Support xcall prefetch. Changes in v2: - Upadte the xcall prefetch state machine, remove the queued state and add prefetch, cancel states. - Remove the pfi lock and use atomic variables. - Change the 'xcall select' semantics and simplify the code a lot. - Remove keep_running, remove unrelated code. - Remove the count in struct read_cache_entry, and use percpu hit/miss count. - Remove sync mode, so remove struct read_cache_entry in struct task_struct. - Use hash table to find prefetch item for a file, which will not change the file struct KABI. - Use rwlock instead of spinlock for hash table. - Use alloc_page() instead kmalloc() to align 4KB. - Update the commit message. Jinjie Ruan (5): arm64: Introduce Xint software solution arm64: Add debugfs dir for xint eventpoll: xcall: Support async prefetch data in epoll xcall: Add /proc/xcall/stats dir for performance tuning xcall: eventpoll: add tracepoint Liao Chen (1): revert kpti bypass Yipeng Zou (3): arm64: Introduce xcall a faster svc exception handling arm64: Faster SVC exception handler with xcall xcall: Introduce xcall_select to mark special syscall arch/Kconfig | 64 ++++++ arch/arm64/Kconfig | 2 + arch/arm64/configs/openeuler_defconfig | 4 + arch/arm64/include/asm/cpucaps.h | 2 + arch/arm64/include/asm/exception.h | 3 + arch/arm64/kernel/asm-offsets.c | 3 + arch/arm64/kernel/cpufeature.c | 54 +++++ arch/arm64/kernel/entry-common.c | 22 ++ arch/arm64/kernel/entry.S | 183 ++++++++++++++++- arch/arm64/kernel/syscall.c | 57 ++++++ drivers/irqchip/irq-gic-v3.c | 123 +++++++++++ fs/eventpoll.c | 272 +++++++++++++++++++++++++ fs/open.c | 2 + fs/proc/base.c | 207 +++++++++++++++++++ fs/read_write.c | 29 +++ include/linux/fs.h | 46 +++++ include/linux/hardirq.h | 5 + include/linux/irqchip/arm-gic-v3.h | 13 ++ include/linux/sched.h | 5 + include/trace/events/fs.h | 93 +++++++++ kernel/fork.c | 32 +++ kernel/irq/debugfs.c | 33 +++ kernel/irq/internals.h | 18 ++ kernel/irq/irqdesc.c | 19 ++ kernel/irq/proc.c | 10 + kernel/softirq.c | 73 +++++++ kernel/sysctl.c | 36 ++++ 27 files changed, 1408 insertions(+), 2 deletions(-) -- 2.34.1