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Date: Tue, 27 Dec 2022 06:08:21 +0300 From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> To: Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org> Cc: x86@...nel.org, Kostya Serebryany <kcc@...gle.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>, Andrey Konovalov <andreyknvl@...il.com>, Alexander Potapenko <glider@...gle.com>, Taras Madan <tarasmadan@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, "H . J . Lu" <hjl.tools@...il.com>, Andi Kleen <ak@...ux.intel.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, Bharata B Rao <bharata@....com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, Ashok Raj <ashok.raj@...el.com>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Catalin Marinas <catalin.marinas@....com> Subject: [PATCHv13 08/16] mm: Expose untagging mask in /proc/$PID/status Add a line in /proc/$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@...ux.intel.com> Acked-by: Catalin Marinas <catalin.marinas@....com> --- 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 71581cb4811b..7f9f9978c811 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 -- 2.38.2
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