Hello , As discussed in this[1] discussion, i am reserving a memory chunk at the boot time using a kernel boot parameter memmap=8G$64G I have written a character driver [2] kernel module which , during initialization does a ioremap of this reserved memory chunk. As explained here , in my driver mmap all i need to do is remap_pfn_range for this memory chunk pointer returned by the ioremap. I am running this on 3.x linux kernel. My user space application opens this memory chunk as a device mounted by the driver. When i do mmap from the use space application i see a system hang. my dmesg don't provide me much information. So questions are : 1 ) Does remap_pfn_range function have some upper limit on the size of the memory that can be remaped to ? Note that i am trying to reserve a comparatively large chunks of memory at the boot time of the order of 64GB to about 150GB. The system can have 128 to 256 GB of ram. 2) I tried by disabling the ioremap from the initialization and thus directly doing the page frame numbers remapping in the mmap ioctl routing. But that also results in a hang. 3) I tried with a page-fault handler , but that doesn't seem to help either. Regards, -Jay P.S. code can be found here [4] [1] http:// stackoverflow.com/q/1911473/143897 [2] http:// pete.akeo.ie/2011/08/writing-linux-device-driver-for-kernels.html [3] http:// www. linuxquestions.org/questions/linux-kernel-70/mmap-of-several-gb-of-reserved-memory-using-805818/#post3972954 [4] http:// stackoverflow.com/questions/12790382/mapping-memory-reserved-by-mmap-kernel-boot-param-into-user-space -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
