Changed-lines coverage:
  PR changed C/C++ lines covered by tests: 41.67% (10/24)

Uncovered changed code (with context):

================================================================================
programs/server/Server.cpp
================================================================================

--- uncovered block 866-878 ---
      864 | 
      865 |     if (!PerCPU::haveRSeq())
>>    866 |         server.context()->addOrUpdateWarningMessage(
>>    867 |             Context::WarningType::LINUX_RSEQ_UNAVAILABLE,
>>    868 |             PreformattedMessage::create(
>>    869 |                 "The Linux 'restartable sequences' (rseq) feature is not enabled for this process. "
>>    870 |                 "ClickHouse uses it to cheaply detect which CPU core a thread is running on, which keeps "
>>    871 |                 "per-CPU performance counters (used for internal profiling and statistics) fast to update. "
>>    872 |                 "Without it, a slower fallback is used (a real system call on some platforms, such as AArch64), "
>>    873 |                 "making these counters more expensive and slightly degrading performance. "
>>    874 |                 "This means the runtime C library or the kernel did not register a usable rseq area for this process. "
>>    875 |                 "Possible causes: the kernel does not support rseq (it was introduced in Linux 4.18); "
>>    876 |                 "the C library does not register it (glibc does so automatically since version 2.35, so upgrading glibc may help; "
>>    877 |                 "other libraries, such as musl, do not register it); "
>>    878 |                 "or registration was disabled or failed at startup (with glibc, see the 'glibc.pthread.rseq' tunable)."));
      879 | 
      880 |     try
================================================================================
src/Common/PerCPU.cpp
================================================================================

--- uncovered block 49-49 ---
       47 |     /// The registered area must cover at least the `cpu_id` field (offset 4, size 4).
       48 |     if (&__rseq_size == nullptr || __rseq_size < 8)
>>     49 |         return false;
       50 |     /// The kernel uses negative sentinels in `cpu_id`: -1 (UNINITIALIZED) and -2
       51 |     /// (REGISTRATION_FAILED). The production `sched_getcpu`
WARNING: Failed to get start time for [Print Uncovered Code] - start time and duration won't be set

--- Coverage counts ---
Lines     : baseline 913,753/1,059,546  ->  current 913,775/1,059,568  (delta +22 / +22)
Functions : baseline 800,348/870,004  ->  current 800,520/870,006  (delta +172 / +2)
Branches  : baseline 295,445/377,022  ->  current 295,484/377,028  (delta +39 / +6)