STRUCT CMBE(9)

✨ NAME ✨

okay bestie, welcome to struct cmbe(9) from the Kernel API Manual — it’s the extended channel measurement block, and it’s giving “small struct, big hardware energy.” 💅

🎀 SYNOPSIS 🎀

       struct cmbe {
           u32 ssch_rsch_count;
           u32 sample_count;
           u32 device_connect_time;
           u32 function_pending_time;
           u32 device_disconnect_time;
           u32 control_unit_queuing_time;
           u32 device_active_only_time;
           u32 device_busy_time;
           u32 initial_command_response_time;
           u32 reserved[7];
        };

🧸 Members 🧸

• ssch_rsch_count — number of ssch and rsch ✨
• sample_count — number of samples 🎀
• device_connect_time — time of device connect 🔥
• function_pending_time — time of function pending ⭐
• device_disconnect_time — time of device disconnect 🦋
• control_unit_queuing_time — time of control unit queuing 💫
• device_active_only_time — time of device active only 🌸
• device_busy_time — time of device busy 💀
• initial_command_response_time — initial command response time 👑
• reserved — unused 🙈

🌸 Description 🌸

The measurement block as used by the hardware. May be in any 64 bit physical location. The fields are described further in z/Architecture Principles of Operation, third edition, chapter 17. 🫶

💜 SEE ALSO 💜

go peek at Kernel file ./drivers/s390/cio/cmf.c — and then these icons: enum cmb_format(9), struct cmb_operations(9), struct cmb_area(9), struct cmb(9), enable_cmf(9), __disable_cmf(9), disable_cmf(9), cmf_read(9), cmf_readall(9), cmf_reactivate(9). 🌈

mwah 💋 this page’s source/version is ./drivers/s390/cio, dated October 2026, and yes, struct cmbe(9) is still the title — periodt. 🎀