From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: xas_retry() based loops on PREEMPT_RT.
Date: Mon, 15 Nov 2021 08:41:22 +0100 [thread overview]
Message-ID: <20211115074122.3o4mjq4ddow7f2gp@linutronix.de> (raw)
In-Reply-To: <YY7kD/JWy9zuUGub@casper.infradead.org>
On 2021-11-12 22:00:47 [+0000], Matthew Wilcox wrote:
> Readers should all be skipping over ZERO entries (as they do NULL
> entries), not restarting the iteration if they see one. So it shouldn't
> factor into your "does it make progress" analysis, because an iteration
> should continue, not retry.
>
> Also, I am not aware of any user of ZERO entries in the page cache.
> It's possible that somebody has added one without me noticing, but there
> wasn't one earlier.
Thank you for confirming.
Sebastian
prev parent reply other threads:[~2021-11-15 7:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-12 17:33 xas_retry() based loops on PREEMPT_RT Sebastian Andrzej Siewior
2021-11-12 22:00 ` Matthew Wilcox
2021-11-15 7:41 ` Sebastian Andrzej Siewior [this message]
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