From: "Cheatham, Benjamin" <benjamin.cheatham@amd.com>
To: Anisa Su <anisa.su887@gmail.com>, <linux-cxl@vger.kernel.org>
Subject: Re: [PATCH v2 3/4] cxl/events: Bound the per-log Get Event Records loop
Date: Tue, 1 Sep 2026 14:19:12 -0500 [thread overview]
Message-ID: <0ef743e4-2cc9-4823-b6de-e2babb1e1353@amd.com> (raw)
In-Reply-To: <20260901002912.958-4-anisa.su@samsung.com>
On 8/31/2026 7:26 PM, Anisa Su wrote:
> cxl_mem_get_records_log() re-queries a log until the device reports it
> empty. A misbehaving device that never stops reporting records keeps the
> event thread stuck in this loop, and there is no cond_resched() to let anything
> else on the CPU run.
>
> Cap the passes at 128 and reschedule between them. Each pass gets up to
> a full mailbox payload of records from the log, so the cap is a generous
> upper bound. Report hitting the cap as an error and let the caller give
> up on the log.
>
> Fixes: 6ebe28f9ec72 ("cxl/mem: Read, trace, and clear events on driver load")
> Signed-off-by: Anisa Su <anisa.su@samsung.com>
> ---
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
next prev parent reply other threads:[~2026-09-01 19:19 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 0:26 [PATCH v2 0/4] cxl/events: Robustify event interrupt handling Anisa Su
2026-09-01 0:26 ` [PATCH v2 1/4] cxl/events: Bound get records loop in cxl_event_thread() Anisa Su
2026-09-01 0:41 ` sashiko-bot
2026-09-01 11:48 ` Li Ming
2026-09-01 17:59 ` Anisa Su
2026-09-01 19:17 ` Cheatham, Benjamin
2026-09-01 0:26 ` [PATCH v2 2/4] cxl/events: Validate the record count reported by the device Anisa Su
2026-09-01 19:19 ` Cheatham, Benjamin
2026-09-01 0:26 ` [PATCH v2 3/4] cxl/events: Bound the per-log Get Event Records loop Anisa Su
2026-09-01 0:43 ` sashiko-bot
2026-09-01 19:19 ` Cheatham, Benjamin [this message]
2026-09-01 0:26 ` [PATCH v2 4/4] cxl/events: Return IRQ_NONE when no events were processed Anisa Su
2026-09-01 0:38 ` sashiko-bot
2026-09-01 19:19 ` Cheatham, Benjamin
2026-09-08 22:26 ` Jonathan Cameron
2026-09-02 8:27 ` [PATCH v2 0/4] cxl/events: Robustify event interrupt handling Anisa Su
2026-09-02 19:06 ` Davidlohr Bueso
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