On Mon, 10 Sep 2012, Jan Stancek wrote: > This testcase failed on some setups (ppc64): > Starting testcase "./obj64/mremap-expand-slice-collision", pid 10840 > do_readback(0x20001000000, 0x1000000, "huge above") > do_readback(0x1ffffff0000, 0x10000, "normal below") > Attempting to remap...disallowed > do_readback(0x20001000000, 0x10000, "normal above") > FAIL mmap(huge below): Device or resource busy > > Problem is that SLICE_BOUNDARY was hardcoded to 0x20000000000. > When testcase tries to mmap huge page below this address (0x1ffff000000), > it fails with EBUSY because there is already heap (0x1????000000) > at this slice which may not be using huge pages. > > See also kernel commit. which introduced slices on powerpc: > commit d0f13e3c20b6fb73ccb467bdca97fa7cf5a574cd > Author: Benjamin Herrenschmidt <b...@kernel.crashing.org> > Date: Tue May 8 16:27:27 2007 +1000 > [POWERPC] Introduce address space "slices" > > This patch removes hardcoded SLICE_BOUNDARY address and introduces > function to find two free neighbour slices at runtime. Slice boundary > is then set to address between these slices. > > With patch: > Starting testcase "./obj64/mremap-expand-slice-collision", pid 12768 > can't use slice_boundary: 0x20000000000 > using slice_boundary: 0x30000000000 > do_readback(0x30001000000, 0x1000000, "huge above") > do_readback(0x2ffffff0000, 0x10000, "normal below") > Attempting to remap...disallowed > do_readback(0x30001000000, 0x10000, "normal above") > do_readback(0x2ffff000000, 0x1000000, "huge below") > Attempting to remap...disallowed > PASS > > Signed-off-by: Jan Stancek <jstan...@redhat.com>
Applied, thanks. Eric
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