Messages in this thread | | | Date | Wed, 16 Jul 2014 03:08:31 -0700 (PDT) | From | Hugh Dickins <> | Subject | Re: [PATCH v3 5/7] selftests: add memfd/sealing page-pinning tests |
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On Fri, 13 Jun 2014, David Herrmann wrote:
> Setting SEAL_WRITE is not possible if there're pending GUP users. This > commit adds selftests for memfd+sealing that use FUSE to create pending > page-references. FUSE is very helpful here in that it allows us to delay > direct-IO operations for an arbitrary amount of time. This way, we can > force the kernel to pin pages and then run our normal selftests. > > Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
I had a number of problems in getting this working (on openSUSE 13.1): rpm told me I had fuse installed, yet I had to download and install the tarball to get header files needed; then "make fuse_mnt" told me to add -D_FILE_OFFSET_BITS=64 to the compile flags; after which I got "undefined reference to `fuse_main_real'"; but then I tried "make run_fuse" as root, and it seemed to sort these issues out for itself, aside from "./run_fuse_test.sh: Permission denied" - which was within my bounds of comprehension unlike the rest!
No complaint, thanks for providing the test (though I didn't check the source to convince myself that "DONE" has done what's claimed): some rainy day someone can get the Makefile working more smoothly, no need to delay the patchset for this.
Hugh
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