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    Subject[PATCHv15 09/17] mm: Expose untagging mask in /proc/$PID/status
    Date
    Add a line in /proc/$PID/status to report untag_mask. It can be
    used to find out LAM status of the process from the outside. It is
    useful for debuggers.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Acked-by: Catalin Marinas <catalin.marinas@arm.com>
    Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    ---
    arch/arm64/include/asm/mmu_context.h | 6 ++++++
    arch/sparc/include/asm/mmu_context_64.h | 6 ++++++
    arch/x86/include/asm/mmu_context.h | 6 ++++++
    fs/proc/array.c | 6 ++++++
    include/linux/mmu_context.h | 7 +++++++
    5 files changed, 31 insertions(+)

    diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
    index 72dbd6400549..56911691bef0 100644
    --- a/arch/arm64/include/asm/mmu_context.h
    +++ b/arch/arm64/include/asm/mmu_context.h
    @@ -288,6 +288,12 @@ void post_ttbr_update_workaround(void);
    unsigned long arm64_mm_context_get(struct mm_struct *mm);
    void arm64_mm_context_put(struct mm_struct *mm);

    +#define mm_untag_mask mm_untag_mask
    +static inline unsigned long mm_untag_mask(struct mm_struct *mm)
    +{
    + return -1UL >> 8;
    +}
    +
    #include <asm-generic/mmu_context.h>

    #endif /* !__ASSEMBLY__ */
    diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h
    index 7a8380c63aab..799e797c5cdd 100644
    --- a/arch/sparc/include/asm/mmu_context_64.h
    +++ b/arch/sparc/include/asm/mmu_context_64.h
    @@ -185,6 +185,12 @@ static inline void finish_arch_post_lock_switch(void)
    }
    }

    +#define mm_untag_mask mm_untag_mask
    +static inline unsigned long mm_untag_mask(struct mm_struct *mm)
    +{
    + return -1UL >> adi_nbits();
    +}
    +
    #include <asm-generic/mmu_context.h>

    #endif /* !(__ASSEMBLY__) */
    diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
    index ca2e2ffdd3c6..43eb6b1357dd 100644
    --- a/arch/x86/include/asm/mmu_context.h
    +++ b/arch/x86/include/asm/mmu_context.h
    @@ -103,6 +103,12 @@ static inline void dup_lam(struct mm_struct *oldmm, struct mm_struct *mm)
    mm->context.untag_mask = oldmm->context.untag_mask;
    }

    +#define mm_untag_mask mm_untag_mask
    +static inline unsigned long mm_untag_mask(struct mm_struct *mm)
    +{
    + return mm->context.untag_mask;
    +}
    +
    static inline void mm_reset_untag_mask(struct mm_struct *mm)
    {
    mm->context.untag_mask = -1UL;
    diff --git a/fs/proc/array.c b/fs/proc/array.c
    index 49283b8103c7..d2a94eafe9a3 100644
    --- a/fs/proc/array.c
    +++ b/fs/proc/array.c
    @@ -428,6 +428,11 @@ static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
    seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
    }

    +static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
    +{
    + seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
    +}
    +
    int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
    struct pid *pid, struct task_struct *task)
    {
    @@ -443,6 +448,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
    task_mem(m, mm);
    task_core_dumping(m, task);
    task_thp_status(m, mm);
    + task_untag_mask(m, mm);
    mmput(mm);
    }
    task_sig(m, task);
    diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h
    index b9b970f7ab45..14b9c1fa05c4 100644
    --- a/include/linux/mmu_context.h
    +++ b/include/linux/mmu_context.h
    @@ -28,4 +28,11 @@ static inline void leave_mm(int cpu) { }
    # define task_cpu_possible(cpu, p) cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
    #endif

    +#ifndef mm_untag_mask
    +static inline unsigned long mm_untag_mask(struct mm_struct *mm)
    +{
    + return -1UL;
    +}
    +#endif
    +
    #endif
    --
    2.39.1
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