This it_real_value field is currently practically unused and depending on the
source it has different meanings. Until 2.6.12 it was set to the initial
it_value from setitimer(), 2.6.13 updates it to the next itimer value, 2.6.14
doesn't set it anymore at all. proc(5) says "The time in jiffies before the
next SIGALRM is sent to the process due to an interval timer.", which was true
until 1.3.x.
I don't think anyone seriously uses this field, so just remove it.
Signed-off-by: Roman Zippel <[email protected]>
---
fs/proc/array.c | 4 +---
include/linux/sched.h | 1 -
kernel/fork.c | 1 -
3 files changed, 1 insertion(+), 5 deletions(-)
Index: linux-2.6-mm/fs/proc/array.c
===================================================================
--- linux-2.6-mm.orig/fs/proc/array.c 2005-11-28 22:30:41.000000000 +0100
+++ linux-2.6-mm/fs/proc/array.c 2005-11-28 22:31:17.000000000 +0100
@@ -330,7 +330,6 @@ static int do_task_stat(struct task_stru
unsigned long min_flt = 0, maj_flt = 0;
cputime_t cutime, cstime, utime, stime;
unsigned long rsslim = 0;
- unsigned long it_real_value = 0;
struct task_struct *t;
char tcomm[sizeof(task->comm)];
@@ -386,7 +385,6 @@ static int do_task_stat(struct task_stru
utime = cputime_add(utime, task->signal->utime);
stime = cputime_add(stime, task->signal->stime);
}
- it_real_value = task->signal->it_real_value;
}
ppid = pid_alive(task) ? task->group_leader->real_parent->tgid : 0;
read_unlock(&tasklist_lock);
@@ -435,7 +433,7 @@ static int do_task_stat(struct task_stru
priority,
nice,
num_threads,
- jiffies_to_clock_t(it_real_value),
+ 0L,
start_time,
vsize,
mm ? get_mm_rss(mm) : 0,
Index: linux-2.6-mm/include/linux/sched.h
===================================================================
--- linux-2.6-mm.orig/include/linux/sched.h 2005-11-28 22:31:12.000000000 +0100
+++ linux-2.6-mm/include/linux/sched.h 2005-11-28 22:31:17.000000000 +0100
@@ -405,7 +405,6 @@ struct signal_struct {
/* ITIMER_REAL timer for the process */
struct ptimer real_timer;
struct task_struct *tsk;
- unsigned long it_real_value;
ktime_t it_real_incr;
/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
Index: linux-2.6-mm/kernel/fork.c
===================================================================
--- linux-2.6-mm.orig/kernel/fork.c 2005-11-28 22:31:12.000000000 +0100
+++ linux-2.6-mm/kernel/fork.c 2005-11-28 22:31:17.000000000 +0100
@@ -794,7 +794,6 @@ static inline int copy_signal(unsigned l
init_sigpending(&sig->shared_pending);
INIT_LIST_HEAD(&sig->posix_timers);
- sig->it_real_value = 0;
sig->it_real_incr.tv64 = KTIME_ZERO;
ptimer_init(&sig->real_timer, CLOCK_MONOTONIC);
sig->real_timer.function = it_real_fn;
-
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