From: Hillf Danton <hdanton@sina.com>
To: Jarkko Sakkinen <jarkko@kernel.org>
Cc: David Howells <dhowells@redhat.com>,
Eric Biggers <ebiggers@kernel.org>,
James Morris <jmorris@namei.org>,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, keyrings@vger.kernel.org
Subject: Re: [PATCH v5] KEYS: key_garbage_collector(): process in chunks
Date: Fri, 30 Oct 2026 07:41:48 +0800 [thread overview]
Message-ID: <20261029234149.218-1-hdanton@sina.com> (raw)
In-Reply-To: <20261029172918.2118600-1-jarkko@kernel.org>
On Thu, 29 Oct 2026 19:29:17 +0200 Jarkko Sakkinen wrote:
> key_garbage_collector() has a design that is not resistant enough for
> workqueue lockups. The duration scales up relative to the number of items
> in the serial tree, which causes a reoccuring theme of being guilty of
> causing workqueue lockups.
>
Given cond_resched() the gc work is not a cpu hog, and given concurrency
workqueue can get individual cpu highly overloaded in short time, so what
you delivered is a half backed croissant, HBC, as you failed to make it
clear why lockup occurs when the number of gc items rockets up.
next prev parent reply other threads:[~2026-10-29 23:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-29 17:29 [PATCH v5] KEYS: key_garbage_collector(): process in chunks Jarkko Sakkinen
2026-10-29 17:40 ` Jarkko Sakkinen
2026-10-29 17:41 ` sashiko-bot
2026-10-29 23:41 ` Hillf Danton [this message]
2026-10-30 0:17 ` Jarkko Sakkinen
2026-10-30 0:22 ` Jarkko Sakkinen
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