linux-kernel - Re: [RFC PATCH V3] mm readahead: Fix the readahead fail in case of empty numa node

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Message-ID: <52CD3D36.1010706@linux.vnet.ibm.com>
Date:	Wed, 08 Jan 2014 17:27:42 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Jan Kara <jack@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Damien Ramonda <damien.ramonda@...el.com>,
	Linus <torvalds@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V3] mm readahead: Fix the readahead fail in case of
 empty numa node

On 01/08/2014 04:17 PM, Jan Kara wrote:
> On Wed 08-01-14 14:19:23, Raghavendra K T wrote:
>> On 01/07/2014 03:43 AM, Andrew Morton wrote:
>>> On Mon,  6 Jan 2014 15:51:55 +0530 Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:
[...]
>> But having said that I am not able to get an idea of sane implementation
>> to solve this readahead failure bug overcoming the anomaly you pointed
>> :(.  hints/ideas.. ?? please let me know.
>    So if we would be happy with just fixing corner cases like this, we might
> use total node memory size to detect them, can't we? If total node memory
> size is 0, we can use 16 MB (or global number of free pages / 2 if we would
> be uneasy with fixed 16 MB limit) as an upperbound...
>

Thanks Honza.

This seems to be more sensible option, I 'll send the patch with that
change (including 16MB limit if nobody disagrees).

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