On Tue, 2022-05-31 at 17:20 +0530, Aneesh Kumar K.V wrote:
Davidlohr Bueso <dave@xxxxxxxxxxxx> writes:
> We have helpers for a reason.
>
> Signed-off-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
> ---
> mm/vmscan.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 1678802e03e7..cb583fcbf5bf 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -4750,7 +4750,7 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
> * over remote processors and spread off node memory allocations
> * as wide as possible.
> */
> - if (node_state(pgdat->node_id, N_CPU) && pgdat->node_id != numa_node_id())
> + if (node_is_toptier(pgdat->node_id) && pgdat->node_id != numa_node_id())
> return NODE_RECLAIM_NOSCAN;
>
>
> if (test_and_set_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags))
Are we really looking at the top tier in a tiered memory hierarchy here?
The comment seems to suggest we are looking at local NUMA node?
The code change itself is correct. But it is an implementation details
that node_is_toptier() == node_state(, N_CPU). And after we supporting
more memory tiers (like GPU, HBM), we will change the implementation of
node_is_toptier() soon. So I think that it's better to keep the
original code.