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* Merge branches 'stable/bug.fixes-3.2' and 'stable/mmu.fixes' of ↵Linus Torvalds2011-10-251-4/+63
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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."
| * xen: Fix selfballooning and ensure it doesn't go too farDan Magenheimer2011-10-141-4/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | xen: self-balloon needs module.hRandy Dunlap2011-08-161-0/+1
|/ | | | | | | | | | | | | | | | 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>
* xen/balloon: Fix compile errors - missing header files.Konrad Rzeszutek Wilk2011-07-261-2/+2
| | | | | | | | 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>
* xen: tmem: self-ballooning and frontswap-selfshrinkingDan Magenheimer2011-07-081-0/+485
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>
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