proc: Add /proc/<pid>/arch_status (68bc30bb) · Commits · 戴 / test

Exposing architecture specific per process information is useful for various reasons. An example is the AVX512 usage on x86 which is important for task placement for power/performance optimizations. Adding this information to the existing /prcc/pid/status file would be the obvious choise, but it has been agreed on that a explicit arch_status file is better in separating the generic and architecture specific information. [ tglx: Massage changelog ] Signed-off-by:

Aubrey Li <aubrey.li@linux.intel.com> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Acked-by:

Andrew Morton <akpm@linux-foundation.org> Cc: peterz@infradead.org Cc: hpa@zytor.com Cc: ak@linux.intel.com Cc: tim.c.chen@linux.intel.com Cc: dave.hansen@intel.com Cc: arjan@linux.intel.com Cc: adobriyan@gmail.com Cc: aubrey.li@intel.com Cc: linux-api@vger.kernel.org Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Linux API <linux-api@vger.kernel.org> Link: https://lkml.kernel.org/r/20190606012236.9391-1-aubrey.li@linux.intel.com

fs/proc/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -98,3 +98,7 @@ config PROC_CHILDREN

		Say Y if you are running any user-space software which takes benefit from
		this interface. For example, rkt is such a piece of software.

		config PROC_PID_ARCH_STATUS
		def_bool n
		depends on PROC_FS

fs/proc/base.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -3061,6 +3061,9 @@ static const struct pid_entry tgid_base_stuff[] = {
		#ifdef CONFIG_STACKLEAK_METRICS
		ONE("stack_depth", S_IRUGO, proc_stack_depth),
		#endif
		#ifdef CONFIG_PROC_PID_ARCH_STATUS
		ONE("arch_status", S_IRUGO, proc_pid_arch_status),
		#endif
		};

		static int proc_tgid_base_readdir(struct file file, struct dir_context ctx)
		@@ -3449,6 +3452,9 @@ static const struct pid_entry tid_base_stuff[] = {
		#ifdef CONFIG_LIVEPATCH
		ONE("patch_state", S_IRUSR, proc_pid_patch_state),
		#endif
		#ifdef CONFIG_PROC_PID_ARCH_STATUS
		ONE("arch_status", S_IRUGO, proc_pid_arch_status),
		#endif
		};

		static int proc_tid_base_readdir(struct file file, struct dir_context ctx)

include/linux/proc_fs.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -75,6 +75,15 @@ struct proc_dir_entry proc_create_net_single_write(const char name, umode_t mo
		void *data);
		extern struct pid tgid_pidfd_to_pid(const struct file file);

		#ifdef CONFIG_PROC_PID_ARCH_STATUS
		/*
		* The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
		* provide proc_pid_arch_status() definition.
		*/
		int proc_pid_arch_status(struct seq_file m, struct pid_namespace ns,
		struct pid pid, struct task_struct task);
		#endif /* CONFIG_PROC_PID_ARCH_STATUS */

		#else /* CONFIG_PROC_FS */

		static inline void proc_root_init(void)

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