linux-kernel - Re: [PATCH] mm: readahead: get back a sensible upper limit

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Message-ID: <20150224220843.GL19014@t510.redhat.com>
Date:	Tue, 24 Feb 2015 17:08:44 -0500
From:	Rafael Aquini <aquini@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	loberman@...hat.com, Larry Woodman <lwoodman@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm: readahead: get back a sensible upper limit

On Tue, Feb 24, 2015 at 01:56:25PM -0800, Linus Torvalds wrote:
> On Tue, Feb 24, 2015 at 4:58 AM, Rafael Aquini <aquini@...hat.com> wrote:
> >
> > This patch brings back the old behavior of max_sane_readahead()
> 
> Yeah no.
> 
> There was a reason that code was killed. No way in hell are we
> bringing back the insanities with node memory etc.
>

Would you consider bringing it back, but instead of node memory state,
utilizing global memory state instead?
 
> Also, we have never actually heard of anything sane that actualyl
> depended on this. Last time this came up it was a made-up benchmark,
> not an actual real load that cared.
> 
> Who can possibly care about this in real life?
> 
People filing bugs complaining their applications that memory map files
are getting hurt by it.

-- Rafael
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