[PATCH v12 08/12] riscv: mm: Add page fault trace points
From: Nam Cao <hidden>
Date: 2025-07-09 17:56:41
Also in:
linux-riscv, lkml
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
Add page fault trace points, which are useful to implement RV monitor that watches page faults. Signed-off-by: Nam Cao <redacted> Acked-by: Alexandre Ghiti <redacted> Acked-by: Palmer Dabbelt <palmer@dabbelt.com> --- Cc: Paul Walmsley <redacted> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: linux-riscv@lists.infradead.org --- arch/riscv/mm/fault.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 0194324a0c50..04ed6f8acae4 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c@@ -20,6 +20,9 @@ #include <asm/ptrace.h> #include <asm/tlbflush.h> +#define CREATE_TRACE_POINTS +#include <trace/events/exceptions.h> + #include "../kernel/head.h" static void show_pte(unsigned long addr)
@@ -291,6 +294,11 @@ void handle_page_fault(struct pt_regs *regs) if (kprobe_page_fault(regs, cause)) return; + if (user_mode(regs)) + trace_page_fault_user(addr, regs, cause); + else + trace_page_fault_kernel(addr, regs, cause); + /* * Fault-in kernel-space virtual memory on-demand. * The 'reference' page table is init_mm.pgd.
--
2.39.5