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ealanos: Don't use Hoitaja's CPU core for cells, because else the a cell's strict performance isolation would be violated by sharing a CPU core with Hoitaja.

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Michael Mueller
2025-12-09 19:57:34 +01:00
parent 17befa5c44
commit 95fb98d280
1 changed files with 18 additions and 4 deletions
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22
repos/ealanos/src/lib/sandbox/core_allocator.h
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@@ -79,8 +79,15 @@ class Hoitaja::Core_allocator
Genode::log("Resource coefficient: ", _resource_coeff); Genode::log("Resource coefficient: ", _resource_coeff);
unsigned int cores_share = _calculate_resource_share(priority); unsigned int cores_share = _calculate_resource_share(priority);
unsigned int xpos = _cores_for_cells - cores_share;
if (xpos <= 0) {
xpos = 1;
cores_share -= 1;
}
return Genode::Affinity::Location( _cores_for_cells-cores_share, 0, cores_share, 1 ); /* always use the core_share last cores, for now */ return Genode::Affinity::Location( xpos, 0, cores_share, 1 ); /* always use the core_share last cores, for now */
} }
void free_cores_from_cell(::Sandbox::Child &cell) void free_cores_from_cell(::Sandbox::Child &cell)
@@ -116,10 +123,17 @@ class Hoitaja::Core_allocator
if (*xpos - static_cast<int>(cores_share) <= *lower_limit) { if (*xpos - static_cast<int>(cores_share) <= *lower_limit) {
cores_share-= *lower_limit; // Save one core for Hoitaja cores_share-= *lower_limit; // Save one core for Hoitaja
} }
Genode::Affinity::Location location(*xpos - cores_share, resources.affinity.location().ypos(), cores_share, resources.affinity.location().height()); unsigned int new_xpos = *xpos - cores_share;
if (!new_xpos) {
new_xpos = 1;
cores_share -= 1;
}
Genode::Affinity::Location location(new_xpos, resources.affinity.location().ypos(), cores_share, resources.affinity.location().height());
Genode::log(cell.name(), ": ", location);
/*if (resources.affinity.location() != location) { // Only update, if location has actually changed /*if (resources.affinity.location() != location) { // Only update, if location has actually changed
cell.update_affinity(Genode::Affinity(resources.affinity.space(), location)); cell.update_affinity(Genode::Affinity(resources.affinity.space(), location));
} }