From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx149.postini.com [74.125.245.149]) by kanga.kvack.org (Postfix) with SMTP id 6B2296B0032 for ; Tue, 23 Jul 2013 04:20:44 -0400 (EDT) Received: by mail-ee0-f41.google.com with SMTP id d51so53433eek.0 for ; Tue, 23 Jul 2013 01:20:42 -0700 (PDT) Date: Tue, 23 Jul 2013 10:20:39 +0200 From: Ingo Molnar Subject: Re: [RFC 0/4] Transparent on-demand struct page initialization embedded in the buddy allocator Message-ID: <20130723082039.GD16088@gmail.com> References: <1373594635-131067-1-git-send-email-holt@sgi.com> <20130712082756.GA4328@gmail.com> <20130716085502.GA31276@lge.com> <20130716090805.GC4402@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130716090805.GC4402@pd.tnic> Sender: owner-linux-mm@kvack.org List-ID: To: Borislav Petkov Cc: Joonsoo Kim , Robin Holt , Robert Richter , "H. Peter Anvin" , Nate Zimmer , Linux Kernel , Linux MM , Rob Landley , Mike Travis , Daniel J Blueman , Andrew Morton , Greg KH , Yinghai Lu , Mel Gorman , Peter Zijlstra * Borislav Petkov wrote: > On Tue, Jul 16, 2013 at 05:55:02PM +0900, Joonsoo Kim wrote: > > How about executing a perf in usermodehelper and collecting output > > in tmpfs? Using this approach, we can start a perf after rootfs > > initialization, > > What for if we can start logging to buffers much earlier? *Reading* > from those buffers can be done much later, at our own leisure with full > userspace up. Yeah, agreed, I think this needs to be more integrated into the kernel, so that people don't have to worry about "when does userspace start up the earliest" details. Fundamentally all perf really needs here is some memory to initialize and buffer into. Thanks, 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: email@kvack.org