Re: [PATCH 5/8] mm/page_alloc: Remove the throttling logic from the page allocator

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On 10/22/21 16:46, Mel Gorman wrote:
> The page allocator stalls based on the number of pages that are
> waiting for writeback to start but this should now be redundant.
> shrink_inactive_list() will wake flusher threads if the LRU tail are
> unqueued dirty pages so the flusher should be active. If it fails to make
> progress due to pages under writeback not being completed quickly then
> it should stall on VMSCAN_THROTTLE_WRITEBACK.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>

Acked-by: Vlastimil Babka <vbabka@xxxxxxx>

> ---
>  mm/page_alloc.c | 21 +--------------------
>  1 file changed, 1 insertion(+), 20 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 78e538067651..8fa0109ff417 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4795,30 +4795,11 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
>  		trace_reclaim_retry_zone(z, order, reclaimable,
>  				available, min_wmark, *no_progress_loops, wmark);
>  		if (wmark) {
> -			/*
> -			 * If we didn't make any progress and have a lot of
> -			 * dirty + writeback pages then we should wait for
> -			 * an IO to complete to slow down the reclaim and
> -			 * prevent from pre mature OOM
> -			 */
> -			if (!did_some_progress) {
> -				unsigned long write_pending;
> -
> -				write_pending = zone_page_state_snapshot(zone,
> -							NR_ZONE_WRITE_PENDING);
> -
> -				if (2 * write_pending > reclaimable) {
> -					congestion_wait(BLK_RW_ASYNC, HZ/10);
> -					return true;
> -				}
> -			}
> -
>  			ret = true;
> -			goto out;
> +			break;
>  		}
>  	}
>  
> -out:
>  	/*
>  	 * Memory allocation/reclaim might be called from a WQ context and the
>  	 * current implementation of the WQ concurrency control doesn't
> 




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