From: Tejun Heo <tj@kernel.org>
To: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
surenb@google.com, mingo@redhat.com, peterz@infradead.org,
corbet@lwn.net, akpm@linux-foundation.org, rdunlap@infradead.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
songmuchun@bytedance.com, cgroups@vger.kernel.org
Subject: Re: [PATCH 8/9] sched/psi: add kernel cmdline parameter psi_inner_cgroup
Date: Wed, 3 Aug 2022 07:58:27 -1000 [thread overview]
Message-ID: <Yuq3Q6Y9dRnjjcPt@slm.duckdns.org> (raw)
In-Reply-To: <5a3410d6-428d-9ad1-3e5a-01ca805ceeeb@bytedance.com>
Hello,
On Wed, Aug 03, 2022 at 08:17:22PM +0800, Chengming Zhou wrote:
> > Assuming the above isn't wrong, if we can figure out how we can re-enable
> > it, which is more difficult as the counters need to be resynchronized with
> > the current state, that'd be ideal. Then, we can just allow each cgroup to
> > enable / disable PSI reporting dynamically as they see fit.
>
> This method is more fine-grained but more difficult like you said above.
> I think it may meet most needs to disable PSI stats in intermediate cgroups?
So, I'm not necessarily against implementing something easier but we at
least wanna get the interface right, so that if we decide to do the full
thing later we can easily expand on the existing interface. ie. let's please
not be too hacky. I don't think it'd be that difficult to implement
per-cgroup disable-only operation that we can later expand to allow
re-enabling, right?
Thanks.
--
tejun
next prev parent reply other threads:[~2022-08-03 17:58 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 4:04 [PATCH 0/9] sched/psi: some optimization and extension Chengming Zhou
2022-07-21 4:04 ` [PATCH 1/9] sched/psi: fix periodic aggregation shut off Chengming Zhou
2022-07-25 15:34 ` Johannes Weiner
2022-07-25 15:39 ` Johannes Weiner
2022-07-26 13:28 ` Chengming Zhou
2022-07-21 4:04 ` [PATCH 2/9] sched/psi: optimize task switch inside shared cgroups again Chengming Zhou
2022-07-21 4:04 ` [PATCH 3/9] sched/psi: move private helpers to sched/stats.h Chengming Zhou
2022-07-25 16:39 ` Johannes Weiner
2022-07-21 4:04 ` [PATCH 4/9] sched/psi: don't change task psi_flags when migrate CPU/group Chengming Zhou
2022-07-21 4:04 ` [PATCH 5/9] sched/psi: don't create cgroup PSI files when psi_disabled Chengming Zhou
2022-07-25 16:41 ` Johannes Weiner
2022-07-21 4:04 ` [PATCH 6/9] sched/psi: save percpu memory when !psi_cgroups_enabled Chengming Zhou
2022-07-25 16:47 ` Johannes Weiner
2022-07-21 4:04 ` [PATCH 7/9] sched/psi: cache parent psi_group to speed up groups iterate Chengming Zhou
2022-07-21 4:04 ` [PATCH 8/9] sched/psi: add kernel cmdline parameter psi_inner_cgroup Chengming Zhou
2022-07-25 16:52 ` Johannes Weiner
2022-07-26 13:38 ` [External] " Chengming Zhou
2022-07-26 17:54 ` Tejun Heo
2022-08-03 12:17 ` Chengming Zhou
2022-08-03 17:58 ` Tejun Heo [this message]
2022-08-03 19:22 ` Johannes Weiner
2022-08-03 19:48 ` Tejun Heo
2022-08-04 13:51 ` Chengming Zhou
2022-08-04 16:56 ` Johannes Weiner
2022-08-04 2:02 ` Chengming Zhou
2022-07-21 4:04 ` [PATCH 9/9] sched/psi: add PSI_IRQ to track IRQ/SOFTIRQ pressure Chengming Zhou
2022-07-21 10:00 ` kernel test robot
2022-07-21 22:10 ` kernel test robot
2022-07-22 3:30 ` Abel Wu
2022-07-22 6:13 ` Chengming Zhou
2022-07-22 7:14 ` Abel Wu
2022-07-22 7:33 ` Chengming Zhou
2022-07-25 18:26 ` Johannes Weiner
2022-07-26 13:55 ` [External] " Chengming Zhou
2022-07-27 11:28 ` Chengming Zhou
2022-07-27 13:00 ` Johannes Weiner
2022-07-27 15:09 ` Chengming Zhou
2022-07-27 16:07 ` Peter Zijlstra
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