linux-kernel - Re: [PATCH 3/4] mm: Gather more PFNs before sending a TLB to flush unmapped pages

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Message-ID: <552FDC87.6040004@redhat.com>
Date:	Thu, 16 Apr 2015 12:00:07 -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 3/4] mm: Gather more PFNs before sending a TLB to flush
 unmapped pages

On 04/16/2015 06:22 AM, Mel Gorman wrote:
> The patch "mm: Send a single IPI to TLB flush multiple pages when unmapping"
> would batch 32 pages before sending an IPI. This patch increases the size of
> the data structure to hold a pages worth of PFNs before sending an IPI. This
> is a trade-off between memory usage and reducing IPIS sent. In the ideal
> case where multiple processes are reading large mapped files, this patch
> reduces interrupts/second from roughly 180K per second to 60K per second.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Reviewed-by: Rik van Riel <riel@...hat.com>

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