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path: root/drivers/xen/xen-selfballoon.c
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2012-11-15mm: export a function to get vm committed memoryK. Y. Srinivasan
It will be useful to be able to access global memory commitment from device drivers. On the Hyper-V platform, the host has a policy engine to balance the available physical memory amongst all competing virtual machines hosted on a given node. This policy engine is driven by a number of metrics including the memory commitment reported by the guests. The balloon driver for Linux on Hyper-V will use this function to retrieve guest memory commitment. This function is also used in Xen self ballooning code. [akpm@linux-foundation.org: coding-style tweak] Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-21xen: Add selfballoning memory reservation tunable.Jana Saout
Currently, the memory target in the Xen selfballooning driver is mainly driven by the value of "Committed_AS". However, there are cases in which it is desirable to assign additional memory to be available for the kernel, e.g. for local caches (which are not covered by cleancache), e.g. dcache and inode caches. This adds an additional tunable in the selfballooning driver (accessible via sysfs) which allows the user to specify an additional constant amount of memory to be reserved by the selfballoning driver for the local domain. Signed-off-by: Jana Saout <jana@saout.de> Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-03-14xen: constify all instances of "struct attribute_group"Jan Beulich
The functions these get passed to have been taking pointers to const since at least 2.6.16. Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-15xen: fix build breakage in xen-selfballoon.c caused by sysdev conversionGreg Kroah-Hartman
This adds the needed include file for xen-selfballoon.c to fix the build error reported by Stephen Rothwell. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-12-14xen-balloon: convert sysdev_class to a regular subsystemKay Sievers
After all sysdev classes are ported to regular driver core entities, the sysdev implementation will be entirely removed from the kernel. Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-10-25Merge branches 'stable/bug.fixes-3.2' and 'stable/mmu.fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen * 'stable/bug.fixes-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/p2m/debugfs: Make type_name more obvious. xen/p2m/debugfs: Fix potential pointer exception. xen/enlighten: Fix compile warnings and set cx to known value. xen/xenbus: Remove the unnecessary check. xen/irq: If we fail during msi_capability_init return proper error code. xen/events: Don't check the info for NULL as it is already done. xen/events: BUG() when we can't allocate our event->irq array. * 'stable/mmu.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen: Fix selfballooning and ensure it doesn't go too far xen/gntdev: Fix sleep-inside-spinlock xen: modify kernel mappings corresponding to granted pages xen: add an "highmem" parameter to alloc_xenballooned_pages xen/p2m: Use SetPagePrivate and its friends for M2P overrides. xen/p2m: Make debug/xen/mmu/p2m visible again. Revert "xen/debug: WARN_ON when identity PFN has no _PAGE_IOMAP flag set."
2011-10-14xen: Fix selfballooning and ensure it doesn't go too farDan Magenheimer
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>
2011-08-16xen: self-balloon needs module.hRandy Dunlap
Fix build errors (found when CONFIG_SYSFS is not enabled): drivers/xen/xen-selfballoon.c:446: warning: data definition has no type or storage class drivers/xen/xen-selfballoon.c:446: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' drivers/xen/xen-selfballoon.c:446: warning: parameter names (without types) in function declaration drivers/xen/xen-selfballoon.c:485: error: expected declaration specifiers or '...' before string constant drivers/xen/xen-selfballoon.c:485: warning: data definition has no type or storage class drivers/xen/xen-selfballoon.c:485: warning: type defaults to 'int' in declaration of 'MODULE_LICENSE' drivers/xen/xen-selfballoon.c:485: warning: function declaration isn't a prototype Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-07-26xen/balloon: Fix compile errors - missing header files.Konrad Rzeszutek Wilk
With a specific enough .config file compile errors show for missing workqueue declarations. Reported-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-07-08xen: tmem: self-ballooning and frontswap-selfshrinkingDan Magenheimer
This patch introduces two in-kernel drivers for Xen transcendent memory ("tmem") functionality that complement cleancache and frontswap. Both use control theory to dynamically adjust and optimize memory utilization. Selfballooning controls the in-kernel Xen balloon driver, targeting a goal value (vm_committed_as), thus pushing less frequently used clean page cache pages (through the cleancache code) into Xen tmem where Xen can balance needs across all VMs residing on the physical machine. Frontswap-selfshrinking controls the number of pages in frontswap, driving it towards zero (effectively doing a partial swapoff) when in-kernel memory pressure subsides, freeing up RAM for other VMs. More detail is provided in the header comment of xen-selfballooning.c. Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> [v8: konrad.wilk@oracle.com: set default enablement depending on frontswap] [v7: konrad.wilk@oracle.com: fix capitalization and punctuation in comments] [v6: fix frontswap-selfshrinking initialization] [v6: konrad.wilk@oracle.com: fix init pr_infos; add comments about swap] [v5: konrad.wilk@oracle.com: add NULL to attr list; move inits up to decls] [v4: dkiper@net-space.pl: use strict_strtoul plus a few syntactic nits] [v3: konrad.wilk@oracle.com: fix potential divides-by-zero] [v3: konrad.wilk@oracle.com: add many more comments, fix nits] [v2: rebased to linux-3.0-rc1] [v2: Ian.Campbell@citrix.com: reorganize as new file (xen-selfballoon.c)] [v2: dkiper@net-space.pl: proper access to vm_committed_as] [v2: dkiper@net-space.pl: accounting fixes] Cc: Jan Beulich <JBeulich@novell.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: <xen-devel@lists.xensource.com>