From: SeongJae Park <sj38.park@gmail.com>
To: jgross@suse.com, axboe@kernel.dk, konrad.wilk@oracle.com,
roger.pau@citrix.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,
xen-devel@lists.xenproject.org
Subject: [Xen-devel] [PATCH v8 0/3] xenbus/backend: Add a memory pressure handler callback
Date: Fri, 13 Dec 2019 13:02:08 +0000 [thread overview]
Message-ID: <20191213130211.24011-1-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
flexibility.
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:
https://github.com/sjp38/linux/tree/blkback_squeezing_v8
Patch History
-------------
Changes from v7
(https://lore.kernel.org/xen-devel/20191211181016.14366-1-sjpark@amazon.de/)
- 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
(https://lore.kernel.org/linux-block/20191211042428.5961-1-sjpark@amazon.de/)
- 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
(https://lore.kernel.org/linux-block/20191210080628.5264-1-sjpark@amazon.de/)
- 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
(https://lore.kernel.org/xen-devel/20191209194305.20828-1-sjpark@amazon.com/)
- Remove domain id parameter from the callback (suggested by Juergen Gross)
- Rename xen-blkback module parameter (suggested by Stefan Nuernburger)
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 Gross)
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 (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(-)
--
2.17.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
next reply other threads:[~2019-12-13 21:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 13:02 SeongJae Park [this message]
2019-12-13 13:02 ` [Xen-devel] [PATCH v8 1/3] xenbus/backend: Add memory pressure handler callback SeongJae Park
2019-12-13 13:02 ` [Xen-devel] [PATCH v8 2/3] xen/blkback: Squeeze page pools if a memory pressure is detected SeongJae Park
2019-12-13 14:34 ` Roger Pau Monné
2019-12-13 15:02 ` SeongJae Park
2019-12-13 13:02 ` [Xen-devel] [PATCH v8 3/3] xen/blkback: Remove unnecessary static variable name prefixes SeongJae Park
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191213130211.24011-1-sjpark@amazon.de \
--to=sj38.park@gmail.com \
--cc=axboe@kernel.dk \
--cc=jgross@suse.com \
--cc=konrad.wilk@oracle.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pdurrant@amazon.com \
--cc=roger.pau@citrix.com \
--cc=sjpark@amazon.com \
--cc=sjpark@amazon.de \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).