[PATCH] sched, cpuacct: fix niced guest time accounting
From: Ryota Ozaki
Date: Tue Oct 20 2009 - 09:41:12 EST
CPU time of a guest is always accounted in 'user' time
without concern for the nice value of its counterpart
process although the guest is scheduled under the nice
value.
This patch fixes the defect and accounts cpu time of
a niced guest in 'nice' time as same as a niced process.
And also the patch adds 'guest_nice' to cpuacct. The
value provides niced guest cpu time which is like 'nice'
to 'user'.
Signed-off-by: Ryota Ozaki <ozaki.ryota@xxxxxxxxx>
Acked-by: Avi Kivity <avi@xxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 3 ++-
fs/proc/stat.c | 17 +++++++++++------
include/linux/kernel_stat.h | 1 +
kernel/sched.c | 9 +++++++--
4 files changed, 21 insertions(+), 9 deletions(-)
diff --git a/Documentation/filesystems/proc.txt
b/Documentation/filesystems/proc.txt
index 2c48f94..4af0018 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -1072,7 +1072,8 @@ second). The meanings of the columns are as
follows, from left to right:
- irq: servicing interrupts
- softirq: servicing softirqs
- steal: involuntary wait
-- guest: running a guest
+- guest: running a normal guest
+- guest_nice: running a niced guest
The "intr" line gives counts of interrupts serviced since boot time, for =
each
of the possible system interrupts. The first column is the total of =
all
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 7cc726c..67c30a7 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -27,7 +27,7 @@ static int show_stat(struct seq_file *p, void *v)
int i, j;
unsigned long jif;
cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
- cputime64_t guest;
+ cputime64_t guest, guest_nice;
u64 sum =3D 0;
u64 sum_softirq =3D 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] =3D {0};
@@ -36,7 +36,7 @@ static int show_stat(struct seq_file *p, void *v)
user =3D nice =3D system =3D idle =3D iowait =3D
irq =3D softirq =3D steal =3D cputime64_zero;
- guest =3D cputime64_zero;
+ guest =3D guest_nice =3D cputime64_zero;
getboottime(&boottime);
jif =3D boottime.tv_sec;
@@ -51,6 +51,8 @@ static int show_stat(struct seq_file *p, void *v)
softirq =3D cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal =3D cputime64_add(steal, kstat_cpu(i).cpustat.steal);
guest =3D cputime64_add(guest, kstat_cpu(i).cpustat.guest);
+ guest_nice =3D cputime64_add(guest_nice,
+ kstat_cpu(i).cpustat.guest_nice);
for_each_irq_nr(j) {
sum +=3D kstat_irqs_cpu(j, i);
}
@@ -65,7 +67,7 @@ static int show_stat(struct seq_file *p, void *v)
}
sum +=3D arch_irq_stat();
- seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu=A5n",
+ seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu=A5n=
",
(unsigned long long)cputime64_to_clock_t(user),
(unsigned long long)cputime64_to_clock_t(nice),
(unsigned long long)cputime64_to_clock_t(system),
@@ -74,7 +76,8 @@ static int show_stat(struct seq_file *p, void *v)
(unsigned long long)cputime64_to_clock_t(irq),
(unsigned long long)cputime64_to_clock_t(softirq),
(unsigned long long)cputime64_to_clock_t(steal),
- (unsigned long long)cputime64_to_clock_t(guest));
+ (unsigned long long)cputime64_to_clock_t(guest),
+ (unsigned long long)cputime64_to_clock_t(guest_nice));
for_each_online_cpu(i) {
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
@@ -88,8 +91,9 @@ static int show_stat(struct seq_file *p, void *v)
softirq =3D kstat_cpu(i).cpustat.softirq;
steal =3D kstat_cpu(i).cpustat.steal;
guest =3D kstat_cpu(i).cpustat.guest;
+ guest_nice =3D kstat_cpu(i).cpustat.guest_nice;
seq_printf(p,
- "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu=A5n",
+ "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu=A5n",
i,
(unsigned long long)cputime64_to_clock_t(user),
(unsigned long long)cputime64_to_clock_t(nice),
@@ -99,7 +103,8 @@ static int show_stat(struct seq_file *p, void *v)
(unsigned long long)cputime64_to_clock_t(irq),
(unsigned long long)cputime64_to_clock_t(softirq),
(unsigned long long)cputime64_to_clock_t(steal),
- (unsigned long long)cputime64_to_clock_t(guest));
+ (unsigned long long)cputime64_to_clock_t(guest),
+ (unsigned long long)cputime64_to_clock_t(guest_nice));
}
seq_printf(p, "intr %llu", (unsigned long long)sum);
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 348fa88..c059044 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -25,6 +25,7 @@ struct cpu_usage_stat {
cputime64_t iowait;
cputime64_t steal;
cputime64_t guest;
+ cputime64_t guest_nice;
};
struct kernel_stat {
diff --git a/kernel/sched.c b/kernel/sched.c
index 00f9e71..8dd285e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5017,8 +5017,13 @@ static void account_guest_time(struct
task_struct *p, cputime_t cputime,
p->gtime =3D cputime_add(p->gtime, cputime);
/* Add guest time to cpustat. */
- cpustat->user =3D cputime64_add(cpustat->user, tmp);
- cpustat->guest =3D cputime64_add(cpustat->guest, tmp);
+ if (TASK_NICE(p) > 0) {
+ cpustat->nice =3D cputime64_add(cpustat->nice, tmp);
+ cpustat->guest_nice =3D cputime64_add(cpustat->guest_nice, tmp);
+ } else {
+ cpustat->user =3D cputime64_add(cpustat->user, tmp);
+ cpustat->guest =3D cputime64_add(cpustat->guest, tmp);
+ }
}
/*
--=20
1.6.2.5
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