From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx110.postini.com [74.125.245.110]) by kanga.kvack.org (Postfix) with SMTP id 121DA6B007E for ; Thu, 23 Feb 2012 16:57:39 -0500 (EST) From: Andi Kleen Subject: Re: [PATCH -mm 2/2] mm: do not reset mm->free_area_cache on every single munmap References: <20120223145417.261225fd@cuia.bos.redhat.com> <20120223150034.2c757b3a@cuia.bos.redhat.com> Date: Thu, 23 Feb 2012 13:57:42 -0800 In-Reply-To: <20120223150034.2c757b3a@cuia.bos.redhat.com> (Rik van Riel's message of "Thu, 23 Feb 2012 15:00:34 -0500") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org List-ID: To: Rik van Riel Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Mel Gorman , Johannes Weiner , KOSAKI Motohiro , Andrea Arcangeli , hughd@google.com Rik van Riel writes: > Some programs have a large number of VMAs, and make frequent calls > to mmap and munmap. Having munmap constantly cause the search > pointer for get_unmapped_area to get reset can cause a significant > slowdown for such programs. This would be a much nicer patch if you split it into one that merges all the copy'n'paste code and another one that actually implements the new algorithm. -Andi -- ak@linux.intel.com -- Speaking for myself only -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org