LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Nitesh Lal <nilal@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Nicolas Saenz Julienne <nsaenzju@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>,
Christoph Lameter <cl@linux.com>,
Juri Lelli <juri.lelli@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Alex Belits <abelits@belits.com>, Peter Xu <peterx@redhat.com>
Subject: Re: [patch V3 8/8] mm: vmstat_refresh: avoid queueing work item if cpu stats are clean
Date: Fri, 3 Sep 2021 13:38:33 -0400 [thread overview]
Message-ID: <CAFki+LkOvGdqRw=tzFvC6Z9vmi5wR60nAnAQ77Pb9t_N6Fu_ug@mail.gmail.com> (raw)
In-Reply-To: <20210901183345.GA51358@fuller.cnet>
On Wed, Sep 1, 2021 at 2:34 PM Marcelo Tosatti <mtosatti@redhat.com> wrote:
>
> On Wed, Sep 01, 2021 at 02:32:04PM -0300, Marcelo Tosatti wrote:
> > On Wed, Sep 01, 2021 at 09:05:55AM -0400, Nitesh Lal wrote:
> > > Hi Marcelo,
> > >
> > > On Tue, Aug 24, 2021 at 11:42 AM Marcelo Tosatti <mtosatti@redhat.com> wrote:
> > > >
> > > > It is not necessary to queue work item to run refresh_vm_stats
> > > > on a remote CPU if that CPU has no dirty stats and no per-CPU
> > > > allocations for remote nodes.
> > > >
> > > > This fixes sosreport hang (which uses vmstat_refresh) with
> > > > spinning SCHED_FIFO process.
> > > >
> > >
> > > I was still able to reproduce the sosreport hang with this patchset and I
> > > am wondering if that is because right now we do vmstat_sync and then cancel
> > > any pending jobs on a CPU in the context of one task.
> >
> > Hi Nitesh,
> >
> > Did you use chisol (with proper flags) and the modified oslat?
> >
Yes, I used your patches.
This is the command that I used:
chisol -q vmstat_sync -I conf ./oslat -f 1 -c 5,6,7,8,9,10,11,12,13,14,15 -D 15m
> > Tested with "echo 1 > /proc/sys/vmstat_refresh" and it was successful
> > (no hangs).
I see, I tried with "sos report --batch", which should have a similar effect.
--
Thanks
Nitesh
next prev parent reply other threads:[~2021-09-03 17:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 15:24 [patch V3 0/8] extensible prctl task isolation interface and vmstat sync Marcelo Tosatti
2021-08-24 15:24 ` [patch V3 1/8] add basic task isolation prctl interface Marcelo Tosatti
2021-08-24 15:24 ` [patch V3 2/8] add prctl task isolation prctl docs and samples Marcelo Tosatti
2021-08-26 9:59 ` Frederic Weisbecker
2021-08-26 12:11 ` Marcelo Tosatti
2021-08-26 19:15 ` Christoph Lameter
2021-08-26 20:37 ` Marcelo Tosatti
2021-08-27 13:08 ` Frederic Weisbecker
2021-08-27 14:44 ` Marcelo Tosatti
2021-08-30 11:38 ` Frederic Weisbecker
2021-09-01 13:11 ` Nitesh Lal
2021-09-01 17:34 ` Marcelo Tosatti
2021-09-01 17:49 ` Nitesh Lal
2021-08-24 15:24 ` [patch V3 3/8] task isolation: sync vmstats on return to userspace Marcelo Tosatti
2021-09-10 13:49 ` nsaenzju
2021-08-24 15:24 ` [patch V3 4/8] procfs: add per-pid task isolation state Marcelo Tosatti
2021-08-24 15:24 ` [patch V3 5/8] task isolation: sync vmstats conditional on changes Marcelo Tosatti
2021-08-25 9:46 ` Christoph Lameter
2021-08-24 15:24 ` [patch V3 6/8] KVM: x86: call isolation prepare from VM-entry code path Marcelo Tosatti
2021-08-24 15:24 ` [patch V3 7/8] mm: vmstat: move need_update Marcelo Tosatti
2021-08-24 15:24 ` [patch V3 8/8] mm: vmstat_refresh: avoid queueing work item if cpu stats are clean Marcelo Tosatti
2021-08-25 9:30 ` Christoph Lameter
2021-09-01 13:05 ` Nitesh Lal
2021-09-01 17:32 ` Marcelo Tosatti
2021-09-01 18:33 ` Marcelo Tosatti
2021-09-03 17:38 ` Nitesh Lal [this message]
2021-08-25 10:02 ` [patch V3 0/8] extensible prctl task isolation interface and vmstat sync Marcelo Tosatti
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='CAFki+LkOvGdqRw=tzFvC6Z9vmi5wR60nAnAQ77Pb9t_N6Fu_ug@mail.gmail.com' \
--to=nilal@redhat.com \
--cc=abelits@belits.com \
--cc=cl@linux.com \
--cc=frederic@kernel.org \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mtosatti@redhat.com \
--cc=nsaenzju@redhat.com \
--cc=peterx@redhat.com \
--cc=peterz@infradead.org \
/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;
as well as URLs for NNTP newsgroup(s).