linux-kernel - Re: [PATCH 4.19 025/220] SUNRPC: Fix priority queue fairness

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Date:   Sun, 24 Nov 2019 10:21:43 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 025/220] SUNRPC: Fix priority queue fairness

On Fri 2019-11-22 11:26:30, Greg Kroah-Hartman wrote:
> From: Trond Myklebust <trond.myklebust@...merspace.com>
> 
> [ Upstream commit f42f7c283078ce3c1e8368b140e270755b1ae313 ]
> 
> Fix up the priority queue to not batch by owner, but by queue, so that
> we allow '1 << priority' elements to be dequeued before switching to
> the next priority queue.
> The owner field is still used to wake up requests in round robin order
> by owner to avoid single processes hogging the RPC layer by loading the
> queues.


>  include/linux/sunrpc/sched.h |   2 -
>  net/sunrpc/sched.c           | 109 +++++++++++++++++------------------
>  2 files changed, 54 insertions(+), 57 deletions(-)

While this might improve things, it is not fixing a serious bug.

Plus, it is over limit for stable.

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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