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From: Johannes Weiner <hannes@cmpxchg.org>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: akpm@linux-foundation.org, daniel.m.jordan@oracle.com,
	mhocko@suse.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH REBASED 1/4] mm: Move recent_rotated pages calculation to shrink_inactive_list()
Date: Tue, 28 May 2019 11:51:34 -0400	[thread overview]
Message-ID: <20190528155134.GA14663@cmpxchg.org> (raw)
In-Reply-To: <155290127956.31489.3393586616054413298.stgit@localhost.localdomain>

On Mon, Mar 18, 2019 at 12:27:59PM +0300, Kirill Tkhai wrote:
> @@ -1945,6 +1942,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
>  		count_memcg_events(lruvec_memcg(lruvec), PGSTEAL_DIRECT,
>  				   nr_reclaimed);
>  	}
> +	reclaim_stat->recent_rotated[0] = stat.nr_activate[0];
> +	reclaim_stat->recent_rotated[1] = stat.nr_activate[1];

Surely this should be +=, right?

Otherwise we maintain essentially no history of page rotations and
that wreaks havoc on the page cache vs. swapping reclaim balance.

  reply	other threads:[~2019-05-28 15:51 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-18  9:27 [PATCH REBASED 0/4] mm: Generalize putback functions Kirill Tkhai
2019-03-18  9:27 ` [PATCH REBASED 1/4] mm: Move recent_rotated pages calculation to shrink_inactive_list() Kirill Tkhai
2019-05-28 15:51   ` Johannes Weiner [this message]
2019-05-28 16:07     ` Kirill Tkhai
2019-03-18  9:28 ` [PATCH REBASED 2/4] mm: Move nr_deactivate accounting to shrink_active_list() Kirill Tkhai
2019-03-22 15:05   ` [PATCH] fixup: vmscan: Fix build on !CONFIG_MEMCG from nr_deactivate changes Chris Down
2019-03-22 15:06     ` Chris Down
2019-03-22 15:16     ` Kirill Tkhai
2019-03-18  9:28 ` [PATCH REBASED 3/4] mm: Remove pages_to_free argument of move_active_pages_to_lru() Kirill Tkhai
2019-03-18  9:28 ` [PATCH REBASED 4/4] mm: Generalize putback scan functions Kirill Tkhai

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