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nitpicker: alloc initial slab block in session

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This patch saves two sliced-heap allocations per session.

Issue #5340
This commit is contained in:
Norman Feske 2024-09-04 16:13:40 +02:00
parent e8e499ae9e
commit 240b631512
1 changed files with 13 additions and 2 deletions
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15
repos/os/src/server/nitpicker/gui_session.h
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@ -132,9 +132,20 @@ class Nitpicker::Gui_session : public Session_object<Gui::Session>,
List<Session_view_list_elem> _view_list { };
Tslab<View, 4000> _view_alloc { &_session_alloc };
/*
* Slab allocator that includes an initial block as member
*/
template <size_t BLOCK_SIZE>
struct Initial_slab_block { uint8_t buf[BLOCK_SIZE]; };
template <typename T, size_t BLOCK_SIZE>
struct Slab : private Initial_slab_block<BLOCK_SIZE>, Tslab<T, BLOCK_SIZE>
{
Slab(Allocator &block_alloc)
: Tslab<T, BLOCK_SIZE>(block_alloc, Initial_slab_block<BLOCK_SIZE>::buf) { };
};
Tslab<View_ref, 4000> _view_ref_alloc { &_session_alloc };
Slab<View, 4000> _view_alloc { _session_alloc };
Slab<View_ref, 4000> _view_ref_alloc { _session_alloc };
bool const _provides_default_bg;