[dpdk-stable] [PATCH][v4.9.y] Fixes: 3c226c637b69 ("mm: numa: avoid waiting on freed migrated pages")
Yongseok Koh
yskoh at mellanox.com
Wed Sep 5 08:34:40 CEST 2018
> On Sep 4, 2018, at 5:51 PM, Chas Williams <3chas3 at gmail.com> wrote:
>
> From: Chas Williams <chas3 at att.com>
>
> Commit 3c226c637b69 ("mm: numa: avoid waiting on freed migrated pages")
> was an incomplete backport of the upstream commit. It is necessary to
> always reset page_nid before attempting any early exit.
> ---
> mm/huge_memory.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 9efe88ef9702..e4c6c3edaf6a 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
Looks like a kernel patch has been sent to DPDK community. ;-)
Thanks,
Yongseok
> @@ -1259,12 +1259,12 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
>
> /* Migration could have started since the pmd_trans_migrating check */
> if (!page_locked) {
> + page_nid = -1;
> if (!get_page_unless_zero(page))
> goto out_unlock;
> spin_unlock(fe->ptl);
> wait_on_page_locked(page);
> put_page(page);
> - page_nid = -1;
> goto out;
> }
>
> --
> 2.14.4
>
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