linux-kernel - Re: [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated

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Date:   Tue, 21 Sep 2021 09:27:56 +1000
From:   "NeilBrown" <neilb@...e.de>
To:     "Mel Gorman" <mgorman@...hsingularity.net>
Cc:     "Linux-MM" <linux-mm@...ck.org>, "Theodore Ts'o" <tytso@....edu>,
        "Andreas Dilger" <adilger.kernel@...ger.ca>,
        "Darrick J . Wong" <djwong@...nel.org>,
        "Matthew Wilcox" <willy@...radead.org>,
        "Michal Hocko" <mhocko@...e.com>,
        "Dave Chinner" <david@...morbit.com>,
        "Rik van Riel" <riel@...riel.com>,
        "Vlastimil Babka" <vbabka@...e.cz>,
        "Johannes Weiner" <hannes@...xchg.org>,
        "Jonathan Corbet" <corbet@....net>,
        "Linux-fsdevel" <linux-fsdevel@...r.kernel.org>,
        "LKML" <linux-kernel@...r.kernel.org>,
        "Mel Gorman" <mgorman@...hsingularity.net>
Subject: Re: [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too
 may pages are isolated

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'.

NeilBrown