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49 lines
1.7 KiB
49 lines
1.7 KiB
From 47f747217811db35854ea06741be3685e8bbd44d Mon Sep 17 00:00:00 2001 |
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From: Noah Goldstein <goldstein.w.n@gmail.com> |
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Date: Mon, 17 Jul 2023 23:14:33 -0500 |
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Subject: [PATCH] x86: Fix slight bug in `shared_per_thread` cache size |
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calculation. |
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Content-type: text/plain; charset=UTF-8 |
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After: |
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``` |
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commit af992e7abdc9049714da76cae1e5e18bc4838fb8 |
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Author: Noah Goldstein <goldstein.w.n@gmail.com> |
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Date: Wed Jun 7 13:18:01 2023 -0500 |
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x86: Increase `non_temporal_threshold` to roughly `sizeof_L3 / 4` |
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``` |
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Split `shared` (cumulative cache size) from `shared_per_thread` (cache |
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size per socket), the `shared_per_thread` *can* be slightly off from |
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the previous calculation. |
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Previously we added `core` even if `threads_l2` was invalid, and only |
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used `threads_l2` to divide `core` if it was present. The changed |
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version only included `core` if `threads_l2` was valid. |
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This change restores the old behavior if `threads_l2` is invalid by |
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adding the entire value of `core`. |
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Reviewed-by: DJ Delorie <dj@redhat.com> |
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--- |
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sysdeps/x86/dl-cacheinfo.h | 4 ++-- |
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1 file changed, 2 insertions(+), 2 deletions(-) |
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diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h |
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index c98fa57a7b..43be2c1229 100644 |
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--- a/sysdeps/x86/dl-cacheinfo.h |
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+++ b/sysdeps/x86/dl-cacheinfo.h |
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@@ -614,8 +614,8 @@ get_common_cache_info (long int *shared_ptr, long int * shared_per_thread_ptr, u |
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/* Account for non-inclusive L2 and L3 caches. */ |
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if (!inclusive_cache) |
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{ |
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- if (threads_l2 > 0) |
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- shared_per_thread += core / threads_l2; |
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+ long int core_per_thread = threads_l2 > 0 ? (core / threads_l2) : core; |
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+ shared_per_thread += core_per_thread; |
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shared += core; |
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} |
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-- |
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2.39.3 |
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