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Commit 68bc30bb authored by Aubrey Li's avatar Aubrey Li Committed by Thomas Gleixner
Browse files

proc: Add /proc/<pid>/arch_status 



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: default avatarAubrey Li <aubrey.li@linux.intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarAndrew 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
parent d1fdb6d8

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)