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charset="utf-8" Instrumentation to print recently migrated pages in undefined instruction handler. This was used to determine if the faulting address was migrated earlier. Signed-off-by: Brian Ruley --- Not intended for integration. This is just to share the testing details. --- arch/arm/kernel/traps.c | 5 ++++ mm/migrate.c | 53 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index afbd2ebe5c39..64ef872f1555 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -28,6 +28,8 @@ #include #include =20 +void migrate_exec_log_dump(unsigned long fault_addr); + #include #include #include @@ -490,6 +492,9 @@ asmlinkage void do_undefinstr(struct pt_regs *regs) dump_instr(KERN_INFO, regs); } #endif + if (user_mode(regs)) + migrate_exec_log_dump((unsigned long)pc); + arm_notify_die("Oops - undefined instruction", regs, SIGILL, ILL_ILLOPC, pc, 0, 6); } diff --git a/mm/migrate.c b/mm/migrate.c index 2c3d489ecf51..987d0376b433 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -48,6 +48,54 @@ =20 #include =20 + +/* Debug: track recent exec page migrations */ +#define MIGRATE_EXEC_LOG_SIZE 8 +struct migrate_exec_entry { + unsigned long addr; + unsigned long old_pfn; + unsigned long new_pfn; + unsigned int pid; + bool flushed; +}; +static DEFINE_PER_CPU(struct migrate_exec_entry[MIGRATE_EXEC_LOG_SIZE], mi= grate_exec_log); +static DEFINE_PER_CPU(unsigned int, migrate_exec_idx); + +void migrate_exec_log_add(unsigned long addr, unsigned long old_pfn, + unsigned long new_pfn, bool flushed) +{ + unsigned int idx =3D __this_cpu_read(migrate_exec_idx); + struct migrate_exec_entry *log =3D this_cpu_ptr(migrate_exec_log); + struct migrate_exec_entry *e =3D &log[idx]; + + e->addr =3D addr; + e->old_pfn =3D old_pfn; + e->new_pfn =3D new_pfn; + e->pid =3D current->pid; + e->flushed =3D flushed; + __this_cpu_write(migrate_exec_idx, (idx + 1) % MIGRATE_EXEC_LOG_SIZE); +} + +void migrate_exec_log_dump(unsigned long fault_addr) +{ + int cpu; + + pr_err("SIGILL at %lx pid %d, recent exec migrations:\n", + fault_addr, current->pid); + for_each_online_cpu(cpu) { + struct migrate_exec_entry *log =3D per_cpu(migrate_exec_log, cpu); + int i; + for (i =3D 0; i < MIGRATE_EXEC_LOG_SIZE; i++) { + if (log[i].addr =3D=3D 0) + continue; + pr_err(" cpu%d: addr=3D%lx old_pfn=3D%lx new_pfn=3D%lx pid=3D%d flushe= d=3D%d%s\n", + cpu, log[i].addr, log[i].old_pfn, log[i].new_pfn, + log[i].pid, log[i].flushed, + (PAGE_ALIGN(fault_addr) =3D=3D PAGE_ALIGN(log[i].addr)) ? + " *** MATCH ***" : ""); + } + } +} #include "internal.h" #include "swap.h" =20 @@ -434,6 +482,11 @@ static bool remove_migration_pte(struct folio *folio, else folio_add_file_rmap_pte(folio, new, vma); set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte); + + if (vma->vm_flags & VM_EXEC) + migrate_exec_log_add(pvmw.address, + swp_offset(entry), page_to_pfn(new), + pte_young(pte)); } if (READ_ONCE(vma->vm_flags) & VM_LOCKED) mlock_drain_local(); --=20 2.47.3