Subject: Re: [PATCH] mempolicy: convert the shared_policy lock to a rwlock
To: Nathan Zimmer <nzimmer@sgi.com>
References: <alpine.DEB.2.10.1511121301490.10324@chino.kir.corp.google.com>
 <1447777078-135492-1-git-send-email-nzimmer@sgi.com>
 <564C820D.1060105@suse.cz> <564CDA0F.40801@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Nadia Yvette Chambers <nyc@holomorphy.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Mel Gorman <mgorman@suse.de>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <564DA984.2040903@suse.cz>
Date: Thu, 19 Nov 2015 11:50:44 +0100
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On 11/18/2015 09:05 PM, Nathan Zimmer wrote:
>
>
> On 11/18/2015 07:50 AM, Vlastimil Babka wrote:
>> At first glance it seems that RCU would be a good fit here and achieve even
>> better lookup scalability, have you considered it?
>>
>
> Originally that was my plan but when I saw how good the results were
> with the rwlock, I chickened out and took the less prone to mistakes way.
>
> I should also note that the 2% time left in system is not from this lookup
> but another area.

Ah, I see, thanks!
Vlastimil

> Nate
>

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