Messages in this thread | | | Date | Wed, 16 Mar 2011 22:54:51 -0700 (PDT) | From | Kenny Simpson <> | Subject | remap_file_pages doesn't like MAP_ANONYMOUS (but used to?) |
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Hello, In older kernels (2.6.15-2.6.18?) I was able to make an anonymous mapping and remap part of it back over itself to create a circular buffer: p = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0) remap_file_pages(p + sz/2, sz/2, 0/*prot*/, 0/*offset*/, 0/*flags*/)
I find the same method fails with EINVAL on the remap_file_pages call in 2.6.35/38. Making a dummy file or shared memory object works, but seems a bit more messy.
Why drop support for ANONYMOUS? Is there another way to get the same effect?
thanks, -Kenny
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