Hello Hugh
On Mon, Jan 7, 2013 at 3:06 AM, Hugh Dickins <hu...@google.com> wrote:
> I don't entirely like your patch (or the original code): shouldn't
> there be a wait_split_huge_page(), rather than hammering back with
> repeated faults until the split has completed?
>
I take another try with waiting added, take a look please.
Hillf
---
--- a/mm/memory.c Sun Jan 6 19:49:50 2013
+++ b/mm/memory.c Mon Jan 7 20:16:14 2013
@@ -3710,6 +3710,11 @@ retry:
return do_huge_pmd_numa_page(mm, vma, address,
orig_pmd, pmd);
+ /* Check if pmd is stable */
+ if (pmd_trans_splitting(orig_pmd)) {
+ wait_split_huge_page(vma->anon_vma, pmd);
+ goto retry;
+ }
if (dirty && !pmd_write(orig_pmd)) {
ret = do_huge_pmd_wp_page(mm, vma, address, pmd,
orig_pmd);
--
--
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