X-Spam-Check-By: sourceware.org Date: Tue, 16 Jan 2007 17:28:20 -0600 From: Brian Ford Reply-To: cygwin@cygwin.com To: cygwin@cygwin.com Subject: Re: 1.7.0 CVS mmap failure In-Reply-To: Message-ID: References: <20070105095752.GB28768@calimero.vinschen.de> <20070105182234.GC12776@calimero.vinschen.de> <20070105192302.GD12776@calimero.vinschen.de> <20070110095345.GL23638@calimero.vinschen.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Wed, 10 Jan 2007, Brian Ford wrote: > On Wed, 10 Jan 2007, Corinna Vinschen wrote: > > > I implemented the above mentioned technique, which isn't much code > > anyway. It reserves a memory lot big enough to fit in the whole > > mapping, memorizes the address, free's the memory again and then uses > > the new address in the subsequent real mappings. > > > > This should work (knock on wood) on all systems now. My testcases still > > work on my 512 MB machine, so I'd appreciate if you could give the latest > > snapshot a try on /3GB enabled machines. > > Yes, this fixes my STC and the application from which it was derived. > Thanks. But, it breaks another application that supplies a suggested mmap address (not MAP_FIXED) that is not available. The VirtualAlloc needs a retry in that case. Maybe the retries can then be removed from the other two locations? I'd try a patch, but I'm afraid I'd not catch all the cases correctly. Let me know if you'd prefer I try anyway. Thanks. PS: In an strace of this, I see three fstat64s called from within a single mmap64. Do you know where they all are, and if two should be optimized away? -- Brian Ford Lead Realtime Software Engineer VITAL - Visual Simulation Systems FlightSafety International the best safety device in any aircraft is a well-trained crew... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/