linux-kernel - Re: [PATCH] mempolicy: convert the shared

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Message-ID: <564DA984.2040903@suse.cz>
Date:	Thu, 19 Nov 2015 11:50:44 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mgorman@...e.de>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mempolicy: convert the shared_policy lock to a rwlock

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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