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From: "NeilBrown" <neilb@suse.de>
To: "Mel Gorman" <mgorman@techsingularity.net>
Cc: "Linux-MM" <linux-mm@kvack.org>, "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: Re: [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested
Date: Tue, 21 Sep 2021 10:13:17 +1000	[thread overview]
Message-ID: <163218319798.3992.1165186037496786892@noble.neil.brown.name> (raw)
In-Reply-To: <20210920085436.20939-2-mgorman@techsingularity.net>

On Mon, 20 Sep 2021, Mel Gorman wrote:
> -long wait_iff_congested(int sync, long timeout)
> -{
> -	long ret;
> -	unsigned long start = jiffies;
> -	DEFINE_WAIT(wait);
> -	wait_queue_head_t *wqh = &congestion_wqh[sync];
> -
> -	/*
> -	 * If there is no congestion, yield if necessary instead
> -	 * of sleeping on the congestion queue
> -	 */
> -	if (atomic_read(&nr_wb_congested[sync]) == 0) {
> -		cond_resched();
> -
> -		/* In case we scheduled, work out time remaining */
> -		ret = timeout - (jiffies - start);
> -		if (ret < 0)
> -			ret = 0;
> -
> -		goto out;
> -	}
> -
> -	/* Sleep until uncongested or a write happens */
> -	prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);

Uninterruptible wait.

....
> +static void
> +reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason,
> +							long timeout)
> +{
> +	wait_queue_head_t *wqh = &pgdat->reclaim_wait;
> +	unsigned long start = jiffies;
> +	long ret;
> +	DEFINE_WAIT(wait);
> +
> +	atomic_inc(&pgdat->nr_reclaim_throttled);
> +	WRITE_ONCE(pgdat->nr_reclaim_start,
> +		 node_page_state(pgdat, NR_THROTTLED_WRITTEN));
> +
> +	prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE);

Interruptible wait.

Why the change?  I think these waits really need to be TASK_UNINTERRUPTIBLE.

Thanks,
NeilBrown

  parent reply	other threads:[~2021-09-21  0:16 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20  8:54 [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-09-20  8:54 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-09-20 23:19   ` NeilBrown
2021-09-21 11:12     ` Mel Gorman
2021-09-21 21:27       ` NeilBrown
2021-09-21  0:13   ` NeilBrown [this message]
2021-09-21 10:58     ` Mel Gorman
2021-09-21 21:40       ` NeilBrown
2021-09-22  6:04       ` Dave Chinner
2021-09-22  8:03         ` Mel Gorman
2021-09-22 12:16   ` Hillf Danton
2021-09-22 14:13     ` Mel Gorman
2021-09-20  8:54 ` [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-09-20 23:27   ` NeilBrown
2021-09-21 11:03     ` Mel Gorman
2021-09-21 18:45   ` Yang Shi
2021-09-21 18:45     ` Yang Shi
2021-09-22  8:11     ` Mel Gorman
2021-09-20  8:54 ` [PATCH 3/5] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-09-20 23:31   ` NeilBrown
2021-09-21 11:16     ` Mel Gorman
2021-09-21 21:46       ` NeilBrown
2021-09-22  9:21         ` Mel Gorman
2021-09-20  8:54 ` [PATCH 4/5] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-09-20  8:54 ` [PATCH 5/5] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-09-20 11:42 ` [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Matthew Wilcox
2021-09-20 12:50   ` Mel Gorman
2021-09-20 14:11     ` David Sterba
2021-09-21 11:18       ` Mel Gorman
2021-09-20 19:51   ` Mel Gorman
2021-09-21 20:46 ` Dave Chinner
2021-09-22 17:52   ` Mel Gorman
2021-09-29 10:09 [PATCH 0/5] Remove dependency on congestion_wait in mm/ v2 Mel Gorman
2021-09-29 10:09 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman

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