linux-kernel - [RFC PATCH 7/9] proc: add /proc/<pid>/universe to show livepatch status

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Message-Id: <ffb9e6f93851652457ff59d63822cc1aeade3f4d.1423499826.git.jpoimboe@redhat.com>
Date:	Mon,  9 Feb 2015 11:31:19 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Seth Jennings <sjenning@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 7/9] proc: add /proc/<pid>/universe to show livepatch status

Expose the per-task klp_universe value so users can determine which
tasks are holding up completion of a patching operation.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 fs/proc/base.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3f3d7ae..b9fe6b5 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2528,6 +2528,14 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
 	return err;
 }
 
+#ifdef CONFIG_LIVEPATCH
+static int proc_pid_klp_universe(struct seq_file *m, struct pid_namespace *ns,
+				 struct pid *pid, struct task_struct *task)
+{
+	return seq_printf(m, "%d\n", task->klp_universe);
+}
+#endif /* CONFIG_LIVEPATCH */
+
 /*
  * Thread groups
  */
@@ -2628,6 +2636,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_CHECKPOINT_RESTORE
 	REG("timers",	  S_IRUGO, proc_timers_operations),
 #endif
+#ifdef CONFIG_LIVEPATCH
+	ONE("universe", S_IRUGO, proc_pid_klp_universe),
+#endif
 };
 
 static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
-- 
2.1.0

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