From: "Wilco Dijkstra" <wdijkstr@arm.com>
To: linux-mm@kvack.org
Subject: Background page clearing
Date: Fri, 25 Jul 2014 16:06:51 +0100 [thread overview]
Message-ID: <000001cfa81a$110d15c0$33274140$@com> (raw)
Hi,
I recently noticed how a Stream benchmark took 30% more time in the first iteration due to having to
clean pages in the output array. Especially clearing a huge page on a pagefault is a substantial
overhead. It affects the cached data of the workload while it is running and reduces available
memory bandwidth.
Is there a reason Linux does not do background page clearing like other OSes to reduce this
overhead? It would be a good fit for typical mobile workloads (bursts of high activity followed by
periods of low activity).
Wilco
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next reply other threads:[~2014-07-25 15:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 15:06 Wilco Dijkstra [this message]
2014-07-25 15:19 ` Background page clearing Dave Hansen
2014-07-25 16:27 ` Wilco Dijkstra
2014-07-25 16:32 ` Dave Hansen
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