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Jerome Forissier <jerome.forissier@linaro.org> says: This series introduces threads and uses them to improve the performance of the USB bus scanning code and to implement background jobs in the shell via two new commands: 'spawn' and 'wait'. The threading framework is called 'uthread' and is inspired from the barebox threads [2]. setjmp() and longjmp() are used to save and restore contexts, as well as a non-standard extension called initjmp(). This new function is added in several patches, one for each architecture that supports HAVE_SETJMP. A new symbol is defined: HAVE_INITJMP. Two tests, one for initjmp() and one for the uthread scheduling, are added to the lib suite. After introducing threads and making schedule() and udelay() a thread re-scheduling point, the USB stack initialization is modified to benefit from concurrency when UTHREAD is enabled, where uthreads are used in usb_init() to initialize and scan multiple busses at the same time. The code was tested on arm64 and arm QEMU with 4 simulated XHCI buses and some devices. On this platform the USB scan takes 2.2 s instead of 5.6 s. Tested on i.MX93 EVK with two USB hubs, one ethernet adapter and one webcam on each, "usb start" takes 2.4 s instead of 4.6 s. Finally, the spawn and wait commands are introduced, allowing the use of threads from the shell. Tested on the i.MX93 EVK with a spinning HDD connected to USB1 and the network connected to ENET1. The USB plus DHCP init sequence "spawn usb start; spawn dhcp; wait" takes 4.5 seconds instead of 8 seconds for "usb start; dhcp". [1] https://patchwork.ozlabs.org/project/uboot/list/?series=446674 [2] https://github.com/barebox/barebox/blob/master/common/bthread.c Link: https://lore.kernel.org/r/20250418141114.2056981-1-jerome.forissier@linaro.org |
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| .. | ||
| addrmap.c | ||
| armffa.c | ||
| bdinfo.c | ||
| command.c | ||
| coreboot.c | ||
| cpuid.c | ||
| exit.c | ||
| fdt.c | ||
| font.c | ||
| hash.c | ||
| history.c | ||
| loadm.c | ||
| Makefile | ||
| mbr.c | ||
| mem_copy.c | ||
| mem_search.c | ||
| meminfo.c | ||
| msr.c | ||
| pci_mps.c | ||
| pinmux.c | ||
| pwm.c | ||
| rw.c | ||
| seama.c | ||
| setexpr.c | ||
| spawn.c | ||
| temperature.c | ||
| test_echo.c | ||
| test_pause.c | ||
| wget.c | ||