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    SubjectRe: [PATCH v21 00/100] Kernel based checkpoint/restart

    Forgot to mention - based on 2.6.34-rc5.

    Oren.

    Oren Laadan wrote:
    > Hi Andrew,
    >
    > Here is the next version of the checkpoint/restart patchset. This
    > version moves portions of checkpoint code closer to where they belong.
    >
    > As a convenience we've collected a rough table of contents showing
    > places to start for some reviewers with limited time and/or scope
    > (see below).
    >
    > Thanks to Jamie, Nick, Andreas, and all who helped review the last few
    > versions, and thanks in advance for comments on this version.
    >
    > We'll be very grateful if this can get a spin in -mm to get some wider
    > testing in the meantime.
    >
    > Thanks,
    >
    > The Checkpoint/Restart developers.
    >
    > ---
    >
    > Linux Checkpoint-Restart:
    > web, wiki: http://www.linux-cr.org
    > bug track: https://www.linux-cr.org/redmine
    >
    > The repositories for the project are in:
    > kernel: http://www.linux-cr.org/git/?p=linux-cr.git;a=summary
    > user tools: http://www.linux-cr.org/git/?p=user-cr.git;a=summary
    > tests suite: http://www.linux-cr.org/git/?p=tests-cr.git;a=summary
    >
    > ---
    >
    > TABLE OF CONTENTS
    >
    > Patches Area/Role
    > -------------------------------------------------------------------------
    > 11,20 Documentation (eclone, c/r)
    > 8-11,21,22,27,28 Syscall gluey bits
    >
    > 12 Arch Maintainers
    > 8,22-24 x86-32/64
    > 9,58,60 s390
    > 10,84-88 powerpc
    >
    > 14,61-63,69,70, Security
    > 71,89-92,
    >
    > 33,34,35 Generic c/r
    > (shared "object" hash, leak detection, deferqueues)
    >
    > 25,27-31 Processes
    > 5-7 fork (eclone)
    > 39-41,45,46 memory
    > 13,18,51,52,54, namespaces
    > 81-83,94
    > 53-57 ipc
    > 64-67 signals
    > 1-4,70,83 pids, pgids, tids, tgids (eclone or pidns)
    > 14,61,62,69 creds, capabilities, uids, gids
    > 71 sockets
    > 76-78 terminals (specifically pty)
    > 27,28,32 futexes (27,28 relate to futex syscalls restart)
    >
    > 39-41,45,46,55 mm (basically process memory)
    >
    > 15-17 Cgroups
    >
    > 71-75,93-99 Networking
    >
    > 19,36-38,42-44, Filesystems (also pseudo-filesystems, anon_inodes)
    > 47-50,63,76-77,
    > 79-82
    >
    > Some patches show up in multiple places because they are functionally
    > related even though they cross Area/Role boundaries. While we've done our
    > best to make the table above comprehensive, it's entirely conceivable that
    > we've neglected a small piece of a largely unrelated patch. Please feel
    > free to point these out to Matt Helsley <matthltc@us.ibm.com> since he's
    > largely responsible for this table.
    >
    > ---
    >
    > CHANGELOG:
    >
    > [2010-Apr-30] v21
    > - Add relevant maintainers/lists as Cc: in patch descriptions
    > - Reorganize code: move checkpoint/* to kernel/checkpoint/*
    > - Reorganize filesystem code into fs/*
    > - Merge files dump/restore into a single patch
    > - Merge mm dump/restore into a single patch
    > - Move utsns c/r code from checkpoint/namespace.c to kernel/utsname*.c
    > - [Matt Helsley] Move the signal c/r changes to kernel/signal.c
    > - Move userns c/r code from to kernel/{user,cred,user_namespace}.c
    > - Assorted fixes to bisectability of patchset
    > - Do not include checkpoint_hdr.h explicitly
    > - Subsystems/modules register shared objects types for c/r
    > - [Serge Hallyn] CONFIG_SECURITY_FILE_CAPABILITIES has been gone awhile
    > - [Dan Smith] Unbreak compiling with CONFIG_CHECKPOINT=n or CONFIG_NET_NS=n
    > - [Dan Smith] Clean up the error path in restore_veth()
    > - [Dan Smith] Fix acquiring socket lock before reading RTNETLINK response
    > - [Dan Smith] Skip down interfaces (v2)
    > - [Dan Smith] Export net checkpoint fns
    > - [Dan Smith] Add CHECKPOINT_NETNS flag
    > - [Dan Smith] Netdev restore function dispatching from a table
    > - [Dan Smith] Comment on controverial determination of "initial netns"
    > - [Dan Smith] Simplify the E2BIG error handling in netdev c/r
    > - [Dan Smith] Remove a redundant check for checkpoint support per-device
    > - [Nathan Lynch] powerpc: fix build break with CONFIG_CHECKPOINT=n
    > - [Matt Helsley] Eventfd: add missing spin locks around eventfd checkpoint
    > - [Matt Helsley] Put file_ops->checkpoint under CONFIG_CHECKPOINT
    > - [Dan Smith] Fix build when CONFIG_INET=n
    > - [Dan Smith] Disable softirqs when taking the socket queue lock
    > - Replace __initcall() with late_initcall()
    > - [Serge Hallyn] Remove [] following individual ops definitions.
    > - [Serge Hallyn] Fix compilation for when CONFIG_USER_NS=y
    > - [Serge Hallyn] handle CONFIG_{SYSVIPC,SYSVIPC,POSIX_MQUEUE}=n
    > - [Serge Hallyn] Remove namespace.o from kernel/checkpoint/Makefile
    > - [Stanislav O. Bezzubtsev] Fix omitted parameter name error
    > - Put file_ops->checkpoint under CONFIG_CHECKPOINT
    > - [Serge] Print out full path of file which crossed mnt_ns
    > - Update Documentation/filesystem/vfs.txt
    > - Restore_obj() to tolerate a preexisting object in the hash
    > - Add ckpt_obj_del() to objhash for handling error conditions
    > - [Serge Hallyn] Replace BUG_ON() in obj_new with error returns
    > - [Matt Helsley] Move CKPT_CTX_ERROR* definitions to first use.
    > - [Nathan Lynch] x86: use task_user_gs to checkpoint gs
    > - Complain if checkpoint_hdr.h included without CONFIG_CHECKPOINT
    > - Introduce kernel_write(), fix kernel_read()
    > - Consolidate ckpt_read/write with kernel_read/write
    > - [Christoffer Dall] Fix trivial bug in ckpt_msg macro
    > - [Serge Hallyn] user/group: address dhowells feedback
    >
    > [2010-Mar-16] v20
    > BUG FIXES (only)
    > - [Serge Hallyn] Fix unlabeled restore case
    > - [Serge Hallyn] Always restore msg_msg label
    > - [Serge Hallyn] Selinux prevents msgrcv on restore message queues?
    > - [Serge Hallyn] save_access_regs for self-checkpoint
    > - [Serge Hallyn] send uses_interp=1 to arch_setup_additional_pages
    > - Fix "scheduling in atomic" while restoring ipc (sem, shm, msg)
    > - Cleanup: no need to restore perm->{id,key,seq}
    > - Fix sysvipc=n compile
    > - Make uts_ns=n compile
    > - Only use arch_setup_additional_pages() if supported by arch
    > - Export key symbols to enable c/r from kernel modules
    > - Avoid crash if incoming object doesn't have .restore
    > - Replace error_sem with an event completion
    > - [Serge Hallyn] Change sysctl and default for unprivileged use
    > - [Nathan Lynch] Use syscall_get_error
    > - Add entry for checkpoint/restart in MAINTAINERS
    >
    > [2010-Feb-19] v19
    > NEW FEATURES
    > - Support for x86-64 architecture
    > - Support for c/r of LSM (smack, selinux)
    > - Support for c/r of task fs_root and pwd
    > - Support for c/r of epoll
    > - Support for c/r of eventfd
    > - Enable C/R while executing over NFS
    > - Preliminary c/r of mounts namespace
    > - Add @logfd argument to sys_{checkpoint,restart} prototypes
    > - Define new api for error and debug logging
    > - Restart to handle checkpoint images lacking {uts,ipc}-ns
    > - Refuse to checkpoint if monitoring directories with dnotify
    > - Refuse to checkpoint if file locks and leases are held
    > - Refuse to checkpoint files with f_owner
    > OTHER CHANGES
    > - Rebase to kernel 2.6.33-rc8
    > - Settled version of new sys_eclone()
    > - [Serge Hallyn] Fix potential use-before-set return (vdso)
    > - Update documentation and examples for new syscalls API (doc)
    > - [Liu Alexander] Fix typos (doc)
    > - [Serge Hallyn] Update checkpoint image format (doc)
    > - [Serge Hallyn] Use ckpt_err() to for bad header values
    > - sys_{checkpoint,restart} to use ptregs prototype
    > - Set ctx->errno in do_ckpt_msg() if needed
    > - Fix up headers so we can munge them for use by userspace
    > - Multiple fixes to _ckpt_write_err() and friends
    > - [Matt Helsley] Add cpp definitions for enums
    > - [Serge Hallyn] Add global section container to image format
    > - [Matt Helsley] Fix total byte read/write count for large images
    > - ckpt_read_buf_type() to accept max payload (excludes ckpt_hdr)
    > - [Serge Hallyn] Use ckpt_err() for arch incompatbilities
    > - Introduce walk_task_subtree() to iterate through descendants
    > - Call restore_notify_error for restart (not checkpoint !)
    > - Make kread/kwrite() abort if CKPT_CTX_ERROR is set
    > - [Serge Hallyn] Move init_completion(&ctx->complete) to ctx_alloc
    > - Simplify logic of tracking restarting tasks (->ctx)
    > - Coordinator kills descendants on failure for proper cleanup
    > - Prepare descendants needs PTRACE_MODE_ATTACH permissions
    > - Threads wait for entire thread group before restoring
    > - Add debug process-tree status during restart
    > - Fix handling of bogus pid arg to sys_restart
    > - In reparent_thread() test for PF_RESTARTING on parent
    > - Keep __u32s in even groups for 32-64 bit compatibility
    > - Define ckpt_obj_try_fetch
    > - Disallow zero or negative objref during restart
    > - Check for valid destructor before calling it (deferqueue)
    > - Fix false negative of test for unlinked files at checkpoint
    > - [Serge Hallyn] Rename fs_mnt to root_fs_path
    > - Restore thread/cpu state early
    > - Ensure null-termination of file names read from image
    > - Fix compile warning in restore_open_fname()
    > - Introduce FOLL_DIRTY to follow_page() for "dirty" pages
    > - [Serge Hallyn] Checkpoint saved_auxv as u64s
    > - Export filemap_checkpoint()
    > - [Serge Hallyn] Disallow checkpoint of tasks with aio requests
    > - Fix compilation failure when !CONFIG_CHEKCPOINT (regression)
    > - Expose page write functions
    > - Do not hold mmap_sem while checkpointing vma's
    > - Do not hold mmap_sem when reading memory pages on restart
    > - Move consider_private_page() to mm/memory.c:__get_dirty_page()
    > - [Serge Hallyn] move destroy_mm into mmap.c and remove size check
    > - [Serge Hallyn] fill vdso (syscall32_setup_pages) for TIF_IA32/x86_64
    > - [Serge Hallyn] Fix return value of read_pages_contents()
    > - [Serge Hallyn] Change m_type to long, not int (ipc)
    > - Don't free sma if it's an error on restore
    > - Use task->saves_sigmask and drop task->checkpoint_data
    > - [Serge Hallyn] Handle saved_sigmask at checkpoint
    > - Defer restore of blocked signals mask during restart
    > - Self-restart to tolerate missing PGIDs
    > - [Serge Hallyn] skb->tail can be offset
    > - Export and leverage sock_alloc_file()
    > - [Nathan Lynch] Fix net/checkpoint.c for 64-bit
    > - [Dan Smith] Unify skb read/write functions and handle fragmented buffers
    > - [Dan Smith] Update buffer restore code to match the new format
    > - [Dan Smith] Fix compile issue with CONFIG_CHECKPOINT=n
    > - [Dan Smith] Remove an unnecessary check on socket restart
    > - [Dan Smith] Pass the stored sock->protocol into sock_create() on restore
    > - Relax tcp.window_clamp value in INET restore
    > - Restore gso_type fields on sockets and buffers for proper operation
    > - Fix broken compilation for no-c/r architectures
    > - Return -EBUSY (not BUG_ON) if fd is gone on restart
    > - Fix the chunk size instead of auto-tune (epoll)
    > ARCH: x86 (32,64)
    > - Use PTREGSCALL4 for sys_{checkpoint,restart}
    > - Remove debug-reg support (need to redo with perf_events)
    > - [Serge Hallyn] Support for ia32 (checkpoint, restart)
    > - Split arch/x86/checkpoint.c to generic and 32bit specific parts
    > - sys_{checkpoint,restore} to use ptregs
    > - Allow X86_EFLAGS_RF on restart
    > - [Serge Hallyn] Only allow 'restart' with same bit-ness as image.
    > - Move checkpoint.c from arch/x86/mm->arch/x86/kernel
    > ARCH: s390 [Serge Hallyn]
    > - Define s390x sys_restart wrapper
    > - Fixes to restart-blocks logic and signal path
    > - Fix checkpoint and restart compat wrappers
    > - sys_{checkpoint,restore} to use ptregs
    > - Use simpler test_task_thread to test current ti flags
    > - Fix 31-bit s390 checkpoint/restart wrappers
    > - Update sys_checkpoint (do_sys_checkpoint on all archs)
    > - [Oren Laadan] Move checkpoint.c from arch/s390/mm->arch/s390/kernel
    > ARCH: powerpc [Nathan Lynch]
    > - [Serge Hallyn] Add hook task_has_saved_sigmask()
    > - Warn if full register state unavailable
    > - Fix up checkpoint syscall, tidy restart
    > - [Oren Laadan] Move checkpoint.c from arch/powerpc/{mm->kernel}
    >
    > [2009-Sep-22] v18
    > NEW FEATURES
    > - [Nathan Lynch] Re-introduce powerpc support
    > - Save/restore pseudo-terminals
    > - Save/restore (pty) controlling terminals
    > - Save/restore restore PGIDs
    > - [Dan Smith] Save/restore unix domain sockets
    > - Save/restore FIFOs
    > - Save/restore pending signals
    > - Save/restore rlimits
    > - Save/restore itimers
    > - [Matt Helsley] Handle many non-pseudo file-systems
    > OTHER CHANGES
    > - Rename headerless struct ckpt_hdr_* to struct ckpt_*
    > - [Nathan Lynch] discard const from struct cred * where appropriate
    > - [Serge Hallyn][s390] Set return value for self-checkpoint
    > - Handle kmalloc failure in restore_sem_array()
    > - [IPC] Collect files used by shm objects
    > - [IPC] Use file (not inode) as shared object on checkpoint of shm
    > - More ckpt_write_err()s to give information on checkpoint failure
    > - Adjust format of pipe buffer to include the mandatory pre-header
    > - [LEAKS] Mark the backing file as visited at chekcpoint
    > - Tighten checks on supported vma to checkpoint or restart
    > - [Serge Hallyn] Export filemap_checkpoint() (used for ext4)
    > - Introduce ckpt_collect_file() that also uses file->collect method
    > - Use ckpt_collect_file() instead of ckpt_obj_collect() for files
    > - Fix leak-detection issue in collect_mm() (test for first-time obj)
    > - Invoke set_close_on_exec() unconditionally on restart
    > - [Dan Smith] Export fill_fname() as ckpt_fill_fname()
    > - Interface to pass simple pointers as data with deferqueue
    > - [Dan Smith] Fix ckpt_obj_lookup_add() leak detection logic
    > - Replace EAGAIN with EBUSY where necessary
    > - Introduce CKPT_OBJ_VISITED in leak detection
    > - ckpt_obj_collect() returns objref for new objects, 0 otherwise
    > - Rename ckpt_obj_checkpointed() to ckpt_obj_visited()
    > - Introduce ckpt_obj_visit() to mark objects as visited
    > - Set the CHECKPOINTED flag on objects before calling checkpoint
    > - Introduce ckpt_obj_reserve()
    > - Change ref_drop() to accept a @lastref argument (for cleanup)
    > - Disallow multiple objects with same objref in restart
    > - Allow _ckpt_read_obj_type() to read header only (w/o payload)
    > - Fix leak of ckpt_ctx when restoring zombie tasks
    > - Fix race of prepare_descendant() with an ongoing fork()
    > - Track and report the first error if restart fails
    > - Tighten logic to protect against bogus pids in input
    > - [Matt Helsley] Improve debug output from ckpt_notify_error()
    > - [Nathan Lynch] fix compilation errors with CONFIG_COMPAT=y
    > - Detect error-headers in input data on restart, and abort.
    > - Standard format for checkpoint error strings (and documentation)
    > - [Dan Smith] Add an errno validation function
    > - Add ckpt_read_payload(): read a variable-length object (no header)
    > - Add ckpt_read_string(): same for strings (ensures null-terminated)
    > - Add ckpt_read_consume(): consumes next object without processing
    > - [John Dykstra] Fix no-dot-config-targets pattern in linux/Makefile
    >
    > [2009-Jul-21] v17
    > - Introduce syscall clone_with_pids() to restore original pids
    > - Support threads and zombies
    > - Save/restore task->files
    > - Save/restore task->sighand
    > - Save/restore futex
    > - Save/restore credentials
    > - Introduce PF_RESTARTING to skip notifications on task exit
    > - restart(2) allow caller to ask to freeze tasks after restart
    > - restart(2) isn't idempotent: return -EINTR if interrupted
    > - Improve debugging output handling
    > - Make multi-process restart logic more robust and complete
    > - Correctly select return value for restarting tasks on success
    > - Tighten ptrace test for checkpoint to PTRACE_MODE_ATTACH
    > - Use CHECKPOINTING state for frozen checkpointed tasks
    > - Fix compilation without CONFIG_CHECKPOINT
    > - Fix compilation with CONFIG_COMPAT
    > - Fix headers includes and exports
    > - Leak detection performed in two steps
    > - Detect "inverse" leaks of objects (dis)appearing unexpectedly
    > - Memory: save/restore mm->{flags,def_flags,saved_auxv}
    > - Memory: only collect sub-objects of mm once (leak detection)
    > - Files: validate f_mode after restore
    > - Namespaces: leak detection for nsproxy sub-components
    > - Namespaces: proper restart from namespace(s) without namespace(s)
    > - Save global constants in header instead of per-object
    > - IPC: replace sys_unshare() with create_ipc_ns()
    > - IPC: restore objects in suitable namespace
    > - IPC: correct behavior under !CONFIG_IPC_NS
    > - UTS: save/restore all fields
    > - UTS: replace sys_unshare() with create_uts_ns()
    > - X86_32: sanitize cpu, debug, and segment registers on restart
    > - cgroup_freezer: add CHECKPOINTING state to safeguard checkpoint
    > - cgroup_freezer: add interface to freeze a cgroup (given a task)
    >
    > [2009-May-27] v16
    > - Privilege checks for IPC checkpoint
    > - Fix error string generation during checkpoint
    > - Use kzalloc for header allocation
    > - Restart blocks are arch-independent
    > - Redo pipe c/r using splice
    > - Fixes to s390 arch
    > - Remove powerpc arch (temporary)
    > - Explicitly restore ->nsproxy
    > - All objects in image are precedeed by 'struct ckpt_hdr'
    > - Fix leaks detection (and leaks)
    > - Reorder of patchset
    > - Misc bugs and compilation fixes
    >
    > [2009-Apr-12] v15
    > - Minor fixes
    >
    > [2009-Apr-28] v14
    > - Tested against kernel v2.6.30-rc3 on x86_32.
    > - Refactor files chekpoint to use f_ops (file operations)
    > - Refactor mm/vma to use vma_ops
    > - Explicitly handle VDSO vma (and require compat mode)
    > - Added code to c/r restat-blocks (restart timeout related syscalls)
    > - Added code to c/r namespaces: uts, ipc (with Dan Smith)
    > - Added code to c/r sysvipc (shm, msg, sem)
    > - Support for VM_CLONE shared memory
    > - Added resource leak detection for whole-container checkpoint
    > - Added sysctl gauge to allow unprivileged restart/checkpoint
    > - Improve and simplify the code and logic of shared objects
    > - Rework image format: shared objects appear prior to their use
    > - Merge checkpoint and restart functionality into same files
    > - Massive renaming of functions: prefix "ckpt_" for generics,
    > "checkpoint_" for checkpoint, and "restore_" for restart.
    > - Report checkpoint errors as a valid (string record) in the output
    > - Merged PPC architecture (by Nathan Lunch),
    > - Requires updates to userspace tools too.
    > - Misc nits and bug fixes
    >
    > [2009-Mar-31] v14-rc2
    > - Change along Dave's suggestion to use f_ops->checkpoint() for files
    > - Merge patch simplifying Kconfig, with CONFIG_CHECKPOINT_SUPPORT
    > - Merge support for PPC arch (Nathan Lynch)
    > - Misc cleanups and fixes in response to comments
    >
    > [2009-Mar-20] v14-rc1:
    > - The 'h.parent' field of 'struct cr_hdr' isn't used - discard
    > - Check whether calls to cr_hbuf_get() succeed or fail.
    > - Fixed of pipe c/r code
    > - Prevent deadlock by refusing c/r when a pipe inode == ctx->file inode
    > - Refuse non-self checkpoint if a task isn't frozen
    > - Use unsigned fields in checkpoint headers unless otherwise required
    > - Rename functions in files c/r to better reflect their role
    > - Add support for anonymous shared memory
    > - Merge support for s390 arch (Dan Smith, Serge Hallyn)
    >
    > [2008-Dec-03] v13:
    > - Cleanups of 'struct cr_ctx' - remove unused fields
    > - Misc fixes for comments
    >
    > [2008-Dec-17] v12:
    > - Fix re-alloc/reset of pgarr chain to correctly reuse buffers
    > (empty pgarr are saves in a separate pool chain)
    > - Add a couple of missed calls to cr_hbuf_put()
    > - cr_kwrite/cr_kread() again use vfs_read(), vfs_write() (safer)
    > - Split cr_write/cr_read() to two parts: _cr_write/read() helper
    > - Befriend with sparse: explicit conversion to 'void __user *'
    > - Redrefine 'pr_fmt' ind replace cr_debug() with pr_debug()
    >
    > [2008-Dec-05] v11:
    > - Use contents of 'init->fs->root' instead of pointing to it
    > - Ignore symlinks (there is no such thing as an open symlink)
    > - cr_scan_fds() retries from scratch if it hits size limits
    > - Add missing test for VM_MAYSHARE when dumping memory
    > - Improve documentation about: behavior when tasks aren't fronen,
    > life span of the object hash, references to objects in the hash
    >
    > [2008-Nov-26] v10:
    > - Grab vfs root of container init, rather than current process
    > - Acquire dcache_lock around call to __d_path() in cr_fill_name()
    > - Force end-of-string in cr_read_string() (fix possible DoS)
    > - Introduce cr_write_buffer(), cr_read_buffer() and cr_read_buf_type()
    >
    > [2008-Nov-10] v9:
    > - Support multiple processes c/r
    > - Extend checkpoint header with archtiecture dependent header
    > - Misc bug fixes (see individual changelogs)
    > - Rebase to v2.6.28-rc3.
    >
    > [2008-Oct-29] v8:
    > - Support "external" checkpoint
    > - Include Dave Hansen's 'deny-checkpoint' patch
    > - Split docs in Documentation/checkpoint/..., and improve contents
    >
    > [2008-Oct-17] v7:
    > - Fix save/restore state of FPU
    > - Fix argument given to kunmap_atomic() in memory dump/restore
    >
    > [2008-Oct-07] v6:
    > - Balance all calls to cr_hbuf_get() with matching cr_hbuf_put()
    > (even though it's not really needed)
    > - Add assumptions and what's-missing to documentation
    > - Misc fixes and cleanups
    >
    > [2008-Sep-11] v5:
    > - Config is now 'def_bool n' by default
    > - Improve memory dump/restore code (following Dave Hansen's comments)
    > - Change dump format (and code) to allow chunks of <vaddrs, pages>
    > instead of one long list of each
    > - Fix use of follow_page() to avoid faulting in non-present pages
    > - Memory restore now maps user pages explicitly to copy data into them,
    > instead of reading directly to user space; got rid of mprotect_fixup()
    > - Remove preempt_disable() when restoring debug registers
    > - Rename headers files s/ckpt/checkpoint/
    > - Fix misc bugs in files dump/restore
    > - Fixes and cleanups on some error paths
    > - Fix misc coding style
    >
    > [2008-Sep-09] v4:
    > - Various fixes and clean-ups
    > - Fix calculation of hash table size
    > - Fix header structure alignment
    > - Use stand list_... for cr_pgarr
    >
    > [2008-Aug-29] v3:
    > - Various fixes and clean-ups
    > - Use standard hlist_... for hash table
    > - Better use of standard kmalloc/kfree
    >
    > [2008-Aug-20] v2:
    > - Added Dump and restore of open files (regular and directories)
    > - Added basic handling of shared objects, and improve handling of
    > 'parent tag' concept
    > - Added documentation
    > - Improved ABI, 64bit padding for image data
    > - Improved locking when saving/restoring memory
    > - Added UTS information to header (release, version, machine)
    > - Cleanup extraction of filename from a file pointer
    > - Refactor to allow easier reviewing
    > - Remove requirement for CAPS_SYS_ADMIN until we come up with a
    > security policy (this means that file restore may fail)
    > - Other cleanup and response to comments for v1
    >
    > [2008-Jul-29] v1:
    > - Initial version: support a single task with address space of only
    > private anonymous or file-mapped VMAs; syscalls ignore pid/crid
    > argument and act on current process.
    >
    >


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