From: Vlastimil Babka <vbabka@suse.cz>
To: Mel Gorman <mgorman@techsingularity.net>, 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>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Corbet <corbet@lwn.net>,
Linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress
Date: Thu, 14 Oct 2021 17:39:09 +0200 [thread overview]
Message-ID: <d69cce37-e91d-b20b-9f37-4ef1b1c3e46c@suse.cz> (raw)
In-Reply-To: <20211008135332.19567-8-mgorman@techsingularity.net>
On 10/8/21 15:53, Mel Gorman wrote:
> Tracing of the stutterp workload showed the following delays
>
> 1 usect_delayed=124000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=128000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=176000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=536000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=544000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=556000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=624000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=716000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 1 usect_delayed=772000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 2 usect_delayed=512000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 16 usect_delayed=120000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 53 usect_delayed=116000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 116 usect_delayed=112000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 5907 usect_delayed=108000 reason=VMSCAN_THROTTLE_NOPROGRESS
> 71741 usect_delayed=104000 reason=VMSCAN_THROTTLE_NOPROGRESS
>
> All the throttling hit the full timeout and then there was wakeup delays
> meaning that the wakeups are premature as no other reclaimer such as
> kswapd has made progress. This patch increases the maximum timeout.
>
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/vmscan.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index e096e81dcbd8..7b54fec4072c 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1038,6 +1038,8 @@ void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason)
> */
> switch(reason) {
> case VMSCAN_THROTTLE_NOPROGRESS:
> + timeout = HZ/2;
> + break;
> case VMSCAN_THROTTLE_WRITEBACK:
> timeout = HZ/10;
> break;
>
next prev parent reply other threads:[~2021-10-14 15:39 UTC|newest]
Thread overview: 27+ 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 [this message]
2021-10-08 13:53 ` [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS Mel Gorman
2021-10-14 15:41 ` 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 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress Mel Gorman
2021-10-22 1:07 ` NeilBrown
2021-10-22 8:14 ` 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 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress Mel Gorman
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