Messages in this thread | | | Date | Sun, 26 Apr 2015 22:48:53 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 2/3] mm: Send one IPI per CPU to TLB flush multiple pages that were recently unmapped |
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On 04/25/2015 01:45 PM, Mel Gorman wrote: > An IPI is sent to flush remote TLBs when a page is unmapped that was > recently accessed by other CPUs. There are many circumstances where this > happens but the obvious one is kswapd reclaiming pages belonging to a > running process as kswapd and the task are likely running on separate CPUs.
> It's still a noticeable improvement with vmstat showing interrupts went > from roughly 500K per second to 45K per second. > > The patch will have no impact on workloads with no memory pressure or > have relatively few mapped pages. > > Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
-- All rights reversed
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