From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@techsingularity.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Linux-RT <linux-rt-users@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4] locking/rwbase: Mitigate indefinite writer starvation
Date: Wed, 15 Feb 2023 17:02:03 +0100 [thread overview]
Message-ID: <Y+0B+1q4cYpjUcgr@linutronix.de> (raw)
In-Reply-To: <87ttzyyigk.ffs@tglx>
On 2023-02-06 15:30:35 [+0100], Thomas Gleixner wrote:
> What's the downside of actually forcing !RT readers into the slowpath
> once there is a writer waiting?
We always said that there are no RT users of rwsem. Therefore it
shouldn't matter because we still assume that nothing depends on this.
After all we had one a one reader implementation of rwsem and this is
the first report (to my knowledge) of a fallout since it was changed to
multi-reader.
That said let me update Mel's patch and resend it without this bit.
> Thanks,
>
> tglx
Sebastian
prev parent reply other threads:[~2023-02-15 16:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-20 14:08 Mel Gorman
2023-01-27 11:00 ` Mel Gorman
2023-02-06 14:30 ` Thomas Gleixner
2023-02-08 20:19 ` Mel Gorman
2023-02-15 16:02 ` Sebastian Andrzej Siewior [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Y+0B+1q4cYpjUcgr@linutronix.de \
--to=bigeasy@linutronix.de \
--cc=dave@stgolabs.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=mgorman@techsingularity.net \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®