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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2023-08-11 18:48:18 -0500 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2023-09-11 22:48:44 -0500 |
| commit | 402324a71073ac36d334845a71a5f97350aebbc3 (patch) | |
| tree | c38e649eb6db5305599e2a00761bc13688fdeb0d | |
| parent | ba37e6a4d17ad7a3871542953d9ebaf60034a76e (diff) | |
| download | glibc-402324a71073ac36d334845a71a5f97350aebbc3.tar glibc-402324a71073ac36d334845a71a5f97350aebbc3.tar.gz glibc-402324a71073ac36d334845a71a5f97350aebbc3.tar.bz2 glibc-402324a71073ac36d334845a71a5f97350aebbc3.zip | |
x86: Fix slight bug in `shared_per_thread` cache size calculation.
After:
```
commit af992e7abdc9049714da76cae1e5e18bc4838fb8
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Wed Jun 7 13:18:01 2023 -0500
x86: Increase `non_temporal_threshold` to roughly `sizeof_L3 / 4`
```
Split `shared` (cumulative cache size) from `shared_per_thread` (cache
size per socket), the `shared_per_thread` *can* be slightly off from
the previous calculation.
Previously we added `core` even if `threads_l2` was invalid, and only
used `threads_l2` to divide `core` if it was present. The changed
version only included `core` if `threads_l2` was valid.
This change restores the old behavior if `threads_l2` is invalid by
adding the entire value of `core`.
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit 47f747217811db35854ea06741be3685e8bbd44d)
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/x86/cacheinfo.c b/sysdeps/x86/cacheinfo.c index 4354c01c71..6baec4d7ed 100644 --- a/sysdeps/x86/cacheinfo.c +++ b/sysdeps/x86/cacheinfo.c @@ -696,8 +696,8 @@ init_cacheinfo (void) /* Account for non-inclusive L2 and L3 caches. */ if (!inclusive_cache) { - if (threads_l2 > 0) - shared_per_thread += core / threads_l2; + long int core_per_thread = threads_l2 > 0 ? (core / threads_l2) : core; + shared_per_thread += core_per_thread; shared += core; } } |