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[Xen-devel] [PATCH v8 0/3] xenbus/backend: Add a memory pressure handler callback

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 v7
 - Update sysfs-driver-xen-blkback for new parameter
   (suggested by Roger Pau Monné)
 - Use per-xen_blkif buffer_squeeze_end instead of global variable
   (suggested by Roger Pau Monné)

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 (3):
  xenbus/backend: Add memory pressure handler callback
  xen/blkback: Squeeze page pools if a memory pressure is detected
  xen/blkback: Remove unnecessary static variable name prefixes

 .../ABI/testing/sysfs-driver-xen-blkback      |  9 +++
 drivers/block/xen-blkback/blkback.c           | 57 ++++++++++++-------
 drivers/block/xen-blkback/common.h            |  2 +
 drivers/block/xen-blkback/xenbus.c            | 11 +++-
 drivers/xen/xenbus/xenbus_probe_backend.c     | 32 +++++++++++
 include/xen/xenbus.h                          |  1 +
 6 files changed, 90 insertions(+), 22 deletions(-)


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