Kenneth Graunke
d85d6ad2a5
With the introduction of the slab allocator, most of our small
allocations now hit that rather than directly hitting the bucket
cache. Those now show up as 2MB slab allocations from the cache's
perspective. So, we don't need quite as many buckets. (Note that
only allocations in IRIS_MEMZONE_OTHER are suballocated today.)
Previously, we had 55 buckets, going from 4KB to 112MB, with sizes
N, N+1/4, N+1/2, N+3/4 for a series of power-of-two N's.
This patch prunes it down to 25 buckets:
- 4K-4MB => power-of-two sizes only
- 6MB => a one-off bucket to reduce waste between 4MB and 8MB
- 8MB+ => the usual N, N+1/4, N+1/2, N+3/4 system
- 64MB => the largest bucket size
In particular, this eliminates the 1.75MB, 2.5MB, 3MB, 3.5MB, and 7MB
buckets in favor of multiples of 2MB. Allocating multiples of 2MB is
preferable because it allows the kernel to allocate 64KB pages rather
than being stuck using inefficient 4K pages. And, the amount of waste
from bumping to the next multiple of 2MB isn't huge in that range of
sizes. We also eliminate buckets larger than 64MB because they're
rarely used, and also the amount of waste from rounding up to the
80/96/112MB buckets can get pretty large.
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Fixes: 0b6693a3a1 ("iris: Align fresh BO allocations to 2MB in size")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10219
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32635>
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