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From: Davidlohr Bueso on 23 Jul 2010 13:50
Hi,

This patch exports a process's age, in seconds, adding a /proc/#/age file.

Thanks,
Davidlohr

Signed-off-by: Davidlohr Bueso <dave(a)gnu.org>
---
fs/proc/base.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index acb7ef8..a5a4832 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -38,13 +38,16 @@
* ChangeLog:
* 10-Mar-2005
* 10LE Instituto Nokia de Tecnologia - INdT:
- * A better way to walks through the page table as suggested by Hugh Dickins.
+ * A better way to walk through the page table as suggested by Hugh Dickins.
*
* Simo Piiroinen <simo.piiroinen(a)nokia.com>:
* Smaps information related to shared, private, clean and dirty pages.
*
* Paul Mundt <paul.mundt(a)nokia.com>:
* Overall revision about smaps.
+ *
+ * 2010 - Davidlohr Bueso <dave(a)gnu.org>:
+ * Added process age (/proc/#/age), in seconds.
*/

#include <asm/uaccess.h>
@@ -2558,6 +2561,18 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
return 0;
}

+static int proc_pid_age(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ struct timespec uptime;
+
+ do_posix_clock_monotonic_gettime(&uptime);
+ monotonic_to_bootbased(&uptime);
+ seq_printf(m, "%lu\n", uptime.tv_sec - task->real_start_time.tv_sec);
+
+ return 0;
+}
+
/*
* Thread groups
*/
@@ -2575,6 +2590,7 @@ static const struct pid_entry tgid_base_stuff[] = {
INF("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
+ ONE("age", S_IRUSR, proc_pid_age),
INF("limits", S_IRUSR, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
@@ -2910,6 +2926,7 @@ static const struct pid_entry tid_base_stuff[] = {
INF("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
+ ONE("age", S_IRUSR, proc_pid_age),
INF("limits", S_IRUSR, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
--
1.7.0.4

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