From mboxrd@z Thu Jan 1 00:00:00 1970 From: coolsandyforyou@gmail.com (sandeep kumar) Date: Wed, 1 Jun 2011 09:54:09 +0530 Subject: Can i allocate 4GB virtual addresses (more than a certain limit) using vmalloc? In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org Yes peter you r right.. But my main concern(which i dint convey properly in subject) is whether virtual memory allocation has a limit or not. I got it answered. Thank you .. On Tue, May 31, 2011 at 8:57 PM, Peter Teoh wrote: > To answer your subject: I think the straight answer is "no". Many > reason, among them: > > ARM is still 32-bit, at least at the present moment: > > http://www.google.com/search?q=does+arm+have+64bit&num=100 > > so with hardware 32-bit based, doing MMU at the 64-bit level is still > not possible (without the MMU 64-bit hardware architecture, I don't > think it is possible to do any >4GB memory translation stuff. Am I > not wrong? > > On Tue, May 31, 2011 at 1:54 PM, sandeep kumar > wrote: > > Hi all, > > The following link gives the memory map for the arm architecture. > > http://www.arm.linux.org.uk/developer/memory.txt > > > > I have the following doubts.. > > 1) Any chipset(based on arm) manufacturer(qualcom,samsung..) should > follow > > the same memory map. > > Is it hardly constrained or can be changed? > > Where are this constraints are implemented in the kernel source tree? > > > > 2) while i was student, i read in OS concepts that, "Virtual memory > gives an > > illusion to a process, > > that it has always a larger continuous address space (even more than RAM) > > available to it." > > So i thought i could allocate howmuch ever memory i want. > > But seeing the above link,i observed there is some limitation in the > address > > space created by the vmalloc(). > > So i m now thinking that vmalloc has some limit. > > > > Please make me clear these things.... > > > > > > With regards, > > Sandeep Kumar Anantapalli, > > > > _______________________________________________ > > Kernelnewbies mailing list > > Kernelnewbies at kernelnewbies.org > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > > > > > -- > Regards, > Peter Teoh > -- With regards, Sandeep Kumar Anantapalli, -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20110601/e04fafbf/attachment-0001.html