From: Mel Gorman <mgorman@techsingularity.net>
To: Linux-MM <linux-mm@kvack.org>
Cc: NeilBrown <neilb@suse.de>, Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Darrick J . Wong" <djwong@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Michal Hocko <mhocko@suse.com>,
Dave Chinner <david@fromorbit.com>,
Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Corbet <corbet@lwn.net>,
Linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS
Date: Fri, 8 Oct 2021 14:53:32 +0100 [thread overview]
Message-ID: <20211008135332.19567-9-mgorman@techsingularity.net> (raw)
In-Reply-To: <20211008135332.19567-1-mgorman@techsingularity.net>
Tracing indicates that tasks throttled on NOPROGRESS are woken
prematurely resulting in occasional massive spikes in direct
reclaim activity. This patch wakes tasks throttled on NOPROGRESS
if reclaim efficiency is at least 12%.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
mm/vmscan.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7b54fec4072c..80a9a26f701f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3338,8 +3338,11 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
static void consider_reclaim_throttle(pg_data_t *pgdat, struct scan_control *sc)
{
- /* If reclaim is making progress, wake any throttled tasks. */
- if (sc->nr_reclaimed) {
+ /*
+ * If reclaim is making progress greater than 12% efficiency then
+ * wake all the NOPROGRESS throttled tasks.
+ */
+ if (sc->nr_reclaimed > (sc->nr_scanned >> 3)) {
wait_queue_head_t *wqh;
wqh = &pgdat->reclaim_wait[VMSCAN_THROTTLE_NOPROGRESS];
--
2.31.1
next prev parent reply other threads:[~2021-10-08 13:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-08 13:53 [PATCH v3 0/8] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-10-08 13:53 ` [PATCH 1/8] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-10-13 15:39 ` Vlastimil Babka
2021-10-14 10:47 ` Mel Gorman
2021-10-14 15:42 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 2/8] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-10-14 8:06 ` Vlastimil Babka
2021-10-14 11:56 ` Mel Gorman
2021-10-14 15:44 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 3/8] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-10-14 12:31 ` Vlastimil Babka
2021-10-14 13:03 ` Mel Gorman
2021-10-14 15:45 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 4/8] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-10-14 15:34 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 5/8] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-10-14 15:36 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 6/8] mm/vmscan: Centralise timeout values for reclaim_throttle Mel Gorman
2021-10-14 15:38 ` Vlastimil Babka
2021-10-08 13:53 ` [PATCH 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress Mel Gorman
2021-10-14 15:39 ` Vlastimil Babka
2021-10-08 13:53 ` Mel Gorman [this message]
2021-10-14 15:41 ` [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS Vlastimil Babka
2021-10-19 9:01 [PATCH v4 0/8] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-10-19 9:01 ` [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS Mel Gorman
2021-10-22 14:46 [PATCH v5 0/8] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-10-22 14:46 ` [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS Mel Gorman
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