[PATCH v17 1/3] proc: add /proc/<pid>/arch_status
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STALE2731d
From: Aubrey Li <hidden>
Date: 2019-04-22 01:57:20
Also in:
lkml
Subsystem:
filesystems (vfs and infrastructure), proc filesystem, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
The architecture specific information of the running processes could be useful to the userland. Add /proc/<pid>/arch_status interface support to examine process architecture specific information externally. Signed-off-by: Aubrey Li <redacted> Cc: Thomas Gleixner <redacted> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andi Kleen <redacted> Cc: Tim Chen <redacted> Cc: Dave Hansen <redacted> Cc: Arjan van de Ven <redacted> Cc: Alexey Dobriyan <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Linux API <redacted> --- arch/x86/Kconfig | 1 + fs/proc/Kconfig | 10 ++++++++++ fs/proc/base.c | 23 +++++++++++++++++++++++ 3 files changed, 34 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5ad92419be19..d5a9c5ddd453 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig@@ -208,6 +208,7 @@ config X86 select USER_STACKTRACE_SUPPORT select VIRT_TO_BUS select X86_FEATURE_NAMES if PROC_FS + select PROC_PID_ARCH_STATUS if PROC_FS config INSTRUCTION_DECODER def_bool y
diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig
index 817c02b13b1d..101bf5054e81 100644
--- a/fs/proc/Kconfig
+++ b/fs/proc/Kconfig@@ -97,3 +97,13 @@ 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 + bool "Enable /proc/<pid>/arch_status file" + default n + help + Provides a way to examine process architecture specific information. + See <file:Documentation/filesystems/proc.txt> for more information. + + Say Y if you are running any user-space software which wants to obtain + process architecture specific information from this interface.
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6a803a0b75df..a890d9f12851 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c@@ -94,6 +94,7 @@ #include <linux/sched/debug.h> #include <linux/sched/stat.h> #include <linux/posix-timers.h> +#include <linux/processor.h> #include <trace/events/oom.h> #include "internal.h" #include "fd.h"
@@ -2957,6 +2958,22 @@ static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns, } #endif /* CONFIG_STACKLEAK_METRICS */ +/* + * Add support for task architecture specific output in /proc/pid/arch_status. + * task_arch_status() must be defined in asm/processor.h + */ +#ifdef CONFIG_PROC_PID_ARCH_STATUS +# ifndef task_arch_status +# define task_arch_status(m, task) +# endif +static int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *task) +{ + task_arch_status(m, task); + return 0; +} +#endif /* CONFIG_PROC_PID_ARCH_STATUS */ + /* * Thread groups */
@@ -3061,6 +3078,9 @@ 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 +3469,9 @@ 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)
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2.17.1