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base: Try to increase range when allocating from specific NUMA region fails.

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This commit is contained in:
Michael Mueller
2025-05-11 22:04:08 +02:00
parent 225396c805
commit b0e46febfb
1 changed files with 24 additions and 0 deletions
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24
repos/base/src/core/ram_dataspace_factory.cc
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@@ -165,6 +165,30 @@ Ram_dataspace_factory::try_alloc(size_t ds_size, Cache cache, Range_allocator::R
break; break;
} }
/*
* If no physical constraint exists or constraints failed, try to allocate
* physical memory at high locations (3G for 32-bit / 4G for 64-bit platforms)
* in order to preserve lower physical regions for device drivers, which may
* have DMA constraints.
*/
if (!allocated_range.ok()) {
addr_t const high_start = (sizeof(void *) == 4 ? 3UL : 4UL) << 30;
Phys_range const range{.start = high_start, .end = ~0UL};
for (size_t align_log2 = log2(ds_size); align_log2 >= 12; align_log2--) {
allocated_range = _phys_alloc.alloc_aligned(ds_size, (unsigned)align_log2, range);
if (allocated_range.ok()) break;
}
}
/* retry if larger non-constrained memory allocation failed */
if (!allocated_range.ok()) {
for (size_t align_log2 = log2(ds_size); align_log2 >= 12; align_log2--) {
allocated_range = _phys_alloc.alloc_aligned(ds_size, (unsigned)align_log2, _phys_range);
if (allocated_range.ok()) break;
}
}
if (allocated_range.failed()) { if (allocated_range.failed()) {
error("out of physical memory while allocating ", ds_size, " bytes ", error("out of physical memory while allocating ", ds_size, " bytes ",
"in range [", Hex(_phys_range.start), "-", Hex(_phys_range.end), "]"); "in range [", Hex(_phys_range.start), "-", Hex(_phys_range.end), "]");