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Implement opt.cache_oblivious.

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Keep config.cache_oblivious for now to remain backward-compatible.
This commit is contained in:
Qi Wang
2021-02-09 22:24:35 -08:00
committed by Qi Wang
parent 8c5e5f50a2
commit a11be50332
12 changed files with 53 additions and 27 deletions
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14
INSTALL.md
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@@ -185,13 +185,13 @@ any of the following arguments (not a definitive list) to 'configure':
* `--disable-cache-oblivious`
Disable cache-oblivious large allocation alignment for large allocation
requests with no alignment constraints. If this feature is disabled, all
large allocations are page-aligned as an implementation artifact, which can
severely harm CPU cache utilization. However, the cache-oblivious layout
comes at the cost of one extra page per large allocation, which in the
most extreme case increases physical memory usage for the 16 KiB size class
to 20 KiB.
Disable cache-oblivious large allocation alignment by default, for large
allocation requests with no alignment constraints. If this feature is
disabled, all large allocations are page-aligned as an implementation
artifact, which can severely harm CPU cache utilization. However, the
cache-oblivious layout comes at the cost of one extra page per large
allocation, which in the most extreme case increases physical memory usage
for the 16 KiB size class to 20 KiB.
* `--disable-syscall`