linux-kernel - Re: [PATCH] mremap: Avoid TLB flushing anonymous pages that are not in swap cache

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Message-ID: <20180605200058.fy4oy5znf6j4pckj@techsingularity.net>
Date:   Tue, 5 Jun 2018 21:00:58 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, mhocko@...nel.org,
        vbabka@...e.cz, Aaron Lu <aaron.lu@...el.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mremap: Avoid TLB flushing anonymous pages that are not
 in swap cache

On Tue, Jun 05, 2018 at 12:54:27PM -0700, Dave Hansen wrote:
> On 06/05/2018 12:51 PM, Mel Gorman wrote:
> > Using another testcase that simply calls mremap heavily with varying number
> > of threads, it was found that very broadly speaking that TLB shootdowns
> > were reduced by 31% on average throughout the entire test case but your
> > milage will vary.
> 
> Looks good to me.  Feel free to add my Reviewed-by.

Thanks, I'll send a proper v2 when I hear back from the customer on what
the impact on the real workload is.

-- 
Mel Gorman
SUSE Labs