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issue: 3884801 Check for resident hugepages to avoid SIGBUS #204

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issue: 3884801 Check for resident hugepages to avoid SIGBUS #204

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Commits on Nov 11, 2024

  1. issue: 3884801 Check for resident hugepages to avoid SIGBUS 

    In a containerized environment mmap() beyond the hugepages limit can be
successful, but a further memory access triggers SIGBUS and terminates
the process. Check that all the allocated hugepages are resident with
mincore() to avoid the SIGBUS issue.

Cost of the feature depends on the allocation size and hugepage size:
 - 32GB with 2MB pages takes 4400 us
 - 32GB with 1GB pages takes 11 us
 - 32MB with 2MB pages takes 5-6 us

We expect a big memory preallocation at the start (2GB by default) and
rare 32MB allocations during warmup period. Therefore, this feature can
add several additional 5us latency spikes during warmup period.

Signed-off-by: Dmytro Podgornyi <[email protected]>
    @pasis
    pasis committed Nov 11, 2024
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  2. issue: 3884801 Add XLIO_QUICK_START parameter 

    The parameter disables the check for resident hugepages. The check can
be expensive and, on the other hand, can be irrelevant based on the
system configuration. Therefore, disabling it reduces the initialization
time which can be crucial in some scenarios.

The name for the parameter is chosen to extend the idea of reducing
initialization time in the future.

Signed-off-by: Dmytro Podgornyi <[email protected]>
    @pasis
    pasis committed Nov 11, 2024
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