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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed,  9 Sep 2020 08:41:20 -0600
From:   Tom Hromatka <tom.hromatka@...cle.com>
To:     tom.hromatka@...cle.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, fweisbec@...il.com,
        tglx@...utronix.de, mingo@...nel.org, adobriyan@...il.com
Subject: [RESEND 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(-)

-- 
2.25.4