linux-kernel - [PATCH v9 1/3] /proc/pid/status: Add support for architecture specific output

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Message-Id: <20190211185931.4386-1-aubrey.li@intel.com>
Date:   Tue, 12 Feb 2019 02:59:29 +0800
From:   Aubrey Li <aubrey.li@...el.com>
To:     tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
        hpa@...or.com
Cc:     ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        dave.hansen@...el.com, arjan@...ux.intel.com, aubrey.li@...el.com,
        linux-kernel@...r.kernel.org, Aubrey Li <aubrey.li@...ux.intel.com>
Subject: [PATCH v9 1/3] /proc/pid/status: Add support for architecture specific output

The architecture specific information of the running processes could
be useful to the userland. Add support to examine process architecture
specific information externally.

Signed-off-by: Aubrey Li <aubrey.li@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
---
 fs/proc/array.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 0ceb3b6b37e7..d8cb5b5fd7bb 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -392,6 +392,10 @@ static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
 	seq_putc(m, '\n');
 }
 
+void __weak arch_proc_pid_status(struct seq_file *m, struct task_struct *task)
+{
+}
+
 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 			struct pid *pid, struct task_struct *task)
 {
@@ -414,6 +418,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 	task_cpus_allowed(m, task);
 	cpuset_task_status_allowed(m, task);
 	task_context_switch_counts(m, task);
+	arch_proc_pid_status(m, task);
 	return 0;
 }
 
-- 
2.17.1