diff options
Diffstat (limited to 'mongodb-4.4.15-adjust-cache-alignment-assumptions.patch')
| -rw-r--r-- | mongodb-4.4.15-adjust-cache-alignment-assumptions.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/mongodb-4.4.15-adjust-cache-alignment-assumptions.patch b/mongodb-4.4.15-adjust-cache-alignment-assumptions.patch new file mode 100644 index 000000000000..27c4a2da4d4a --- /dev/null +++ b/mongodb-4.4.15-adjust-cache-alignment-assumptions.patch @@ -0,0 +1,37 @@ +From 5c9e0d0fc9188bab0ae09c9c33df01938b0c1b6c Mon Sep 17 00:00:00 2001 +From: Khem Raj <raj.khem@gmail.com> +Date: Thu, 14 Apr 2022 09:25:33 -0700 +Subject: [PATCH] server: Adjust the cache alignment assumptions + +aarch64 has 256 for hardware_destructive_interference_size and gcc 12 +has added a warning to complain about mismatches which results in +static_assert failures + +In file included from src/mongo/s/commands/cluster_find_cmd.cpp:39: +src/mongo/db/stats/counters.h:185:47: error: static assertion failed: cache line spill + 185 | static_assert(sizeof(decltype(_together)) <= stdx::hardware_constructive_interference_size, + | ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The structure need to ensure true sharing for both the elements +so align it to hardware_constructive_interference_size instead + +Upstream-Status: Reported [https://jira.mongodb.org/browse/SERVER-65664] + +Signed-off-by: Khem Raj <raj.khem@gmail.com> +--- + src/mongo/db/stats/counters.h | 6 +++--- + 1 file changed, 3 insertions(+), 3 deletions(-) + +--- a/src/mongo/db/stats/counters.h ++++ b/src/mongo/db/stats/counters.h +@@ -182,8 +182,8 @@ private: + AtomicWord<long long> requests{0}; + }; + CacheAligned<Together> _together{}; +- static_assert(sizeof(decltype(_together)) <= stdx::hardware_constructive_interference_size, +- "cache line spill"); ++ static_assert(sizeof(Together) <= stdx::hardware_constructive_interference_size, ++ "cache line spill"); + + CacheAligned<AtomicWord<long long>> _logicalBytesOut{0}; + |