linux-kernel - RE: [PATCH v2] mm: show free pages per each migrate type

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Message-ID: <COL130-W1779F50C23B3E7EA23A707BAF80@phx.gbl>
Date:	Sun, 12 Apr 2015 07:17:11 +0000
From:	ZhangNeil <neilzhang1123@...mail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] mm: show free pages per each migrate type



----------------------------------------
> Date: Thu, 9 Apr 2015 21:24:41 -0700
> From: akpm@...ux-foundation.org
> To: neilzhang1123@...mail.com
> CC: linux-mm@...ck.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2] mm: show free pages per each migrate type
>
> On Fri, 10 Apr 2015 04:16:15 +0000 ZhangNeil <neilzhang1123@...mail.com> wrote:
>
>>> I think we can eliminate nr_free[][]:
>>
>> what about make it as global__variable?
>
> That isn't as good - it permanently consumes memory and really requires
> new locking to protect the array from concurrent callers.
>

Then it may need to change the code a lot.

BTW:
I calculate the nr_free[][] again, it is an 6x11 array of 8 in the worst case, that is 528B, is it acceptable?

Best Regards,
Neil Zhang 		 	   		  --
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