From: Tejun Heo <tj@kernel.org>
To: Andrea Righi <arighi@nvidia.com>
Cc: sched-ext@lists.linux.dev, David Vernet <void@manifault.com>,
Changwoo Min <changwoo@igalia.com>,
Emil Tsalapatis <emil@etsalapatis.com>,
David Dai <david.dai@linux.dev>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] sched_ext: scx_qmap: Reset a child's cpuperf targets once its PERF revoke takes effect
Date: Fri, 09 Oct 2026 10:04:16 -1000 [thread overview]
Message-ID: <871113fbf23f16c8b291bbb06e9d6f36@kernel.org> (raw)
In-Reply-To: <asjNo3JmkmeTK8dr@gpd4>
Hello, Andrea.
On Fri, Oct 09, 2026 at 01:18:59PM +0200, Andrea Righi wrote:
> qa.rr_cids covers the entire shared pool, regardless of its current holder,
> right? If child A detaches during child B's turn, this resets the pool's cpuperf
> target even if B still holds PERF and has written its own target.
>
> Should we avoid resetting the current holder's target here?
Right. It's transient, the detach's repartition revokes the pool from B and
the handler resets it again when that lands, but B's targets get clobbered
in between. Will skip the pool when another child holds it in the next
version.
Thanks.
--
tejun
next prev parent reply other threads:[~2026-10-09 20:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 9:32 [PATCHSET v2 sched_ext/for-7.4] sched_ext: Add ops.sub_child_ecaps_updated() Tejun Heo
2026-10-08 9:32 ` [PATCH 1/2] sched_ext: Add ops.sub_child_ecaps_updated() to report a child's effective cap changes Tejun Heo
2026-10-09 11:17 ` Andrea Righi
2026-10-09 20:04 ` Tejun Heo
2026-10-09 20:14 ` Andrea Righi
2026-10-08 9:32 ` [PATCH 2/2] sched_ext: scx_qmap: Reset a child's cpuperf targets once its PERF revoke takes effect Tejun Heo
2026-10-09 11:18 ` Andrea Righi
2026-10-09 20:04 ` Tejun Heo [this message]
2026-10-09 20:48 ` [PATCH v3 " Tejun Heo
2026-10-09 21:38 ` Andrea Righi
2026-10-09 21:44 ` [PATCHSET v2 sched_ext/for-7.4] sched_ext: Add ops.sub_child_ecaps_updated() Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2026-10-08 0:03 [PATCHSET " Tejun Heo
2026-10-08 0:03 ` [PATCH 2/2] sched_ext: scx_qmap: Reset a child's cpuperf targets once its PERF revoke takes effect Tejun Heo
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