Badari Pulavarty
f6b3ec238d
[PATCH] madvise(MADV_REMOVE): remove pages from tmpfs shm backing store ...
Here is the patch to implement madvise(MADV_REMOVE) - which frees up a
given range of pages & its associated backing store. Current
implementation supports only shmfs/tmpfs and other filesystems return
-ENOSYS.
"Some app allocates large tmpfs files, then when some task quits and some
client disconnect, some memory can be released. However the only way to
release tmpfs-swap is to MADV_REMOVE". - Andrea Arcangeli
Databases want to use this feature to drop a section of their bufferpool
(shared memory segments) - without writing back to disk/swap space.
This feature is also useful for supporting hot-plug memory on UML.
Concerns raised by Andrew Morton:
- "We have no plan for holepunching! If we _do_ have such a plan (or
might in the future) then what would the API look like? I think
sys_holepunch(fd, start, len), so we should start out with that."
- Using madvise is very weird, because people will ask "why do I need to
mmap my file before I can stick a hole in it?"
- None of the other madvise operations call into the filesystem in this
manner. A broad question is: is this capability an MM operation or a
filesytem operation? truncate, for example, is a filesystem operation
which sometimes has MM side-effects. madvise is an mm operation and with
this patch, it gains FS side-effects, only they're really, really
significant ones."
Comments:
- Andrea suggested the fs operation too but then it's more efficient to
have it as a mm operation with fs side effects, because they don't
immediatly know fd and physical offset of the range. It's possible to
fixup in userland and to use the fs operation but it's more expensive,
the vmas are already in the kernel and we can use them.
Short term plan & Future Direction:
- We seem to need this interface only for shmfs/tmpfs files in the short
term. We have to add hooks into the filesystem for correctness and
completeness. This is what this patch does.
- In the future, plan is to support both fs and mmap apis also. This
also involves (other) filesystem specific functions to be implemented.
- Current patch doesn't support VM_NONLINEAR - which can be addressed in
the future.
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Andrea Arcangeli <andrea@suse.de>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 08:33:22 -08:00
[PATCH] V4L/DVB: (3086c) Whitespaces cleanups part 4
2005-12-12 08:57:44 -08:00
[MMC] Fix protocol errors
2005-11-28 21:00:29 +00:00
[PATCH] mtd onenand driver: reduce stack usage
2005-12-18 16:28:24 -08:00
[NETFILTER]: ctnetlink: Fix dumping of helper name
2006-01-05 12:20:02 -08:00
[NETFILTER]: Add "revision" support to arp_tables and ip6_tables
2005-10-31 16:36:08 -02:00
[NETFILTER]: Remove ARRAY_SIZE duplicate
2005-11-20 21:11:31 -08:00
[NETFILTER]: Export ip6_masked_addrcmp, don't pass IPv6 addresses on stack
2006-01-05 12:21:34 -08:00
[PATCH] knfsd: Fix some minor sign problems in nfsd/xdr
2005-11-07 07:53:48 -08:00
[PATCH] md: complete conversion of md to use kthreads
2005-11-09 07:56:40 -08:00
[PATCH] knfsd: Fix some minor sign problems in nfsd/xdr
2005-11-07 07:53:48 -08:00
[PATCH] acct.h needs jiffies.h
2005-11-13 18:14:17 -08:00
[PATCH] aio: don't ref kioctx after decref in put_ioctx
2005-11-13 18:14:16 -08:00
[ATM]: deregistration removes device from atm_devs list immediately
2005-11-29 16:16:41 -08:00
[SCSI] Convert SCSI mid-layer to scsi_execute_async
2005-12-14 19:03:35 -08:00
[PATCH] cpusets: bitmap and mask remap operators
2005-10-30 17:37:21 -08:00
[FLS64]: generic version
2006-01-03 13:11:06 -08:00
[SCSI] seperate max_sectors from max_hw_sectors
2005-12-15 15:11:40 -08:00
[PATCH] ext3: Fix unmapped buffers in transaction's lists
2005-10-30 17:37:17 -08:00
[IA64] Add __read_mostly support for IA64
2005-12-16 10:52:46 -08:00
[PATCH 1/3] cciss: bug fix for hpacucli
2005-11-18 22:00:17 +01:00
[PATCH] New Omnikey Cardman 4000 driver
2005-11-13 18:14:10 -08:00
[PATCH] Add timestamp field to process events
2005-12-12 08:57:42 -08:00
[DVB]: Add compat ioctl handling.
2005-11-16 00:52:57 -08:00
[PATCH] kbuild: permanently fix kernel configuration include mess
2005-11-06 10:22:04 +01:00
[PATCH] configfs: User-driven configuration filesystem
2006-01-03 11:45:28 -08:00
[CIFS] Reserve upcall IDX value for CIFS with connector header and add
2005-11-10 15:33:38 -08:00
[PATCH] console: Fix compile error
2005-11-07 07:53:52 -08:00
[PATCH] clean up lock_cpu_hotplug() in cpufreq
2005-11-28 14:42:23 -08:00
[CPUFREQ] CPU frequency display in /proc/cpuinfo
2005-12-06 19:35:11 -08:00
[PATCH] cpusets: bitmap and mask remap operators
2005-10-30 17:37:21 -08:00
[PATCH] shared mounts handling: umount
2005-11-07 18:18:11 -08:00
[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
2006-01-03 13:11:21 -08:00
[PATCH] driver core: replace "hotplug" by "uevent"
2006-01-04 16:18:08 -08:00
[PATCH] CONFIG_IA32
2005-10-30 17:37:10 -08:00
[XFS] Add a mechanism for XFS to use the generic quota sync method.
2005-11-03 13:53:34 +11:00
Add definitions for the Dallas DS1742 RTC / non-volatile memory.
2005-11-17 16:23:43 +00:00
Add definitions for the Dallas DS17287 RTC.
2005-11-17 16:23:42 +00:00
[NET]: Don't exclude broadcast addresses from is_multicast_ether_addr()
2006-01-03 15:25:45 -08:00
[PATCH] bnx2: add 5708 support
2005-11-05 21:00:02 -05:00
[PATCH] fbdev: Fix incorrect unaligned access in little-endian machines
2005-12-12 22:31:17 -08:00
[PATCH] reorder struct files_struct
2005-11-13 18:14:10 -08:00
[PATCH] driver core: replace "hotplug" by "uevent"
2006-01-04 16:18:08 -08:00
Revert "[PATCH] fbcon: Add rl (Roman Large) font"
2005-11-12 10:14:02 -08:00
[PATCH] madvise(MADV_REMOVE): remove pages from tmpfs shm backing store
2006-01-06 08:33:22 -08:00
[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
2005-11-09 07:55:57 -08:00
[PATCH] Update email address for Kumar
2005-11-13 18:14:10 -08:00
[PATCH] FUSE: pass file handle in setattr
2005-11-07 07:53:42 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[NETLINK]: Generic netlink family
2005-11-10 02:26:41 +01:00
[BLOCK] Document the READ/WRITE splitup of the disk stats
2005-11-12 10:55:21 +01:00
Fix up GFP_ZONEMASK for GFP_DMA32 usage
2005-11-22 19:39:30 -08:00
[PATCH] m68k: thread_info header cleanup
2005-11-13 18:14:13 -08:00
[PATCH] ide: remove dead code from flagged_taskfile()
2005-11-19 22:17:55 +01:00
[PATCH] mm: ZAP_BLOCK causes redundant work
2005-11-13 18:14:12 -08:00
[PATCH] V4L/DVB: (3151) I2C ID renamed to I2C_DRIVERID_INFRARED
2005-12-12 08:57:45 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[PATCH] ide: cleanup ide_driver_t
2005-12-15 02:20:15 +01:00
include/linux: enclose idr.h in #ifndef
2005-11-08 17:14:08 +01:00
[NET]: Annotate h_proto in struct ethhdr
2005-11-10 13:03:08 -08:00
[PPP]: add PPP MPPE encryption module
2005-11-08 09:40:47 -08:00
[PPPOX]: Fix assignment into const proto_ops.
2006-01-03 13:11:23 -08:00
[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
2005-11-09 07:55:57 -08:00
[PATCH] aio: remove kioctx from mm_struct
2005-11-13 18:14:16 -08:00
[PATCH] inotify: add two inotify_add_watch flags
2005-12-12 08:57:43 -08:00
[PATCH] Input: fix add modalias support build error
2006-01-04 16:18:09 -08:00
[PATCH] m68k: thread_info header cleanup
2005-11-13 18:14:13 -08:00
[PATCH] __deprecated_for_modules: insert_resource
2005-11-07 07:54:07 -08:00
[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
2006-01-03 13:11:21 -08:00
[PATCH] ipmi: use refcount in message handler
2005-11-07 07:53:43 -08:00
[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
2006-01-03 13:11:21 -08:00
[IPV6]: Flag RTF_ANYCAST for anycast routes.
2005-12-21 22:56:42 +09:00
[PATCH] include/linux/irq.h: #include <linux/smp.h>
2005-12-21 14:45:25 -08:00
[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
2005-11-09 07:55:57 -08:00
compat-ioctl.c: fix compile with no CONFIG_JBD
2005-11-22 21:58:37 -08:00
[JFFS2] Clean up trailing white spaces
2005-11-07 14:18:56 +01:00
[JFFS2] Clean up trailing white spaces
2005-11-07 14:18:56 +01:00
[JFFS2] Clean up trailing white spaces
2005-11-07 14:18:56 +01:00
[PATCH] __deprecated_for_modules: panic_timeout
2005-11-07 07:54:08 -08:00
[PATCH] small kernel_stat.h cleanup
2005-11-07 07:53:37 -08:00
[PATCH] Keys: Add LSM hooks for key management [try #3 ]
2005-10-30 17:37:23 -08:00
[PATCH] Keys: Add LSM hooks for key management [try #3 ]
2005-10-30 17:37:23 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[PATCH] kobject_uevent CONFIG_NET=n fix
2006-01-04 16:18:08 -08:00
[PATCH] kprobes: increment kprobe missed count for multiprobes
2005-12-12 08:57:45 -08:00
[PATCH] Add kthread_stop_sem()
2005-10-30 17:37:17 -08:00
Merge branch 'upstream-fixes'
2005-12-13 02:30:04 -05:00
[PATCH] add hlist_replace_rcu()
2005-12-12 08:57:43 -08:00
[PATCH] memory_sysdev_class is static
2005-11-28 14:42:23 -08:00
[PATCH] memory hotplug: sysfs and add/remove functions
2005-10-29 21:40:44 -07:00
[PATCH] cpusets: automatic numa mempolicy rebinding
2005-10-30 17:37:22 -08:00
[PATCH] madvise(MADV_REMOVE): remove pages from tmpfs shm backing store
2006-01-06 08:33:22 -08:00
Fix up GFP_ZONEMASK for GFP_DMA32 usage
2005-11-22 19:39:30 -08:00
[PATCH] modules: fix sparse warning for every MODULE_PARM
2005-10-30 17:37:26 -08:00
[PATCH] unbindable mounts
2005-11-07 18:18:11 -08:00
[PATCH] fat: cleanup and optimization of checksum
2005-10-30 17:37:32 -08:00
[PATCH] n_r3964: fixed usage of HZ; removed bad include
2005-12-24 15:37:00 -08:00
[PATCH] sanitize lookup_hash prototype
2005-11-09 07:56:00 -08:00
[PATCH] making namespace_sem global
2005-11-07 18:18:10 -08:00
[PATCH] nbd: fix TX/RX race condition
2006-01-06 08:33:20 -08:00
[NET]: move struct proto_ops to const
2006-01-03 13:11:15 -08:00
[PATCH] sky2: change netif_rx_schedule_test to __netif_schedule_prep
2005-12-01 02:20:20 -05:00
[NETFILTER]: Add nf_conntrack subsystem.
2005-11-09 16:38:16 -08:00
[NETLINK]: Type-safe netlink messages/attributes interface
2005-11-10 02:26:40 +01:00
NFS: Fix another O_DIRECT race
2005-12-19 23:12:09 -05:00
[PATCH] cpusets: bitmap and mask remap operators
2005-10-30 17:37:21 -08:00
[PATCH] unpaged: unifdefed PageCompound
2005-11-22 09:13:42 -08:00
[PATCH] mm: gfp_noreclaim cleanup
2005-11-13 18:14:12 -08:00
[PATCH] broken cast in parport_pc
2005-12-12 08:57:45 -08:00
[PATCH] pciehp: request control of each hotplug controller individually
2005-11-10 16:09:15 -08:00
[PATCH] PCI: removed unneeded .owner field from struct pci_driver
2005-11-10 16:09:17 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/perex/alsa
2006-01-04 16:38:36 -08:00
[PATCH] Shut up per_cpu_ptr() on UP
2005-11-13 18:14:15 -08:00
[LSM-IPSec]: Security association restriction.
2006-01-03 13:10:24 -08:00
[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
2005-11-09 07:55:57 -08:00
[PATCH] phy address mask support for generic phy layer
2005-11-05 14:40:55 -05:00
[PKT_SCHED] netem: packet corruption option
2006-01-03 13:11:05 -08:00
[PATCH] Driver Core: Add platform_device_del()
2006-01-04 16:18:09 -08:00
[PATCH] move pm_register/etc. to CONFIG_PM_LEGACY, pm_legacy.h
2005-11-13 18:14:10 -08:00
[PATCH] move pm_register/etc. to CONFIG_PM_LEGACY, pm_legacy.h
2005-11-13 18:14:10 -08:00
[ALSA] [PATCH] alsa: Improved PnP suspend support
2006-01-03 12:31:30 +01:00
[PPP]: add PPP MPPE encryption module
2005-11-08 09:40:47 -08:00
[PATCH] fix race with preempt_enable()
2005-12-22 09:17:39 -08:00
[PATCH] Fix sysctl unregistration oops (CVE-2005-2709)
2005-11-08 17:57:30 -08:00
[PATCH] consolidate sys_ptrace()
2005-11-07 07:53:42 -08:00
[PATCH] saner handling of auto_acct_off() and DQUOT_OFF() in umount
2005-11-07 18:18:09 -08:00
[PATCH] quota: small cleanups
2005-11-07 07:53:39 -08:00
[PATCH] reiser4: add radix_tree_lookup_slot()
2005-11-07 07:53:37 -08:00
[SCSI] raid class update
2005-11-06 12:32:31 -06:00
[INET6]: Generalise tcp_v6_hash_connect
2006-01-03 13:10:56 -08:00
[PATCH] add rcu_barrier() synchronization point
2005-12-12 08:57:42 -08:00
[PATCH] relayfs: remove warning printk() in relay_switch_subbuf()
2005-12-20 17:33:22 -08:00
[PATCH] rapidio: message interface updates
2005-11-07 07:53:47 -08:00
[PATCH] rapidio: message interface updates
2005-11-07 07:53:47 -08:00
[PATCH] RapidIO support: core includes
2005-11-07 07:53:46 -08:00
[PATCH] rapidio: core updates
2005-11-07 07:53:46 -08:00
[PATCH] temporarily disable swap token on memory pressure
2005-11-28 14:42:25 -08:00
[LIB] reed_solomon: Clean up trailing white spaces
2005-11-07 14:25:38 +01:00
[RTNETLINK]: Fix RTNLGRP definitions in rtnetlink.h
2005-12-19 13:54:44 -08:00
[PATCH] add sem_is_read/write_locked()
2005-10-29 21:40:35 -07:00
[PATCH] Introduce sg_set_buf
2005-10-30 11:14:39 +11:00
[PATCH] clean up lock_cpu_hotplug() in cpufreq
2005-11-28 14:42:23 -08:00
[LSM-IPSec]: Security association restriction.
2006-01-03 13:10:24 -08:00
[PATCH] fix remaining missing includes
2005-11-07 07:53:41 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[SERIAL] Support Au1x00 8250 UARTs using the generic 8250 driver.
2005-11-06 09:07:03 +00:00
[ARM] 3181/1: add PORT_ identifier for Hilscher netx uart
2005-11-28 18:09:44 +00:00
[PATCH] SHM_NORESERVE flags for shmget()
2005-11-07 07:53:37 -08:00
[PATCH] kill sigqueue->lock
2005-10-30 17:37:19 -08:00
[NET]: Speed up __alloc_skb()
2006-01-03 14:06:50 -08:00
[PATCH] mm: rename kmem_cache_s to kmem_cache
2005-11-07 07:53:24 -08:00
Revert "[NET]: Shut up warnings in net/core/flow.c"
2005-11-23 08:44:05 -08:00
[PATCH] m68k: thread_info header cleanup
2005-11-13 18:14:13 -08:00
[NET]: Small cleanup to socket initialization
2006-01-03 13:11:14 -08:00
kbuild: set correct KBUILD_MODNAME when using well known kernel symbols as module names
2005-12-26 00:33:41 +01:00
[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
2005-11-09 07:55:57 -08:00
[PATCH] superhyway: multiple block support and VCR rework
2005-11-07 07:53:28 -08:00
[PATCH] swsusp: rework memory freeing on resume
2005-10-30 17:37:14 -08:00
[PATCH] temporarily disable swap token on memory pressure
2005-11-28 14:42:25 -08:00
[PATCH] unify sys_ptrace prototype
2005-10-30 17:37:20 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6
2006-01-04 18:44:12 -08:00
[IP_SOCKGLUE]: Remove most of the tcp specific calls
2006-01-03 13:10:58 -08:00
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
[PATCH] m68k: convert thread flags to use bit fields
2005-11-13 18:14:14 -08:00
[PATCH] Add getnstimestamp function
2005-12-12 08:57:42 -08:00
[PATCH] add_timer() of a pending timer is illegal
2005-10-30 17:37:21 -08:00
[PATCH] NTP shift_right cleanup
2005-10-30 17:37:18 -08:00
remove pointers to the defunct UDF mailing list
2006-01-03 13:19:13 +01:00
remove pointers to the defunct UDF mailing list
2006-01-03 13:19:13 +01:00
remove pointers to the defunct UDF mailing list
2006-01-03 13:19:13 +01:00
[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
2006-01-03 13:11:21 -08:00
Input: uinput - add UI_SET_SWBIT ioctl
2005-11-20 00:51:33 -05:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6
2006-01-04 18:44:12 -08:00
[PATCH] USB Storage: add alauda support
2006-01-04 13:51:42 -08:00
[PATCH] v4l: 829: fixed user mode compiling
2005-11-09 07:56:23 -08:00
[PATCH] v4l: (943) added secam l video standard
2005-11-13 18:14:18 -08:00
[PATCH] vmalloc_node
2005-10-29 21:40:35 -07:00
[PATCH] fix remaining missing includes
2005-11-07 07:53:41 -08:00
[PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE
2006-01-03 11:45:42 -08:00
[LSM-IPSec]: Security association restriction.
2006-01-03 13:10:24 -08:00
f6b3ec238d