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From: SeongJae Park <sj38.park@gmail.com>
To: jgross@suse.com, axboe@kernel.dk, konrad.wilk@oracle.com,
Cc: linux-block@vger.kernel.org, sjpark@amazon.com,
	pdurrant@amazon.com, SeongJae Park <sjpark@amazon.de>,
	linux-kernel@vger.kernel.org, sj38.park@gmail.com,
Subject: [Xen-devel] [PATCH v7 0/2] xenbus/backend: Add a memory pressure handler callback
Date: Wed, 11 Dec 2019 18:10:13 +0000
Message-ID: <20191211181016.14366-1-sjpark@amazon.de> (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 lack

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).  The third patch is a trivial cleanup of
variable names.

Base Version

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

Patch History

Changes from v6
 - Remove more unnecessary prefixes (suggested by Roger Pau Monné)
 - Constify a variable (suggested by Roger Pau Monné)
 - Rename 'reclaim' into 'reclaim_memory' (suggested by Roger Pau Monné)
 - More wordsmith of the commit message (suggested by Roger Pau Monné)

Changes from v5
 - Wordsmith the commit messages (suggested by Roger Pau Monné)
 - Change the reclaim callback return type (suggested by Roger Pau Monné)
 - Change the type of the blkback squeeze duration variable
   (suggested by Roger Pau Monné)
 - Add a patch for removal of unnecessary static variable name prefixes
   (suggested by Roger Pau Monné)
 - Fix checkpatch.pl warnings

Changes from v4
 - Remove domain id parameter from the callback (suggested by Juergen Gross)
 - Rename xen-blkback module parameter (suggested by Stefan Nuernburger)

Changes from v3
 - Add general callback in xen_driver and use it (suggested by Juergen Gross)

Changes from v2
 - Rename the module parameter and variables for brevity
   (aggressive shrinking -> squeezing)

Changes from v1
 - 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 (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(-)


Xen-devel mailing list

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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11 18:10 SeongJae Park [this message]
2019-12-11 18:10 ` [Xen-devel] [PATCH v7 1/3] xenbus/backend: Add " SeongJae Park
2019-12-12  9:46   ` Roger Pau Monné
2019-12-11 18:10 ` [Xen-devel] [PATCH v7 2/3] xen/blkback: Squeeze page pools if a memory pressure is detected SeongJae Park
2019-12-12 11:42   ` 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 ` [Xen-devel] [PATCH v7 3/3] xen/blkback: Remove unnecessary static variable name prefixes SeongJae Park

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