linux-kernel - Re: [RFC PATCH v4 16/40] mm: Introduce a "Region Allocator" to manage entire memory regions

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Message-ID: <20131023101012.GB2043@cmpxchg.org>
Date:	Wed, 23 Oct 2013 11:10:12 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, dave@...1.net,
	tony.luck@...el.com, matthew.garrett@...ula.com, riel@...hat.com,
	arjan@...ux.intel.com, srinivas.pandruvada@...ux.intel.com,
	willy@...ux.intel.com, kamezawa.hiroyu@...fujitsu.com,
	lenb@...nel.org, rjw@...k.pl, gargankita@...il.com,
	paulmck@...ux.vnet.ibm.com, svaidy@...ux.vnet.ibm.com,
	andi@...stfloor.org, isimatu.yasuaki@...fujitsu.com,
	santosh.shilimkar@...com, kosaki.motohiro@...il.com,
	linux-pm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 16/40] mm: Introduce a "Region Allocator" to
 manage entire memory regions

On Thu, Sep 26, 2013 at 04:47:34AM +0530, Srivatsa S. Bhat wrote:
> Today, the MM subsystem uses the buddy 'Page Allocator' to manage memory
> at a 'page' granularity. But this allocator has no notion of the physical
> topology of the underlying memory hardware, and hence it is hard to
> influence memory allocation decisions keeping the platform constraints
> in mind.

This is no longer true after patches 1-15 introduce regions and have
the allocator try to stay within the lowest possible region (patch
15).  Which leaves the question what the following patches are for.

This patch only adds a data structure and I gave up finding where
among the helpers, statistics, and optimization patches an actual
implementation is.

Again, please try to make every single a patch a complete logical
change to the code base.
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