linux-kernel - [PATCH 0/2] iowait and idle fixes in /proc/stat

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Message-Id: <20200610210549.61193-1-tom.hromatka@oracle.com>
Date:   Wed, 10 Jun 2020 15:05:47 -0600
From:   Tom Hromatka <tom.hromatka@...cle.com>
To:     tom.hromatka@...cle.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     fweisbec@...il.com, tglx@...utronix.de, mingo@...nel.org,
        adobriyan@...il.com
Subject: [PATCH 0/2] iowait and idle fixes in /proc/stat

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 monotonically increase.

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           | 24 ++++++------------------
 kernel/time/tick-sched.c |  9 +++++++++
 2 files changed, 15 insertions(+), 18 deletions(-)

-- 
2.25.3