From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mgorman@suse.de>, Linux-MM <linux-mm@kvack.org>
Cc: Hugh Dickins <hughd@google.com>, Minchan Kim <minchan@kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Andi Kleen <andi@firstfloor.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] mm: Send one IPI per CPU to TLB flush multiple pages that were recently unmapped
Date: Sun, 26 Apr 2015 22:48:53 -0400 [thread overview]
Message-ID: <553DA395.803@redhat.com> (raw)
In-Reply-To: <1429983942-4308-3-git-send-email-mgorman@suse.de>
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>
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next prev parent reply other threads:[~2015-04-27 2:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 17:45 [PATCH 0/3] TLB flush multiple pages per IPI v4 Mel Gorman
2015-04-25 17:45 ` [PATCH 1/3] x86, mm: Trace when an IPI is about to be sent Mel Gorman
2015-04-25 17:45 ` [PATCH 2/3] mm: Send one IPI per CPU to TLB flush multiple pages that were recently unmapped Mel Gorman
2015-04-27 2:48 ` Rik van Riel [this message]
2015-04-25 17:45 ` [PATCH 3/3] mm: Defer flush of writable TLB entries Mel Gorman
2015-04-27 2:50 ` Rik van Riel
2015-08-31 16:20 ` [PATCH 0/3] TLB flush multiple pages per IPI v4 Sébastien Wacquiez
-- strict thread matches above, loose matches on Subject: below --
2015-06-08 12:50 [PATCH 0/3] TLB flush multiple pages per IPI v5 Mel Gorman
2015-06-08 12:50 ` [PATCH 2/3] mm: Send one IPI per CPU to TLB flush multiple pages that were recently unmapped Mel Gorman
2015-06-08 22:38 ` Andrew Morton
2015-06-09 11:07 ` Mel Gorman
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