netdev - Re: [RFC] net: use atomic allocation for order-3 page allocation

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Message-ID: <20150611220115.GA448912@devbig257.prn2.facebook.com>
Date:	Thu, 11 Jun 2015 15:01:15 -0700
From:	Shaohua Li <shli@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Chris Mason <clm@...com>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <Kernel-team@...com>,
	Eric Dumazet <edumazet@...gle.com>,
	David Rientjes <rientjes@...gle.com>, <linux-mm@...ck.org>
Subject: Re: [RFC] net: use atomic allocation for order-3 page allocation

On Thu, Jun 11, 2015 at 02:56:26PM -0700, Eric Dumazet wrote:
> On Thu, 2015-06-11 at 14:45 -0700, Shaohua Li wrote:
> 
> > This is exactly what the patch try to do. Atomic 32k allocation will
> > fail with memory pressure, kswapd is waken up to do compaction and we
> > fallback to 4k.
> 
> Read your changelog, then read what you just wrote.
> 
> Your changelog  said :
> 
> 'compaction will not be triggered and we will fallback to order-0
> immediately.'
> 
> Now you tell me that compaction is started.
> 
> What is the truth ?
> 
> Please make sure changelog is precise, this would avoid many mails.

Ah, ok. I mean direct compaction isn't triggered, kswapd is still waken
up to do compaction. I'll update the changelog.

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