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Date: Mon, 24 Nov 2008 17:02:53 +0100
From: Jiri Pirko <jpirko@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH] getrusage: fill ru_maxrss value
Based on the patch previously posted by Frank Mayhar:
http://kerneltrap.org/mailarchive/linux-kernel/2007/9/20/264772
Slightly changed to not panic and to set the value properly.
This patch enables "time" application to show maxresident value correctly.
Signed-off-by: Jiri Pirko <jpirko@...hat.com>
---
include/linux/sched.h | 3 +++
kernel/exit.c | 21 +++++++++++++++++++++
kernel/fork.c | 2 ++
kernel/sys.c | 8 ++++++++
4 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 644ffbd..b88c538 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -560,6 +560,7 @@ 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 cmaxrss;
/*
* We don't bother to synchronize most readers of this at all,
@@ -1177,6 +1178,8 @@ struct task_struct {
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;
+/* maxrss gets the hiwater_rss in do_exit() */
+ unsigned long maxrss;
struct task_cputime cputime_expires;
struct list_head cpu_timers[3];
diff --git a/kernel/exit.c b/kernel/exit.c
index 2d8be7e..e0f5fd5 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -120,6 +120,8 @@ static void __exit_signal(struct task_struct *tsk)
sig->inblock += task_io_get_inblock(tsk);
sig->oublock += task_io_get_oublock(tsk);
task_io_accounting_add(&sig->ioac, &tsk->ioac);
+ if (tsk->maxrss > sig->cmaxrss)
+ sig->cmaxrss = tsk->maxrss;
sig = NULL; /* Marker for below. */
}
@@ -1051,6 +1053,14 @@ NORET_TYPE void do_exit(long code)
if (tsk->mm) {
update_hiwater_rss(tsk->mm);
update_hiwater_vm(tsk->mm);
+ BUG_ON(tsk->maxrss != 0);
+ /*
+ * Store the hiwater_rss in a task field, since when we need
+ * it in __exit_signal() the mm structure is gone; we can't
+ * stuff it in the signal structure since then we would be
+ * racing with wait_task_zombie().
+ */
+ tsk->maxrss = tsk->mm->hiwater_rss;
}
group_dead = atomic_dec_and_test(&tsk->signal->live);
if (group_dead) {
@@ -1354,6 +1364,17 @@ 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);
+ /*
+ * Save the maximum RSS of this task and all its terminated,
+ * waited-for children. Don't accumulate the RSS since, one,
+ * other operating systems (FreeBSD, AIX) do it this way and,
+ * two, the cumulative RSS of a long-lived process with lots
+ * of sequential child process would be meaningless.
+ */
+ if (sig->cmaxrss > psig->cmaxrss)
+ psig->cmaxrss = sig->cmaxrss;
+ if (p->maxrss > psig->cmaxrss)
+ psig->cmaxrss = p->maxrss;
spin_unlock_irq(&p->parent->sighand->siglock);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 2a372a0..a853be4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -622,6 +622,7 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
tsk->min_flt = tsk->maj_flt = 0;
tsk->nvcsw = tsk->nivcsw = 0;
+ tsk->maxrss = 0;
tsk->mm = NULL;
tsk->active_mm = NULL;
@@ -847,6 +848,7 @@ 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->cmaxrss = 0;
taskstats_tgid_init(sig);
task_lock(current->group_leader);
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8..4f3855b 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;
@@ -1588,6 +1589,13 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
accumulate_thread_rusage(t, r);
t = next_thread(t);
} while (t != p);
+ if (p->mm) {
+ update_hiwater_rss(p->mm);
+ if (r->ru_maxrss < p->mm->hiwater_rss)
+ r->ru_maxrss = p->mm->hiwater_rss;
+ } else {
+ r->ru_maxrss = p->maxrss;
+ }
break;
default:
--
1.5.6.5
--
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