From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 12 May 2005 09:07:36 +0200 From: Ingo Molnar Subject: Re: [PATCH] Avoiding mmap fragmentation (against 2.6.12-rc4) to Message-ID: <20050512070736.GA15494@elte.hu> References: <20050510115818.0828f5d1.akpm@osdl.org> <200505101934.j4AJYfg26483@unix-os.sc.intel.com> <20050510124357.2a7d2f9b.akpm@osdl.org> <17025.4213.255704.748374@gargle.gargle.HOWL> <20050510125747.65b83b4c.akpm@osdl.org> <17026.6227.225173.588629@gargle.gargle.HOWL> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <17026.6227.225173.588629@gargle.gargle.HOWL> Sender: owner-linux-mm@kvack.org Return-Path: To: Wolfgang Wander Cc: Andrew Morton , kenneth.w.chen@intel.com, arjanv@redhat.com, linux-mm@kvack.org List-ID: * Wolfgang Wander wrote: > The patch below is against linux-2.6.12-rc4. > > Ingo recently introduced a great speedup for allocating new mmaps > using the free_area_cache pointer which boosts the specweb SSL > benchmark by 4-5% and causes huge performance increases in thread > creation. small correction: 'recently' was more than 2.5 years ago (!). So this issue is something that hits certain rare workloads. Note that the mmap speedup was also backported to 2.4 so it is quite widely deployed. This is the first time anyone complained. Ingo -- 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: aart@kvack.org