa_node_id())) {
> __free_page(page);
> ...
> }
>
> ....
>
>
> Now this will potentially cause a problem, if a cpu in someother node starts
> using this page, while the corresponding TLB entries are still alive
> in the original cpu which is still freeing the page table pages.
Hmmm... Yes could be.
> This potentially can cause SW failures and hard to debug issues like
> http://www.ussg.iu.edu/hypermail/linux/kernel/0205.2/1254.html
Cannot get to this page:
Not Found
The requested URL /hypermail/linux/kernel/0205.2/1254.htm was not found on
this server.
> Can we revert this commit for 2.6.23 and look at this code post 2.6.23?
We can remove this piece alone since it was an optimization.
---
include/linux/quicklist.h | 7 -------
1 file changed, 7 deletions(-)
Index: linux-2.6/include/linux/quicklist.h
===================================================================
--- linux-2.6.orig/include/linux/quicklist.h 2007-09-21 11:46:44.000000000 -0700
+++ linux-2.6/include/linux/quicklist.h 2007-09-21 11:47:01.000000000 -0700
@@ -58,13 +58,6 @@ static inline void __quicklist_free(int
struct quicklist *q;
int nid = page_to_nid(page);
- if (unlikely(nid != numa_node_id())) {
- if (dtor)
- dtor(p);
- __free_page(page);
- return;
- }
-
q = &get_cpu_var(quicklist)[nr];
*(void **)p = q->page;
q->page = p;
-
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