From: Rik van Riel <riel@redhat.com>
To: Johannes Weiner <hannes@cmpxchg.org>,
David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Mel Gorman <mgorman@techsingularity.net>,
Michal Hocko <mhocko@kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [RFC PATCH 0/6] proactive kcompactd
Date: Mon, 21 Aug 2017 17:40:45 -0400 [thread overview]
Message-ID: <1503351645.6577.76.camel@redhat.com> (raw)
In-Reply-To: <20170821141014.GC1371@cmpxchg.org>
On Mon, 2017-08-21 at 10:10 -0400, Johannes Weiner wrote:
>
> I've been toying around with the below patch. It adds a free page
> bitmap, allowing the free scanner to quickly skip over the vast areas
> of used memory. I don't have good data on skip-efficiency at higher
> uptimes and the resulting fragmentation yet. The overhead added to
> the
> page allocator is concerning, but I cannot think of a better way to
> make the search more efficient. What do you guys think?
Michael Tsirkin and I have been thinking about using a bitmap
to allow KVM guests to tell the host which pages are free (and
could be discarded by the host).
Having multiple users for the bitmap makes having one much more
compelling...
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next prev parent reply other threads:[~2017-08-21 21:40 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-27 16:06 [RFC PATCH 0/6] proactive kcompactd Vlastimil Babka
2017-07-27 16:06 ` [PATCH 1/6] mm, kswapd: refactor kswapd_try_to_sleep() Vlastimil Babka
2017-07-28 9:38 ` Mel Gorman
2017-07-27 16:06 ` [PATCH 2/6] mm, kswapd: don't reset kswapd_order prematurely Vlastimil Babka
2017-07-28 10:16 ` Mel Gorman
2017-07-27 16:06 ` [PATCH 3/6] mm, kswapd: reset kswapd's order to 0 when it fails to reclaim enough Vlastimil Babka
2017-07-27 16:06 ` [PATCH 4/6] mm, kswapd: wake up kcompactd when kswapd had too many failures Vlastimil Babka
2017-07-28 10:41 ` Mel Gorman
2017-07-27 16:07 ` [RFC PATCH 5/6] mm, compaction: stop when number of free pages goes below watermark Vlastimil Babka
2017-07-28 10:43 ` Mel Gorman
2017-07-27 16:07 ` [RFC PATCH 6/6] mm: make kcompactd more proactive Vlastimil Babka
2017-07-28 10:58 ` Mel Gorman
2017-08-09 20:58 ` [RFC PATCH 0/6] proactive kcompactd David Rientjes
2017-08-21 14:10 ` Johannes Weiner
2017-08-21 21:40 ` Rik van Riel [this message]
2017-08-22 20:57 ` David Rientjes
2017-08-23 5:36 ` Joonsoo Kim
2017-08-23 8:12 ` Vlastimil Babka
2017-08-24 6:24 ` Joonsoo Kim
2017-08-24 11:30 ` Vlastimil Babka
2017-08-24 23:51 ` Joonsoo Kim
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