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The new 'Env::try_session' method mirrors the existing 'Env::session' without implicitly handling exceptions of the types 'Out_of_ram', 'Out_of_caps', 'Insufficient_ram_quota', and 'Insufficient_cap_quota'. It enables runtime environments like init to reflect those exceptions to their children instead of paying the costs of implicit session-quota upgrades out of the own pocket. By changing the 'Parent_service' to use 'try_session', this patch fixes a resource-exhaustion problem of init in Sculpt OS that occurred when the GPU multiplexer created a large batch of IO_MEM sessions, with each session requiring a second attempt with the session quota upgraded by 4 KiB. Issue #3767
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together. _Core_ may export information about the hardware platform by an ROM called 'platform_info'. Depending on the platform, e.g. ARM or x86 or riscv, and depending on the boot mode and boot loader and kernel, some nodes may not be populated. !<platform_info> ! <acpi revision="2" rsdt="0x1fe93074" xsdt="0x1fe930e8"/> ! <boot> ! <framebuffer phys="0x7300000" width="1024" height="768" bpp="32"/> ! </boot> !</platform_info> If the ACPI RSDT and XSDT physical pointer is reported by the used kernel and/or bootloader, _Core_ may provide this information by the ROM. If the graphic device is initialised and can be directly used by a framebuffer driver, _Core_ may provide the physical pointer to the framebuffer, the resolution and color depth in bits.