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Re: deferred rss update instead of sloppy rss

From:  Linus Torvalds <torvalds-AT-osdl.org>
To:  Christoph Lameter <clameter-AT-sgi.com>
Subject:  Re: deferred rss update instead of sloppy rss
Date:  Mon, 22 Nov 2004 14:22:30 -0800 (PST)
Cc:  Hugh Dickins <hugh-AT-veritas.com>, akpm-AT-osdl.org, Benjamin Herrenschmidt <benh-AT-kernel.crashing.org>, Nick Piggin <nickpiggin-AT-yahoo.com.au>, linux-mm-AT-kvack.org, linux-ia64-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org
Archive-link:  Article, Thread


On Mon, 22 Nov 2004, Christoph Lameter wrote:
> 
> The problem is then that the proc filesystem must do an extensive scan
> over all threads to find users of a certain mm_struct.

The alternative is to just add a simple list into the task_struct and the
head of it into mm_struct. Then, at fork, you just finish the fork() with

	list_add(p->mm_list, p->mm->thread_list);

and do the proper list_del() in exit_mm() or wherever.

You'll still loop in /proc, but you'll do the minimal loop necessary.

		Linus
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