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From: SeongJae Park <sjpark@amazon.com>
To: <sjpark@amazon.com>
Cc: axboe@kernel.dk, sj38.park@gmail.com, konrad.wilk@oracle.com,
	pdurrant@amazon.com, linux-kernel@vger.kernel.org,
	linux-block@vger.kernel.org, xen-devel@lists.xenproject.org,
Subject: [Xen-devel] [PATCH v4 0/2] xenbus/backend: Add a memory pressure handler callback
Date: Mon, 9 Dec 2019 20:43:03 +0100
Message-ID: <20191209194305.20828-1-sjpark@amazon.com> (raw)

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 lacks a

To mitigate such problems, this patchset adds a memory reclaim callback
to 'xenbus_driver' (patch 1) and use it to mitigate the problem in
'xen-blkback' (patch 2).

Base Version

This patch is based on v5.4.  A complete tree is also available at my
public git repo:

Patch History

Changes from v3 (https://lore.kernel.org/xen-devel/20191209085839.21215-1-sjpark@amazon.com/)
 - Add general callback in xen_driver and use it (suggested by Juergen

Changes from v2 (https://lore.kernel.org/linux-block/af195033-23d5-38ed-b73b-f6e2e3b34541@amazon.com)
 - Rename the module parameter and variables for brevity (aggressive
   shrinking -> squeezing)

Changes from v1 (https://lore.kernel.org/xen-devel/20191204113419.2298-1-sjpark@amazon.com/)
 - Adjust the description to not use the term, `arbitrarily` (suggested
   by Paul Durrant)
 - Specify time unit of the duration in the parameter description,
   (suggested by Maximilian Heyne)
 - Change default aggressive shrinking duration from 1ms to 10ms
 - Merge two patches into one single patch

SeongJae Park (1):
  xen/blkback: Squeeze page pools if a memory pressure is detected

 drivers/block/xen-blkback/blkback.c | 35 +++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

SeongJae Park (2):
  xenbus/backend: Add memory pressure handler callback
  xen/blkback: Squeeze page pools if a memory pressure is detected

 drivers/block/xen-blkback/blkback.c       | 23 +++++++++++++++--
 drivers/block/xen-blkback/common.h        |  1 +
 drivers/block/xen-blkback/xenbus.c        |  3 ++-
 drivers/xen/xenbus/xenbus_probe_backend.c | 31 +++++++++++++++++++++++
 include/xen/xenbus.h                      |  1 +
 5 files changed, 56 insertions(+), 3 deletions(-)


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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 19:43 SeongJae Park [this message]
2019-12-09 19:43 ` [Xen-devel] [PATCH v4 1/2] xenbus/backend: Add " SeongJae Park
2019-12-10  6:11   ` Jürgen Groß
2019-12-10  6:19     ` SeongJae Park
2019-12-10  6:23   ` Jürgen Groß
2019-12-10  6:29     ` SeongJae Park
2019-12-09 19:43 ` [Xen-devel] [PATCH v4 2/2] xen/blkback: Squeeze page pools if a memory pressure is detected SeongJae Park
2019-12-10  6:24   ` Jürgen Groß

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