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Per Philip Yang: For forked child process, userptr allocated on heap (through malloc) will have two vmas if child process malloc smaller size buf, free it, this is on vma cloned from parent process. Then malloc larger size buf, kernel will put some pages on previous freed space from vma cloned, create new vma for the rest of pages. This is what IPCTest does. Change-Id: I054771e20880f975d7cc774225f19aad5363843f
1. Note on building kfdtest To build this kfdtest application, the following libraries should be already installed on the building machine: libdrm libdrm_amdgpu libhsakmt If libhsakmt is not installed, but the headers and libraries are present locally, you can specify its directory by export LIBHSAKMT_PATH=/*your local libhsakmt folder*/ With that, the headers and libraries are searched under LIBHSAKMT_PATH/include and LIBHSAKMT_PATH/lib respectively. 2. How to run kfdtest Just run "./run_kfdtest.sh" under the building output folder. You may need to specify library path through: export LD_LIBRARY_PATH=/*your library path containing libhsakmt*/ Note: you can use "run_kfdtest.sh -h" to see more options.