Probably doesn't fix anything but those should be accessed in an
atomic way just like the head pointer.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: e4f01eca3b ("util: Add a free list structure for use with util_sparse_array")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4613>
By temporarily storing the new_head by a uint32_t, we wipe out the
counter section of the head pointer.
Fixes: e4f01eca ("util: Add a free list structure for use with util_sparse_array")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4612>
This reworks the data structure a bit and, in my view, simplifies it.
Instead of each node having a header which has the node level in it, we
use the bottom 6 bits of the pointer for that. This requires us to
allocate with the os_malloc/free_aligned helpers (which call into
posix_memalign on Linux) but cache-line aligning our allocations is
actually probably a good thing given that we're doing atomics on them.
The primary advantages to doing this is that it changes the number of
memory accesses per tree level from 2 to 1 when walking the tree because
we no longer have to look at node->level.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4228>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4228>
We use this value several times. It's probably best to encourage the
compiler to only read it once. I have no proof that this actually makes
any performance improvement whatsoever.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4228>
Lionel Landwerlin
D Scott Phillips
Jason Ekstrand