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Shutemov" To: Dave Hansen , Andy Lutomirski , Peter Zijlstra Cc: x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , Bharata B Rao , Jacob Pan , Ashok Raj , Linus Torvalds , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Catalin Marinas Subject: [PATCHv14 09/17] mm: Expose untagging mask in /proc/$PID/status Date: Wed, 11 Jan 2023 15:37:28 +0300 Message-Id: <20230111123736.20025-10-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.38.2 In-Reply-To: <20230111123736.20025-1-kirill.shutemov@linux.intel.com> References: <20230111123736.20025-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3694180005 X-Stat-Signature: en3o1ejwt6cjws6csqmxkba67wuahher X-HE-Tag: 1673443443-376364 X-HE-Meta: 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 E/L5etYg kWW2vJzJ/rjrkydCkSCp2VI1Ppw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a line in /proc/$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 Acked-by: Catalin Marinas --- 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 #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 #endif /* !(__ASSEMBLY__) */ diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 1d0b743daebb..4b77c96da07f 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