linux-kernel - Re: [PATCH -mm v2 00/11] mm: scalable and unified arch_get_unmapped

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Message-ID: <20452.32826.165122.958868@quad.stoffel.home>
Date:	Fri, 22 Jun 2012 10:24:58 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Rik van Riel <riel@...riel.com>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, aarcange@...hat.com,
	peterz@...radead.org, minchan@...il.com, kosaki.motohiro@...il.com,
	andi@...stfloor.org, hannes@...xchg.org, mel@....ul.ie,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm v2 00/11] mm: scalable and unified arch_get_unmapped_area

>>>>> "Rik" == Rik van Riel <riel@...riel.com> writes:

Rik> A long time ago, we decided to limit the number of VMAs per
Rik> process to 64k. As it turns out, there actually are programs
Rik> using tens of thousands of VMAs.

Rik> Performance

Rik> Testing performance with a benchmark that allocates tens
Rik> of thousands of VMAs, unmaps them and mmaps them some more
Rik> in a loop, shows promising results.

How are the numbers for applications which only map a few VMAs?  Is
there any impact there?

John
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