Commit-ID: 68bc30bb9f33fc8d11e3d110d29e06490896a999 Gitweb: https://git.kernel.org/tip/68bc30bb9f33fc8d11e3d110d29e06490896a999 Author: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx> AuthorDate: Thu, 6 Jun 2019 09:22:34 +0800 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Wed, 12 Jun 2019 11:42:13 +0200 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: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Acked-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: peterz@xxxxxxxxxxxxx Cc: hpa@xxxxxxxxx Cc: ak@xxxxxxxxxxxxxxx Cc: tim.c.chen@xxxxxxxxxxxxxxx Cc: dave.hansen@xxxxxxxxx Cc: arjan@xxxxxxxxxxxxxxx Cc: adobriyan@xxxxxxxxx Cc: aubrey.li@xxxxxxxxx Cc: linux-api@xxxxxxxxxxxxxxx Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx> Cc: Linux API <linux-api@xxxxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20190606012236.9391-1-aubrey.li@xxxxxxxxxxxxxxx --- fs/proc/Kconfig | 4 ++++ fs/proc/base.c | 6 ++++++ include/linux/proc_fs.h | 9 +++++++++ 3 files changed, 19 insertions(+) diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig index 62ee41b4bbd0..4c3dcb718961 100644 --- a/fs/proc/Kconfig +++ b/fs/proc/Kconfig @@ -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 diff --git a/fs/proc/base.c b/fs/proc/base.c index 9c8ca6cd3ce4..ec436c61eece 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -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) diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index 52a283ba0465..a705aa2d03f9 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -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)
