kernel_optimize_test/drivers/xen
Dan Magenheimer 38a1ed4f03 xen: Fix selfballooning and ensure it doesn't go too far
The balloon driver's "current_pages" is very different from
totalram_pages.  Self-ballooning needs to be driven by
the latter.  Also, Committed_AS doesn't account for pages
used by the kernel so:
1) Add totalreserve_pages to Committed_AS for the normal target.
2) Enforce a floor for when there are little or no user-space threads
   using memory (e.g. single-user mode) to avoid OOMs.  The floor
   function includes a "min_usable_mb" tuneable in case we discover
   later that the floor function is still too aggressive in some
   workloads, though likely it will not be needed.

Changes since version 4:
- change floor calculation so that it is not as aggressive; this version
  uses a piecewise linear function similar to minimum_target in the 2.6.18
  balloon driver, but modified to add to totalreserve_pages instead of
  subtract from max_pfn, the 2.6.18 version causes OOMs on recent kernels
  because the kernel has expanded over time
- change safety_margin to min_usable_mb and comment on its use
- since committed_as does NOT include kernel space (and other reserved
  pages), totalreserve_pages is now added to committed_as.  The result is
  less aggressive self-ballooning, but theoretically more appropriate.
Changes since version 3:
- missing include causes compile problem when CONFIG_FRONTSWAP is disabled
- add comments after includes
Changes since version 2:
- missing include causes compile problem only on 32-bit
Changes since version 1:
- tuneable safety margin added

[v5: avi.miller@oracle.com: still too aggressive, seeing some OOMs]
[v4: konrad.wilk@oracle.com: fix compile when CONFIG_FRONTSWAP is disabled]
[v3: guru.anbalagane@oracle.com: fix 32-bit compile]
[v2: konrad.wilk@oracle.com: make safety margin tuneable]
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
[v1: Altered description and added an extra include]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-10-14 12:36:08 -04:00
..
xen-pciback xen/pciback: remove duplicated #include 2011-08-03 14:34:52 -04:00
xenbus xen: Add module alias to autoload backend drivers 2011-06-30 12:15:33 -04:00
xenfs Merge branch 'xen/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 2011-01-20 16:37:28 -08:00
balloon.c xen: add an "highmem" parameter to alloc_xenballooned_pages 2011-09-29 09:56:52 -04:00
biomerge.c xen: define BIOVEC_PHYS_MERGEABLE() 2010-10-18 10:40:28 -04:00
cpu_hotplug.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-12-11 12:18:16 -08:00
events.c xen/pci: Remove 'xen_allocate_pirq_gsi'. 2011-07-11 13:19:33 -04:00
evtchn.c treewide: remove extra semicolons 2011-04-10 17:01:05 +02:00
features.c xen: clean up asm/xen/hypervisor.h 2008-12-16 21:50:31 +01:00
gntalloc.c xen/gntdev,gntalloc: Remove unneeded VM flags 2011-03-09 22:15:28 -05:00
gntdev.c xen/gntdev: Fix sleep-inside-spinlock 2011-10-14 10:02:10 -04:00
grant-table.c xen: modify kernel mappings corresponding to granted pages 2011-09-29 10:32:58 -04:00
Kconfig xen/self-balloon: Add dependency on tmem. 2011-08-03 14:34:57 -04:00
Makefile Merge branch 'stable/xen-pciback-0.6.3' into stable/drivers 2011-07-20 15:33:51 -04:00
manage.c PM: Remove sysdev suspend, resume and shutdown operations 2011-05-11 21:37:15 +02:00
pci.c xen: register xen pci notifier 2010-10-27 18:56:07 +01:00
platform-pci.c xen: no need to delay xen_setup_shutdown_event for hvm guests anymore 2011-02-25 16:43:03 +00:00
swiotlb-xen.c Merge branch 'stable/xen-swiotlb.bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6 2011-06-09 12:52:44 -07:00
sys-hypervisor.c drivers/xen/sys-hypervisor: Cleanup code/data sections definitions 2011-05-19 11:30:41 -04:00
tmem.c xen: prepare tmem shim to handle frontswap 2011-06-17 15:06:20 -06:00
xen-balloon.c xen: tmem: self-ballooning and frontswap-selfshrinking 2011-07-08 12:26:21 -06:00
xen-selfballoon.c xen: Fix selfballooning and ensure it doesn't go too far 2011-10-14 12:36:08 -04:00
xencomm.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00