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Subject[PATCH, RESEND] getrusage: fill ru_maxrss value
This patch makes ->ru_maxrss value in struct rusage filled accordingly to
rss hiwater mark. This struct is filled as a parameter to
getrusage syscall. ->ru_maxrss value is set to pages which might be correct
as "time" application converts it to KBs.

To make this happen we extend struct signal_struct by two fields. The
first one is ->maxrss which we use to store rss hiwater of the task. The
second one is ->cmaxrss which we use to store highest rss hiwater of all
task childs. These values are used in k_getrusage() to actually fill
->ru_maxrss. k_getrusage() uses current rss hiwater value directly
if mm struct exists.

We clear the ->maxrss as a part of flush_old_exec() to be consistent
because bprm_mm_init() does not copy ->hiwater_rss.

Note that we use recently introduced get_mm_hiwater_rss() helper to
actually get the rss hiwater value:
http://lkml.org/lkml/2008/12/12/172


Signed-off-by: Jiri Pirko <jpirko@redhat.com>
---
fs/exec.c | 1 +
include/linux/sched.h | 1 +
kernel/exit.c | 4 ++++
kernel/fork.c | 1 +
kernel/sys.c | 12 ++++++++++++
5 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index ec5df9a..8d3d0f9 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -870,6 +870,7 @@ static int de_thread(struct task_struct *tsk)
sig->notify_count = 0;

no_thread_group:
+ sig->maxrss = 0;
exit_itimers(sig);
flush_itimer_signals();
if (leader)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index f4c70dc..41b04ee 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -563,6 +563,7 @@ struct signal_struct {
unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
unsigned long inblock, oublock, cinblock, coublock;
struct task_io_accounting ioac;
+ unsigned long maxrss, cmaxrss;

/*
* We don't bother to synchronize most readers of this at all,
diff --git a/kernel/exit.c b/kernel/exit.c
index 81b6372..61d622d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1053,6 +1053,8 @@ NORET_TYPE void do_exit(long code)
if (group_dead) {
hrtimer_cancel(&tsk->signal->real_timer);
exit_itimers(tsk->signal);
+ if (tsk->mm)
+ tsk->signal->maxrss = get_mm_hiwater_rss(tsk->mm);
}
acct_collect(code, group_dead);
if (group_dead)
@@ -1351,6 +1353,8 @@ static int wait_task_zombie(struct task_struct *p, int options,
sig->oublock + sig->coublock;
task_io_accounting_add(&psig->ioac, &p->ioac);
task_io_accounting_add(&psig->ioac, &sig->ioac);
+ if (psig->cmaxrss < sig->maxrss)
+ psig->cmaxrss = sig->maxrss;
spin_unlock_irq(&p->parent->sighand->siglock);
}

diff --git a/kernel/fork.c b/kernel/fork.c
index 495da2e..36ac3e5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -850,6 +850,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
task_io_accounting_init(&sig->ioac);
+ sig->maxrss = sig->cmaxrss = 0;
taskstats_tgid_init(sig);

task_lock(current->group_leader);
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8..67328ff 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1569,6 +1569,7 @@ 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;
+ r->ru_maxrss = p->signal->cmaxrss;

if (who == RUSAGE_CHILDREN)
break;
@@ -1583,6 +1584,8 @@ 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 (r->ru_maxrss < p->signal->maxrss)
+ r->ru_maxrss = p->signal->maxrss;
t = p;
do {
accumulate_thread_rusage(t, r);
@@ -1598,6 +1601,15 @@ 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);
+
+ task_lock(p);
+ if (p->mm) {
+ unsigned long maxrss = get_mm_hiwater_rss(p->mm);
+
+ if (r->ru_maxrss < maxrss)
+ r->ru_maxrss = maxrss;
+ }
+ task_unlock(p);
}

int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
--
1.5.6.5


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