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authorTomas Janousek <tjanouse@redhat.com>2007-07-15 23:39:42 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:41 -0700
commit924b42d5a2dbe508407a0a6290d3751f826bccdd (patch)
treec13a647ae93bcf033bddb713c1e117e84698c679
parent7c3f1a573237b90ef331267260358a0ec4ac9079 (diff)
Use boot based time for process start time and boot time in /proc
Commit 411187fb05cd11676b0979d9fbf3291db69dbce2 caused boot time to move and process start times to become invalid after suspend. Using boot based time for those restores the old behaviour and fixes the issue. [akpm@linux-foundation.org: little cleanup] Signed-off-by: Tomas Janousek <tjanouse@redhat.com> Cc: Tomas Smetana <tsmetana@redhat.com> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/array.c5
-rw-r--r--fs/proc/proc_misc.c6
-rw-r--r--include/linux/sched.h3
-rw-r--r--kernel/fork.c2
4 files changed, 10 insertions, 6 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 98e78e2f18d..680c913575f 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -440,8 +440,9 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole)
/* Temporary variable needed for gcc-2.96 */
/* convert timespec -> nsec*/
- start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC
- + task->start_time.tv_nsec;
+ start_time =
+ (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
+ + task->real_start_time.tv_nsec;
/* convert nsec -> ticks */
start_time = nsec_to_clock_t(start_time);
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 5fd49e47f83..19c9cbf1c32 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -443,12 +443,12 @@ static int show_stat(struct seq_file *p, void *v)
unsigned long jif;
cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
u64 sum = 0;
+ struct timespec boottime;
user = nice = system = idle = iowait =
irq = softirq = steal = cputime64_zero;
- jif = - wall_to_monotonic.tv_sec;
- if (wall_to_monotonic.tv_nsec)
- --jif;
+ getboottime(&boottime);
+ jif = boottime.tv_sec;
for_each_possible_cpu(i) {
int j;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index cfb680585ab..3cffc120466 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -972,7 +972,8 @@ struct task_struct {
unsigned int rt_priority;
cputime_t utime, stime;
unsigned long nvcsw, nivcsw; /* context switch counts */
- struct timespec start_time;
+ struct timespec start_time; /* monotonic time */
+ struct timespec real_start_time; /* boot based time */
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
unsigned long min_flt, maj_flt;
diff --git a/kernel/fork.c b/kernel/fork.c
index da3a155bba0..344d693fdc7 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1059,6 +1059,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
+ p->real_start_time = p->start_time;
+ monotonic_to_bootbased(&p->real_start_time);
p->security = NULL;
p->io_context = NULL;
p->io_wait = NULL;