linux-kernel - Re: [Xen-devel] [PATCH v14 0/5] xenbus/backend: Add memory pressure handler callback

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Message-ID: <bf742e9a-6200-ed14-015e-17b865e8204e@oracle.com>
Date:   Thu, 30 Jan 2020 08:21:39 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     sjpark@...zon.com, jgross@...e.com, roger.pau@...rix.com,
        axboe@...nel.dk
Cc:     konrad.wilk@...cle.com, pdurrant@...zon.com,
        SeongJae Park <sjpark@...zon.de>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCH v14 0/5] xenbus/backend: Add memory pressure
 handler callback



On 1/27/20 3:18 AM, sjpark@...zon.com wrote:
> From: SeongJae Park <sjpark@...zon.de>
>
> 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 patchset adds a memory reclaim callback
> to 'xenbus_driver' (patch 1) and then introduce a lock for race
> condition avoidance (patch 2).  After that, patch 3 applies the callback
> mechanism to mitigate the problem in 'xen-blkback'.  The fourth and
> fifth patches are trivial cleanups; those fix nits we found during the
> development of this patchset.
>
> Note that this patch has only trivial changes from v13.  Please refer to
> below patch history for the changes.
>


Applied to for-linus-5.6.

-boris