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Message-ID: <20121218100449.GK9887@suse.de> Date: Tue, 18 Dec 2012 10:04:50 +0000 From: Mel Gorman <mgorman@...e.de> To: Johannes Weiner <hannes@...xchg.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com>, Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>, Satoru Moriya <satoru.moriya@....com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [patch 3/7] mm: vmscan: clarify how swappiness, highest priority, memcg interact On Mon, Dec 17, 2012 at 01:12:33PM -0500, Johannes Weiner wrote: > A swappiness of 0 has a slightly different meaning for global reclaim > (may swap if file cache really low) and memory cgroup reclaim (never > swap, ever). > > In addition, global reclaim at highest priority will scan all LRU > lists equal to their size and ignore other balancing heuristics. > UNLESS swappiness forbids swapping, then the lists are balanced based > on recent reclaim effectiveness. UNLESS file cache is running low, > then anonymous pages are force-scanned. > > This (total mess of a) behaviour is implicit and not obvious from the > way the code is organized. At least make it apparent in the code flow > and document the conditions. It will be it easier to come up with > sane semantics later. > > Signed-off-by: Johannes Weiner <hannes@...xchg.org> Acked-by: Mel Gorman <mgorman@...e.de> -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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