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Date: Thu, 16 Apr 2015 12:01:24 -0400 From: Rik van Riel <riel@...hat.com> To: Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org> CC: Hugh Dickins <hughd@...gle.com>, Minchan Kim <minchan@...nel.org>, Dave Hansen <dave.hansen@...el.com>, Andi Kleen <andi@...stfloor.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 4/4] mm: migrate: Batch TLB flushing when unmapping pages for migration On 04/16/2015 06:22 AM, Mel Gorman wrote: > Page reclaim batches multiple TLB flushes into one IPI and this patch teaches > page migration to also batch any necessary flushes. MMtests has a THP scale > microbenchmark that deliberately fragments memory and then allocates THPs > to stress compaction. It's not a page reclaim benchmark and recent kernels > avoid excessive compaction but this patch reduced system CPU usage > > 4.0.0 4.0.0 > baseline batchmigrate-v1 > User 970.70 1012.24 > System 2067.48 1840.00 > Elapsed 1520.63 1529.66 > > Note that this particular workload was not TLB flush intensive with peaks > in interrupts during the compaction phase. The 4.0 kernel peaked at 345K > interrupts/second, the kernel that batches reclaim TLB entries peaked at > 13K interrupts/second and this patch peaked at 10K interrupts/second. > > Signed-off-by: Mel Gorman <mgorman@...e.de> Reviewed-by: Rik van Riel <riel@...hat.com> -- 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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