From: Johannes Weiner <hannes@cmpxchg.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>,
Huangzhaoyang <huangzhaoyang@gmail.com>,
Zhaoyang Huang <zhaoyang.huang@unisoc.com>,
Ingo Molnar <mingo@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv4] psi: fix possible trigger missing in the window
Date: Mon, 14 Feb 2022 10:05:37 -0500 [thread overview]
Message-ID: <YgpvwTbakWSI4TWK@cmpxchg.org> (raw)
In-Reply-To: <1643093818-19835-1-git-send-email-huangzhaoyang@gmail.com>
On Tue, Jan 25, 2022 at 02:56:58PM +0800, Huangzhaoyang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
>
> When a new threshold breaching stall happens after a psi event was
> generated and within the window duration, the new event is not
> generated because the events are rate-limited to one per window. If
> after that no new stall is recorded then the event will not be
> generated even after rate-limiting duration has passed. This is
> happening because with no new stall, window_update will not be called
> even though threshold was previously breached. To fix this, record
> threshold breaching occurrence and generate the event once window
> duration is passed.
>
> Suggested-by: Suren Baghdasaryan <surenb@google.com>
> Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Hey Peter, would you mind taking this through the scheduler tree? It's
got my and Suren's acks. It's not a recent regression so I'm thinking
for 5.18 is fine. Thanks!
next prev parent reply other threads:[~2022-02-14 15:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-25 6:56 [PATCHv4] psi: fix possible trigger missing in the window Huangzhaoyang
2022-01-25 14:40 ` Johannes Weiner
2022-01-26 16:44 ` Suren Baghdasaryan
2022-02-14 15:05 ` Johannes Weiner [this message]
2022-02-14 15:09 ` Peter Zijlstra
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