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proc: Add /proc/<pid>/arch_status

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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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Andrew Morton <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Andy Lutomirski <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Linux API <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Aubrey Li 2019-06-06 09:22:34 +08:00 • committed by Thomas Gleixner
commit 68bc30bb9f
3 changed files with 19 additions and 0 deletions
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4
fs/proc/Kconfig
View file

@ -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

6
fs/proc/base.c
View file

@ -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)