From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx122.postini.com [74.125.245.122]) by kanga.kvack.org (Postfix) with SMTP id CB55C6B017B for ; Fri, 22 Jun 2012 10:25:49 -0400 (EDT) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <20452.32826.165122.958868@quad.stoffel.home> Date: Fri, 22 Jun 2012 10:24:58 -0400 From: "John Stoffel" Subject: Re: [PATCH -mm v2 00/11] mm: scalable and unified arch_get_unmapped_area In-Reply-To: <1340315835-28571-1-git-send-email-riel@surriel.com> References: <1340315835-28571-1-git-send-email-riel@surriel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Rik van Riel Cc: linux-mm@kvack.org, akpm@linux-foundation.org, aarcange@redhat.com, peterz@infradead.org, minchan@gmail.com, kosaki.motohiro@gmail.com, andi@firstfloor.org, hannes@cmpxchg.org, mel@csn.ul.ie, linux-kernel@vger.kernel.org >>>>> "Rik" == Rik van Riel 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org