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From: Mel Gorman <mgorman@techsingularity.net>
To: NeilBrown <neilb@suse.de>
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>
Subject: Re: [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated
Date: Tue, 21 Sep 2021 12:03:23 +0100	[thread overview]
Message-ID: <20210921110323.GP3959@techsingularity.net> (raw)
In-Reply-To: <163218047640.3992.16597395100064789255@noble.neil.brown.name>

On Tue, Sep 21, 2021 at 09:27:56AM +1000, NeilBrown wrote:
> On Mon, 20 Sep 2021, Mel Gorman wrote:
> > @@ -2291,8 +2302,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
> >  			return 0;
> >  
> >  		/* wait a bit for the reclaimer. */
> > -		msleep(100);
> > -		stalled = true;
> > +		reclaim_throttle(pgdat, VMSCAN_THROTTLE_ISOLATED, HZ/10);
> 
> Why drop the assignment to "stalled"?
> Doing that changes the character of the loop - and makes the 'stalled'
> variable always 'false'.
> 

This was a thought that was never completed. The intent was that if
there are too many pages isolated that it should not return prematurely
and do busy work elsewhere. It potentially means an allocation request
moves to lower zones or remote nodes prematurely but I never did the
full removal. Even if I had, on reflection, that type of behavioural
change does not belong in this series.

I've restored the "stalled = true".

-- 
Mel Gorman
SUSE Labs

  reply	other threads:[~2021-09-21 11:03 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
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 [this message]
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 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman

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