From 132b0d21d21f14f74fbe44dd5b8b1848215fff09 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Fri, 5 Nov 2021 13:42:38 -0700 Subject: mm/page_alloc: remove the throttling logic from the page allocator 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. Link: https://lkml.kernel.org/r/20211022144651.19914-6-mgorman@techsingularity.net Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka Cc: Andreas Dilger Cc: "Darrick J . Wong" Cc: Dave Chinner Cc: Johannes Weiner Cc: Jonathan Corbet Cc: Matthew Wilcox Cc: Michal Hocko Cc: NeilBrown Cc: Rik van Riel Cc: "Theodore Ts'o" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 21 +-------------------- 1 file changed, 1 insertion(+), 20 deletions(-) (limited to 'mm') diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0f1f1f353211..0f74a66bed19 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4791,30 +4791,11 @@ 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 -- cgit v1.2.3-58-ga151