[tip:sched/core] softirqs: Account ksoftirqd time as cpustat softirq
From: tip-bot for Venkatesh Pallipadi
Date: Wed Jan 26 2011 - 07:14:03 EST
Commit-ID: 414bee9ba613adb3804965e2d84db32d0599f9c6
Gitweb: http://git.kernel.org/tip/414bee9ba613adb3804965e2d84db32d0599f9c6
Author: Venkatesh Pallipadi <venki@xxxxxxxxxx>
AuthorDate: Tue, 21 Dec 2010 17:09:04 -0800
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 26 Jan 2011 12:33:22 +0100
softirqs: Account ksoftirqd time as cpustat softirq
softirq time in ksoftirqd context is not accounted in ns granularity
per cpu softirq stats, as we want that to be a part of ksoftirqd
exec_runtime.
Accounting them as softirq on /proc/stat separately.
Tested-by: Shaun Ruffell <sruffell@xxxxxxxxxx>
Signed-off-by: Venkatesh Pallipadi <venki@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <1292980144-28796-6-git-send-email-venki@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 2a3c979..8b718b5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3686,6 +3686,14 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
cpustat->irq = cputime64_add(cpustat->irq, tmp);
} else if (irqtime_account_si_update()) {
cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
+ } else if (this_cpu_ksoftirqd() == p) {
+ /*
+ * ksoftirqd time do not get accounted in cpu_softirq_time.
+ * So, we have to handle it separately here.
+ * Also, p->stime needs to be updated for ksoftirqd.
+ */
+ __account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
+ &cpustat->softirq);
} else if (user_tick) {
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
} else if (p == rq->idle) {
--
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