From: Tom Hromatka <tom.hromatka@oracle.com>
To: tom.hromatka@oracle.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, fweisbec@gmail.com,
tglx@linutronix.de, mingo@kernel.org, adobriyan@gmail.com
Subject: [PATCH v2 0/2] iowait and idle fixes in /proc/stat
Date: Tue, 15 Sep 2020 13:36:25 -0600 [thread overview]
Message-ID: <20200915193627.85423-1-tom.hromatka@oracle.com> (raw)
A customer is using /proc/stat to track cpu usage in a VM and noted
that the iowait and idle times behave strangely when a cpu goes
offline and comes back online.
This patchset addresses two issues that can cause iowait and idle
to fluctuate up and down. With these changes, cpu iowait and idle
now only increase.
Changes from v1 to v2:
* Cleaned up commit messages
* Clarified code comments
* Further optimized the logic in fs/proc/stat.c
Tom Hromatka (2):
tick-sched: Do not clear the iowait and idle times
/proc/stat: Simplify iowait and idle calculations when cpu is offline
fs/proc/stat.c | 26 ++------------------------
kernel/time/tick-sched.c | 9 +++++++++
2 files changed, 11 insertions(+), 24 deletions(-)
--
2.25.4
next reply other threads:[~2020-09-15 19:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 19:36 Tom Hromatka [this message]
2020-09-15 19:36 ` [PATCH v2 1/2] tick-sched: Do not clear the iowait and idle times Tom Hromatka
2020-09-24 20:41 ` Thomas Gleixner
2020-09-15 19:36 ` [PATCH v2 2/2] /proc/stat: Simplify iowait and idle calculations when cpu is offline Tom Hromatka
2020-09-24 21:19 ` Thomas Gleixner
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