Allow user-space (i.e. top) to read precise CPU time usage of
the process.
Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com>
---
Documentation/filesystems/proc.txt | 1 +
fs/proc/array.c | 5 +++++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/Documentation/filesystems/proc.txt
b/Documentation/filesystems/proc.txt
index fd8d0d5..ffd012b 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -319,6 +319,7 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7)
env_start address above which program environment is placed
env_end address below which program environment is placed
exit_code the thread's exit_code in the form reported by the waitpid
system call
+ exec_time total process time spent on the CPU, in nanoseconds
..............................................................................
The /proc/PID/maps file containing the currently mapped memory regions and
diff --git a/fs/proc/array.c b/fs/proc/array.c
index fef7850..ee47b29 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -403,6 +403,7 @@ static int do_task_stat(struct seq_file *m, struct
pid_namespace *ns,
unsigned long rsslim = 0;
char tcomm[sizeof(task->comm)];
unsigned long flags;
+ u64 sum_exec_runtime = 0;
state = *get_task_state(task);
vsize = eip = esp = 0;
@@ -459,6 +460,7 @@ static int do_task_stat(struct seq_file *m, struct
pid_namespace *ns,
thread_group_cputime_adjusted(task, &cputime);
utime = cputime.utime;
stime = cputime.stime;
+ sum_exec_runtime = cputime.sum_exec_runtime;
gtime += sig->gtime;
}
@@ -475,6 +477,7 @@ static int do_task_stat(struct seq_file *m, struct
pid_namespace *ns,
min_flt = task->min_flt;
maj_flt = task->maj_flt;
task_cputime_adjusted(task, &utime, &stime);
+ sum_exec_runtime = task->se.sum_exec_runtime;
gtime = task_gtime(task);
}
@@ -554,6 +557,8 @@ static int do_task_stat(struct seq_file *m, struct
pid_namespace *ns,
else
seq_put_decimal_ll(m, ' ', 0);
+ seq_put_decimal_ull(m, ' ', sum_exec_runtime);
+
seq_putc(m, '\n');
if (mm)
mmput(mm);
--
1.7.1
--
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