Messages in this thread |  | | Date | Thu, 27 Oct 2011 12:30:20 -0700 | From | Kurt Hackel <> | Subject | Re: [GIT PULL] mm: frontswap (for 3.2 window) |
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Hi, As the dev manager for OracleVM (x86) I'd like to express my interest in seeing frontswap get merged upstream. The OracleVM product has been capable of working with frontswap for over a year now, and we'd very much like to see the complete cleancache+frontswap feature set fully upstreamed. Oracle is also fully committed to the ongoing maintenance of frontswap. thanks kurt
Kurt C. Hackel Development Director Oracle VM kurt.hackel@oracle.com
On 10/27/2011 11:52 AM, Dan Magenheimer wrote: > Hi Linus -- > > Frontswap now has FOUR users: Two already merged in-tree (zcache > and Xen) and two still in development but in public git trees > (RAMster and KVM). Frontswap is part 2 of 2 of the core kernel > changes required to support transcendent memory; part 1 was cleancache > which you merged at 3.0 (and which now has FIVE users). > > Frontswap patches have been in linux-next since June 3 (with zero > changes since Sep 22). First posted to lkml in June 2009, frontswap > is now at version 11 and has incorporated feedback from a wide range > of kernel developers. For a good overview, see > http://lwn.net/Articles/454795. > If further rationale is needed, please see the end of this email > for more info. > > SO... Please pull: > > git://oss.oracle.com/git/djm/tmem.git #tmem > > since git commit b6fd41e29dea9c6753b1843a77e50433e6123bcb > Linus Torvalds (1): > > Linux 3.1-rc6 > > (identical commits being pulled by sfr into linux-next since Sep22) > > Note that in addition to frontswap, this commit series includes > some minor changes to cleancache necessary for consistency with > changes for frontswap required by Andrew Morton (e.g. flush->invalidate > name change; use debugfs instead of sysfs). As a result, a handful > of cleancache-related VFS files incur only a very small change. > > Dan Magenheimer (8): > mm: frontswap: add frontswap header file > mm: frontswap: core swap subsystem hooks and headers > mm: frontswap: core frontswap functionality > mm: frontswap: config and doc files > mm: cleancache: s/flush/invalidate/ > mm: frontswap/cleancache: s/flush/invalidate/ > mm: cleancache: report statistics via debugfs instead of sysfs. > mm: cleancache: Use __read_mostly as appropiate. > > Diffstat: > .../ABI/testing/sysfs-kernel-mm-cleancache | 11 - > Documentation/vm/cleancache.txt | 41 ++-- > Documentation/vm/frontswap.txt | 210 +++++++++++++++ > drivers/staging/zcache/zcache-main.c | 10 +- > drivers/xen/tmem.c | 10 +- > fs/buffer.c | 2 +- > fs/super.c | 2 +- > include/linux/cleancache.h | 24 +- > include/linux/frontswap.h | 9 +- > include/linux/swap.h | 4 + > include/linux/swapfile.h | 13 + > mm/Kconfig | 17 ++ > mm/Makefile | 1 + > mm/cleancache.c | 98 +++----- > mm/filemap.c | 2 +- > mm/frontswap.c | 273 ++++++++++++++++++++ > mm/page_io.c | 12 + > mm/swapfile.c | 64 ++++- > mm/truncate.c | 10 +- > 19 files changed, 672 insertions(+), 141 deletions(-) > > ==== > > FURTHER RATIONALE, INFORMATION, AND LINKS: > > In-kernel users (grep for CONFIG_FRONTSWAP): > - drivers/staging/zcache (since 2.6.39) > - drivers/xen/tmem.c (since 3.1) > - drivers/xen/xen-selfballoon.c (since 3.1) > > Users in development in public git trees: > - "RAMster" driver, see ramster branch of > git://oss.oracle.com/git/djm/tmem.git > - KVM port now underway, see: > https://github.com/sashalevin/kvm-tmem/commits/tmem > > History of frontswap code: > - code first written in Dec 2008 > - previously known as "hswap" and "preswap" > - first public posting in Feb 2009 > - first LKML posting on June 19, 2009 > - renamed frontswap, posted on May 28, 2010 > - in linux-next since June 3, 2011 > - incorporated feedback from: (partial list) > Andrew Morton, Jan Beulich, Konrad Wilk, > Jeremy Fitzhardinge, Kamezawa Hiroyuki, > Seth Jennings (IBM) > > Linux kernel distros incorporating frontswap: > - Oracle UEK 2.6.39 Beta: > http://oss.oracle.com/git/?p=linux-2.6-unbreakable-beta.git;a=summary > - OpenSuSE since 11.2 (2009) [see mm/tmem-xen.c] > http://kernel.opensuse.org/cgit/kernel/ > - a popular Gentoo distro > http://forums.gentoo.org/viewtopic-t-862105.html > > Xen distros supporting Linux guests with frontswap: > - Xen hypervisor backend since Xen 4.0 (2009) > http://www.xen.org/files/Xen_4_0_Datasheet.pdf > - OracleVM since 2.2 (2009) > http://twitter.com/#!/Djelibeybi/status/113876514688352256 > > Public visibility for frontswap (as part of transcendent memory): > - presented at OSDI'08, OLS'09, LCA'10, LPC'10, LinuxCon NA 11, Oracle > Open World 2011, two LSF/MM Summits (2010,2011), and three > Xen Summits (2009,2010,2011) > - http://lwn.net/Articles/454795 (current overview) > - http://lwn.net/Articles/386090 (2010) > - http://lwn.net/Articles/340080 (2009)
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