From: Christoph Lameter <cl@gentwo.de>
To: Aaron Tomlin <atomlin@redhat.com>
Cc: frederic@kernel.org, mtosatti@redhat.com, tglx@linutronix.de,
mingo@kernel.org, peterz@infradead.org, pauld@redhat.com,
neelx@redhat.com, oleksandr@natalenko.name,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
Date: Mon, 25 Apr 2022 09:23:01 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2204250919400.2367@gentwo.de> (raw)
In-Reply-To: <20220422193647.3808657-1-atomlin@redhat.com>
On Fri, 22 Apr 2022, Aaron Tomlin wrote:
> A customer provided some evidence which indicates that the idle tick was
> stopped; albeit, CPU-specific vmstat counters still remained populated.
> Thus one can only assume quiet_vmstat() was not invoked on return to the
> idle loop.
Could we *always* fold the vmstat counters when entering idle mode? That
would make the logic less complicated. There is nothing else to do since
we are entering an idle state and if there are any counter deltas then we
have the time to process them. This may also decrease the time that
deltas exist significantly and an idle system will have accurate vmstat
counters.
next prev parent reply other threads:[~2022-04-25 7:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-22 19:36 Aaron Tomlin
2022-04-25 7:23 ` Christoph Lameter [this message]
2022-04-25 11:39 ` Aaron Tomlin
2022-04-25 12:09 ` Christoph Lameter
2022-04-25 13:27 ` Peter Zijlstra
2022-04-25 14:06 ` Christoph Lameter
2022-04-25 14:51 ` Aaron Tomlin
2022-04-25 14:57 ` Marcelo Tosatti
2022-04-25 14:17 ` Aaron Tomlin
2022-04-25 19:21 ` Marcelo Tosatti
2022-04-27 11:50 ` Aaron Tomlin
2022-04-27 14:40 ` Thomas Gleixner
2022-04-27 14:49 ` Aaron Tomlin
2022-04-28 18:10 ` Marcelo Tosatti
2022-05-04 9:32 ` Aaron Tomlin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.22.394.2204250919400.2367@gentwo.de \
--to=cl@gentwo.de \
--cc=atomlin@redhat.com \
--cc=frederic@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mingo@kernel.org \
--cc=mtosatti@redhat.com \
--cc=neelx@redhat.com \
--cc=oleksandr@natalenko.name \
--cc=pauld@redhat.com \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox