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Commit 924b42d5 authored by Tomas Janousek's avatar Tomas Janousek Committed by Linus Torvalds
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Use boot based time for process start time and boot time in /proc 



Commit 411187fb 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: default avatarTomas Janousek <tjanouse@redhat.com>
Cc: Tomas Smetana <tsmetana@redhat.com>
Acked-by: default avatarJohn Stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7c3f1a57

fs/proc/array.c

+3 −2
Original line number Diff line number Diff line
@@ -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);

fs/proc/proc_misc.c

+3 −3
Original line number Diff line number Diff line
@@ -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;

include/linux/sched.h

+2 −1
Original line number Diff line number Diff line
@@ -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;

kernel/fork.c

+2 −0
Original line number Diff line number Diff line
@@ -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;