From: "Roger Pau Monné" <roger.pau@citrix.com>
To: SeongJae Park <sj38.park@gmail.com>
Cc: <jgross@suse.com>, <axboe@kernel.dk>, <konrad.wilk@oracle.com>,
<linux-block@vger.kernel.org>, <sjpark@amazon.com>,
<pdurrant@amazon.com>, SeongJae Park <sjpark@amazon.de>,
<linux-kernel@vger.kernel.org>, <xen-devel@lists.xenproject.org>
Subject: Re: [Xen-devel] [PATCH v7 1/3] xenbus/backend: Add memory pressure handler callback
Date: Thu, 12 Dec 2019 10:46:00 +0100 [thread overview]
Message-ID: <20191212094600.GA11756@Air-de-Roger> (raw)
In-Reply-To: <20191211181016.14366-2-sjpark@amazon.de>
On Wed, Dec 11, 2019 at 06:10:14PM +0000, SeongJae Park wrote:
> Granting pages consumes backend system memory. In systems configured
> with insufficient spare memory for those pages, it can cause a memory
> pressure situation. However, finding the optimal amount of the spare
> memory is challenging for large systems having dynamic resource
> utilization patterns. Also, such a static configuration might lack
> flexibility.
>
> To mitigate such problems, this commit adds a memory reclaim callback to
> 'xenbus_driver'. If a memory pressure is detected, 'xenbus' requests
> every backend driver to volunarily release its memory.
>
> Note that it would be able to improve the callback facility for more
> sophisticated handlings of general pressures. For example, it would be
> possible to monitor the memory consumption of each device and issue the
> release requests to only devices which causing the pressure. Also, the
> callback could be extended to handle not only memory, but general
> resources. Nevertheless, this version of the implementation defers such
> sophisticated goals as a future work.
>
> Reviewed-by: Juergen Gross <jgross@suse.com>
> Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Thanks, Roger.
next prev parent reply other threads:[~2019-12-12 9:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 18:10 [PATCH v7 0/2] xenbus/backend: Add a memory pressure handler callback SeongJae Park
2019-12-11 18:10 ` [PATCH v7 1/3] xenbus/backend: Add " SeongJae Park
2019-12-12 9:46 ` Roger Pau Monné [this message]
2019-12-11 18:10 ` [PATCH v7 2/3] xen/blkback: Squeeze page pools if a memory pressure is detected SeongJae Park
2019-12-12 11:42 ` [Xen-devel] " Roger Pau Monné
2019-12-12 13:39 ` SeongJae Park
2019-12-12 15:23 ` Roger Pau Monné
2019-12-12 16:15 ` SeongJae Park
2019-12-12 15:27 ` Roger Pau Monné
2019-12-12 16:06 ` SeongJae Park
2019-12-13 9:27 ` Roger Pau Monné
2019-12-13 9:33 ` Jürgen Groß
2019-12-13 11:47 ` SeongJae Park
2019-12-11 18:10 ` [PATCH v7 3/3] xen/blkback: Remove unnecessary static variable name prefixes SeongJae Park
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