PS-10595 [8.4]: Add innodb_large_page_populate to control huge page pre-population#6036
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…re-population https://perconadev.atlassian.net/browse/PS-10595 Introduce a new InnoDB boolean system variable innodb_large_page_populate (Linux only) that controls whether huge pages and page-aligned allocations used by the buffer pool and the page allocator are pre-populated at allocation time. When OFF (default), large_page_aligned_alloc() and page_aligned_alloc() skip MAP_POPULATE and the explicit prefault step by masking the caller's populate request with the global flag. This reduces startup time and NUMA-related overhead on large systems with huge pages. When ON, the previous behavior (honor the caller's populate request) is preserved. The backing global is named srv_large_page_populate, following the srv_ naming convention used by other InnoDB globals. On non-Linux platforms the flag is a compile-time constant true, so behavior there is unchanged.
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https://perconadev.atlassian.net/browse/PS-10595
This patch is a contribution from Alexey Bychko abychko@gmail.com.
Introduce a new InnoDB boolean system variable
innodb_large_page_populate(Linux only) that controls whether huge pages and page-aligned allocations
used by the buffer pool and the page allocator are pre-populated at allocation
time.
When OFF (default),
large_page_aligned_alloc()andpage_aligned_alloc()skip
MAP_POPULATEand the explicit prefault step by masking the caller'spopulate request with the global flag. This reduces startup time and
NUMA-related overhead on large systems with huge pages. When ON, the previous
behavior (honor the caller's populate request) is preserved.
The backing global is named
srv_large_page_populate, following thesrv_naming convention used by other InnoDB globals. On non-Linux platforms the flag
is a compile-time constant
true, so behavior there is unchanged.