3 files changed, 21 insertions, 0 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 61bb1761c7b8..60d6fdcc9265 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -947,6 +947,8 @@ NORET_TYPE void do_exit(long code)
         if (group_dead) {
                 hrtimer_cancel(&tsk->signal->real_timer);
                 exit_itimers(tsk->signal);
+                if (tsk->mm)
+                        setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm);
         }
         acct_collect(code, group_dead);
         if (group_dead)
@@ -1210,6 +1212,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
         if (likely(!traced) && likely(!task_detached(p))) {
                 struct signal_struct *psig;
                 struct signal_struct *sig;
+                unsigned long maxrss;
 
                 /*
                  * The resource counters for the group leader are in its
@@ -1258,6 +1261,9 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
                 psig->coublock +=
                         task_io_get_oublock(p) +
                         sig->oublock + sig->coublock;
+                maxrss = max(sig->maxrss, sig->cmaxrss);
+                if (psig->cmaxrss < maxrss)
+                        psig->cmaxrss = maxrss;
                 task_io_accounting_add(&psig->ioac, &p->ioac);
                 task_io_accounting_add(&psig->ioac, &sig->ioac);
                 spin_unlock_irq(&p->real_parent->sighand->siglock);
diff --git a/kernel/fork.c b/kernel/fork.c
index 1020977b57ca..7cf45812ce84 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -866,6 +866,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
         sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
         sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
+        sig->maxrss = sig->cmaxrss = 0;
         task_io_accounting_init(&sig->ioac);
         sig->sum_sched_runtime = 0;
         taskstats_tgid_init(sig);
diff --git a/kernel/sys.c b/kernel/sys.c
index ea5c3bcac881..ebcb15611728 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1338,6 +1338,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
         unsigned long flags;
         cputime_t utime, stime;
         struct task_cputime cputime;
+        unsigned long maxrss = 0;
 
         memset((char *) r, 0, sizeof *r);
         utime = stime = cputime_zero;
@@ -1346,6 +1347,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                 utime = task_utime(current);
                 stime = task_stime(current);
                 accumulate_thread_rusage(p, r);
+                maxrss = p->signal->maxrss;
                 goto out;
         }
 
@@ -1363,6 +1365,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                         r->ru_majflt = p->signal->cmaj_flt;
                         r->ru_inblock = p->signal->cinblock;
                         r->ru_oublock = p->signal->coublock;
+                        maxrss = p->signal->cmaxrss;
 
                         if (who == RUSAGE_CHILDREN)
                                 break;
@@ -1377,6 +1380,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                         r->ru_majflt += p->signal->maj_flt;
                         r->ru_inblock += p->signal->inblock;
                         r->ru_oublock += p->signal->oublock;
+                        if (maxrss < p->signal->maxrss)
+                                maxrss = p->signal->maxrss;
                         t = p;
                         do {
                                 accumulate_thread_rusage(t, r);
@@ -1392,6 +1397,15 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 out:
         cputime_to_timeval(utime, &r->ru_utime);
         cputime_to_timeval(stime, &r->ru_stime);
+
+        if (who != RUSAGE_CHILDREN) {
+                struct mm_struct *mm = get_task_mm(p);
+                if (mm) {
+                        setmax_mm_hiwater_rss(&maxrss, mm);
+                        mmput(mm);
+                }
+        }
+        r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
 }
 
 int getrusage(struct task_struct *p, int who, struct rusage __user *ru)