linux-kernel - Re: [patch] mm, page_alloc: wakeup kcompactd even if kswapd cannot free more memory

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Message-ID: <alpine.DEB.2.20.1803201325530.167205@chino.kir.corp.google.com>
Date:   Tue, 20 Mar 2018 13:26:16 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Vlastimil Babka <vbabka@...e.cz>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, page_alloc: wakeup kcompactd even if kswapd cannot
 free more memory

On Tue, 20 Mar 2018, Vlastimil Babka wrote:

> > Kswapd will not wakeup if per-zone watermarks are not failing or if too
> > many previous attempts at background reclaim have failed.
> > 
> > This can be true if there is a lot of free memory available.  For high-
> > order allocations, kswapd is responsible for waking up kcompactd for
> > background compaction.  If the zone is now below its watermarks or
>                                          not ?
> 

Good catch, Andrew please let me know if you would like a resend to 
correct this.