linux-kernel - Re: [PATCH 14/38] Remove struct mm_struct::exe

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Date:	Sun, 31 May 2009 16:15:50 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Matt Helsley <matthltc@...ibm.com>, xemul@...allels.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, dave@...ux.vnet.ibm.com,
	mingo@...e.hu
Subject: Re: [PATCH 14/38] Remove struct mm_struct::exe_file et al

On Sun, 31 May 2009, Andrew Morton wrote:
> 
> What I always find a bit weird is that an MM container is used as the
> central point for a number of sched obects.  But it's logical, given
> that the never-before-stated definition of a heavyweight process is
> "thing which share a VM".

It has nothing to do with "heavy-weight process" or anything else.

The thing is, from a scheduling standpoint, one of the primary performance 
concerns in the TLB switch.

And there's a 1:1 relationship between TLB switch and MM container, modulo 
the issue of kernel tasks (and those obviously "borrow" approproate MM 
structs to avoid the switch).

So it's not weird at all. It's very direct, and a very straightforward and 
obvious relationship.

			Linus
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